OceanSITES Stratus mooring Deep T/S data

Delayed mode salinity data from the Woods Hole Oceanographic Institution (WHOI)-UOP Ocean Reference Station deployed at the Stratus site in 2019 by Robert Weller

cdm_data_type = TimeSeriesProfile
VARIABLES:
site_code (Platform Code)
id (FileName ID)
latitude (degrees_north)
longitude (degrees_east)
time (seconds since 1970-01-01T00:00:00Z)
depth (measurement depth, m)
TEMP (sea water temperature, degree_C)
CNDC (sea water electrical conductivity, S m-1)
PSAL (sea water practical salinity, 1)
PRESS (sea water pressure, dbar)
INST (instrument model)
INST_MFGR (instrument manufacturer)
INST_SeaVoX_L22_code (instrument SeaVoX L22 code)
INST_SN (instrument serial number, 1)
INST_URL (instrument reference URL)
INST_MOUNT (instrument mount)


Oceanographic data collected by the WHOTS project. Location is approx. 100 km north of the island of Oahu, Hawaii. Measured properties: temperature, conductivity, (calculated salinity), and pressure.

cdm_data_type = TimeSeries
VARIABLES:
site_code (Platform Code)
id (FileName ID)
latitude (degrees_north)
longitude (degrees_east)
time (time of measurement, seconds since 1970-01-01T00:00:00Z)
TEMP (In-situ sea water temperature, degree_Celsius)
TEMP_QC (Temperature quality flag)
CNDC (sea water conductivity, Siemens_per_meter)
CNDC_QC (quality flag)
PSAL (sea water salinity, psu)
PSAL_QC (quality flag)
PRES
PRES_QC

Department of Oceanography/University of Hawaii


Observing System Monitoring Center (OSMC) most recent 60 days of data.

cdm_data_type = Point
VARIABLES:
platform_code (WMO id or Ship call sign)
platform_type
country
time (observation date, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
observation_depth
sst (sea surface temperature, Deg C)
atmp (air temperature, Deg C)
ztmp (profile water temperature, Deg C)
zsal (profile salinity, PSU)
slp (sea level pressure, hPa)
windspd (wind speed, m/s)
winddir (wind from direction, Deg true)
clouds (cloud cover, oktas)
dewpoint (dew point temperature, Deg C)
hur (relative humidity)
wvht (sea surface wave significant height, m)
waterlevel_met_res (meteorological residual tidal elevation, m)
waterlevel_wrt_lcd (tidal elevation WRT local chart datum, m)
water_col_ht (water column height, m)


Papa NOAA Surface Ocean CO2 and Ocean Acidification Mooring Time Series

Observations from NOAA's Moored Surface Ocean CO2 Flux and Ocean Acidification Observing Network. Supported by the NOAA Ocean Observing and Monitoring Division, the NOAA Ocean Acidification Program, and over twenty other partners and programs.

cdm_data_type = TimeSeries
VARIABLES:
station_id
longitude (degrees_east)
latitude (degrees_north)
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
SST (Sea Surface Temperature, deg C)
SSS (Sea Surface Salinity, PSU)
pCO2_sw (Partial Pressure of CO2 in Sea Water, uatm)
pCO2_air (uatm)
xCO2_air (ppm)
pH_sw (Sea Water pH)
DOXY (salinity_compensated dissolved oxygen (Âµmol kg-1), PSU)
CHL (fluorescence-based nighttime chlorophyll-a (Âµg l-1) adjusted with the community-established calibration bias of 2 (https://doi.org/10.1002/lom3.10185), ug/l)
NTU (Turbidity (NTU), ntu)


PMEL Atmospheric Chemistry ACE1 Experiment 30 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Southern Hemisphere Aerosol Characterization Experiment 30 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
COG_3070 (Course Over Ground, degrees_T)
SOG_3080 (Speed Over Ground, knots)
AT_3051 (Air Temperature, degree_C)
RH_910 (RELATIVE HUMIDITY (%), percent)
BP_915 (BAROMETRIC PRESSURE (MB), mbar)
Qs_133 (SHORTWAVE RADIATION, W m-2)
RWS_405 (Wind Speed (rel. to ship), m s-1)
RWD_414 (Wind Dir. (rel. to bow), degrees)
WS_404 (Wind Speed, m s-1)
WD_412 (Wind Direction (from), degrees_T)
WU_430 (Zonal Wind, m s-1)
WV_431 (Meridional Wind, m s-1)
O3_1807 (Ozone, ppb)
Rn_1810 (Radon, mBq m-3)
UFCN_1852 (Total Particles Dp>3nm, cm-3)
Rr_962 (Rain Rate, mm/hr)
T_25 (SST (C), C)
S_41 (SALINITY (PSU), PSU)
NO3w_183 (Nitrate in Water, umol/L)
DMSw_1809 (DMSwater, nmol/L)
DMSa_1808 (DMSair, ppt)


PMEL Atmospheric Chemistry ACE1 Experiment 60 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Southern Hemisphere Aerosol Characterization Experiment 60 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
TIM_627 (Julian Days)
AAb_1873 (Aerosol Absorbance, Mm-1)
ASB_1861 (Aerosol Scat Blue, Mm-1)
ASG_1862 (Aerosol Scat Green, Mm-1)
ASR_1863 (Aerosol Scat Red, Mm-1)
SASB_1867 (Submicron AeroScat Blue, Mm-1)
SASG_1868 (Submicron AeroScat Green, Mm-1)
SASR_1869 (Submicron AeroScat Red, Mm-1)


PMEL Atmospheric Chemistry ACE1 Experiment Irregular 1 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Southern Hemisphere Aerosol Characterization Experiment Irregular 1 data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
Na_1920 (Soluble Submicron Aerosol Sodium, ug/m^3)
Na_1921 (Soluble Supermicron Aerosol Sodium, ug/m^3)
NH4_1923 (Soluble Submicron Aerosol Ammonium, ug/m^3)
NH4_1924 (Soluble Supermicron Aerosol Ammonium, ug/m^3)
K_1926 (Soluble Submicron Aerosol Potassium, ug/m^3)
K_1927 (Soluble Supermicron Aerosol Potassium, ug/m^3)
Mg_1929 (Soluble Submicron Aerosol Magnesium, ug/m^3)
Mg_1930 (Soluble Supermicron Aerosol Magnesium, ug/m^3)
Ca_1932 (Soluble Submicron Aerosol Calcium, ug/m^3)
Ca_1933 (Soluble Supermicron Aerosol Calcium, ug/m^3)
MSA_1956 (Soluble Submicron Aerosol Methane Sulfonic Acid, ug/m^3)
MSA_1957 (Soluble Supermicron Aerosol Methane Sulfonic Acid, ug/m^3)
Cl_1944 (Soluble Submicron Aerosol Chloride, ug/m^3)
Cl_1945 (Soluble Supermicron Aerosol Chloride, ug/m^3)
Br_1989 (Soluble Submicron Aerosol Bromide, ug/m^3)
Br_1990 (Soluble Supermicron Aerosol Bromide, ug/m^3)
NO3_1947 (Soluble Submicron Aerosol Nitrate, ug/m^3)
NO3_1948 (Soluble Supermicron Aerosol Nitrate, ug/m^3)
SO4_1950 (Soluble Submicron Aerosol Sulfate, ug/m^3)
SO4_1951 (Soluble Supermicron Aerosol Sulfate, ug/m^3)
nssSO4_1953 (Soluble Submicron Aerosol non-Seasalt Sulfate, PSU)
nssSO4_1954 (Soluble Supermicron Aerosol non-Seasalt Sulfate, PSU)


PMEL Atmospheric Chemistry ACE1 Experiment Irregular 2 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Southern Hemisphere Aerosol Characterization Experiment Irregular 2 data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
TIM_627 (Julian Days)
Chl_933 (Chlorophyll, ug/L)


PMEL Atmospheric Chemistry ACE2 Experiment 30 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Aerosol Characterization Experiment - NE Atlantic Ocean 30 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
COG_3070 (Course Over Ground, degrees_T)
SOG_3080 (Speed Over Ground, knots)
AT_3051 (Air Temperature, degree_C)
RH_910 (RELATIVE HUMIDITY (%), percent)
BP_915 (BAROMETRIC PRESSURE (MB), mbar)
Qs_133 (SHORTWAVE RADIATION, W m-2)
RWS_405 (Wind Speed (rel. to ship), m s-1)
RWD_414 (Wind Dir. (rel. to bow), degrees)
WS_404 (Wind Speed, m s-1)
WD_412 (Wind Direction (from), degrees_T)
WU_430 (Zonal Wind, m s-1)
WV_431 (Meridional Wind, m s-1)
O3_1807 (Ozone, ppb)
Rn_1810 (Radon, mBq m-3)
CN_1851 (Total Particles Dp>12nm, cm-3)
UFCN_1852 (Total Particles Dp>3nm, cm-3)
AAb_1873 (Aerosol Absorbance, Mm-1)
ASB_1861 (Aerosol Scat Blue, Mm-1)
ASG_1862 (Aerosol Scat Green, Mm-1)
... (14 more variables)


PMEL Atmospheric Chemistry ACE2 Experiment Irregular Time 1 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Aerosol Characterization Experiment - NE Atlantic Ocean Irregular Time 1 data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
MSA_1956 (Soluble Submicron Aerosol Methane Sulfonic Acid, ug/m^3)
MSA_1957 (Soluble Supermicron Aerosol Methane Sulfonic Acid, ug/m^3)
Cl_1944 (Soluble Submicron Aerosol Chloride, ug/m^3)
Cl_1945 (Soluble Supermicron Aerosol Chloride, ug/m^3)
Br_1989 (Soluble Submicron Aerosol Bromide, ug/m^3)
Br_1990 (Soluble Supermicron Aerosol Bromide, ug/m^3)
NO3_1947 (Soluble Submicron Aerosol Nitrate, ug/m^3)
NO3_1948 (Soluble Supermicron Aerosol Nitrate, ug/m^3)
SO4_1950 (Soluble Submicron Aerosol Sulfate, ug/m^3)
SO4_1951 (Soluble Supermicron Aerosol Sulfate, ug/m^3)
nssSO4_1953 (Soluble Submicron Aerosol non-Seasalt Sulfate, PSU)
nssSO4_1954 (Soluble Supermicron Aerosol non-Seasalt Sulfate, PSU)
Na_1920 (Soluble Submicron Aerosol Sodium, ug/m^3)
Na_1921 (Soluble Supermicron Aerosol Sodium, ug/m^3)
NH4_1923 (Soluble Submicron Aerosol Ammonium, ug/m^3)
NH4_1924 (Soluble Supermicron Aerosol Ammonium, ug/m^3)
K_1926 (Soluble Submicron Aerosol Potassium, ug/m^3)
K_1927 (Soluble Supermicron Aerosol Potassium, ug/m^3)
Mg_1929 (Soluble Submicron Aerosol Magnesium, ug/m^3)
Mg_1930 (Soluble Supermicron Aerosol Magnesium, ug/m^3)
Ca_1932 (Soluble Submicron Aerosol Calcium, ug/m^3)
Ca_1933 (Soluble Supermicron Aerosol Calcium, ug/m^3)


PMEL Atmospheric Chemistry ACE2 Experiment Irregular Time 2 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Aerosol Characterization Experiment - NE Atlantic Ocean Irregular Time 2 data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
TIM_627 (Julian Days)
Chl_933 (Chlorophyll, ug/L)


PMEL Atmospheric Chemistry ACEASIA Aerosol Chemistry data

The third Aerosol Characterization Experiment (ACE) focused on Asia (ACE-Asia) to study the effects of the aerosol emanating from this region on atmospheric chemistry and climate. The experiment was conducted during the spring (mid-March to mid-April of 2001) to capture outbreaks of Asian dust associated with frontal systems moving eastward through the dust-producing regions. The dust is routinely transported to Korea and Japan, out over the North Pacific, and occasionally as far east as North America. En route over China and coastal regions, the dust aerosol mixes with aerosol derived from industrial, combustion, volcanic, and natural sources. Hence by the time the Asian aerosol has reached the western margin of the Pacific Ocean it is a complex mixture of dust, organics, elemental carbon, sulfates, nitrate, sea salt, and liquid water.

For ACE -Asia,  the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements onboard  the NOAA R/V Ronald H. Brown (RHB).  The RHB left left Honolulu, Hawaii on 15 March  and headed to the ACE-Asia study region.  During the transit across the Pacific, marine air with little influence from continental sources was sampled. Eleven days later on 26 March and 2000 km from the east coast of Japan, RHB encountered continentally influenced air. For the rest of the cruise, air masses heavily impacted by Asian emissions were sampled.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
IC_MSA_sub1 (Particulate MSA Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_MSA_super1 (Particulate MSA Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Cl_sub1 (Particulate Cl Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Cl_super1 (Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
... (31 more variables)


PMEL Atmospheric Chemistry ACEASIA Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry ACEASIA Aerosol Main Data - 1 min data. The third Aerosol Characterization Experiment (ACE) focused on Asia (ACE-Asia) to study the effects of the aerosol emanating from this region on atmospheric chemistry and climate. The experiment was conducted during the spring (mid-March to mid-April of 2001) to capture outbreaks of Asian dust associated with frontal systems moving eastward through the dust-producing regions. The dust is routinely transported to Korea and Japan, out over the North Pacific, and occasionally as far east as North America. En route over China and coastal regions, the dust aerosol mixes with aerosol derived from industrial, combustion, volcanic, and natural sources. Hence by the time the Asian aerosol has reached the western margin of the Pacific Ocean it is a complex mixture of dust, organics, elemental carbon, sulfates, nitrate, sea salt, and liquid water.

For ACE -Asia,  the PMEL Atmospheric Chemistry Group made measurements onboard  the NOAA R/V Ronald H. Brown (RHB).  The RHB left left Honolulu, Hawaii on 15 March  and headed to the ACE-Asia study region.  During the transit across the Pacific, marine air with little influence from continental sources was sampled. Eleven days later on 26 March and 2000 km from the east coast of Japan, RHB encountered continentally influenced air. For the rest of the cruise, air masses heavily impacted by Asian emissions were sampled.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
ship_course (Ship Course over Ground, degree)
air_temp (Air Temperature, degree_C)
rh (Relative Humidity, percent)
baro_pressure (Barometric Pressure, hPa)
... (25 more variables)


PMEL Atmospheric Chemistry ACEASIA Aerosol Size Distribution (APS) data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (13 more variables)


PMEL Atmospheric Chemistry ACEASIA Aerosol Size Distribution (DMPS) data


PMEL Atmospheric Chemistry ACEASIA Aerosol Size Distribution data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (16 more variables)


PMEL Atmospheric Chemistry ACEASIA AOD(4080) data

The third Aerosol Characterization Experiment (ACE) focused on Asia (ACE-Asia) to study the effects of the aerosol emanating from this region on atmospheric chemistry and climate. The experiment was conducted during the spring (mid-March to mid-April of 2001) to capture outbreaks of Asian dust associated with frontal systems moving eastward through the dust-producing regions. The dust is routinely transported to Korea and Japan, out over the North Pacific, and occasionally as far east as North America. En route over China and coastal regions, the dust aerosol mixes with aerosol derived from industrial, combustion, volcanic, and natural sources. Hence by the time the Asian aerosol has reached the western margin of the Pacific Ocean it is a complex mixture of dust, organics, elemental carbon, sulfates, nitrate, sea salt, and liquid water.

For ACE -Asia,  the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements onboard  the NOAA R/V Ronald H. Brown (RHB).  The RHB left left Honolulu, Hawaii on 15 March  and headed to the ACE-Asia study region.  During the transit across the Pacific, marine air with little influence from continental sources was sampled. Eleven days later on 26 March and 2000 km from the east coast of Japan, RHB encountered continentally influenced air. For the rest of the cruise, air masses heavily impacted by Asian emissions were sampled.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
aod_500 (Aerosol Optical Depth at 500nm)
aod_675 (Aerosol Optical Depth at 675nm)
aod_870 (Aerosol Optical Depth at 870nm)


PMEL Atmospheric Chemistry ACEASIA Carbon Chemistry data

The third Aerosol Characterization Experiment (ACE) focused on Asia (ACE-Asia) to study the effects of the aerosol emanating from this region on atmospheric chemistry and climate. The experiment was conducted during the spring (mid-March to mid-April of 2001) to capture outbreaks of Asian dust associated with frontal systems moving eastward through the dust-producing regions. The dust is routinely transported to Korea and Japan, out over the North Pacific, and occasionally as far east as North America. En route over China and coastal regions, the dust aerosol mixes with aerosol derived from industrial, combustion, volcanic, and natural sources. Hence by the time the Asian aerosol has reached the western margin of the Pacific Ocean it is a complex mixture of dust, organics, elemental carbon, sulfates, nitrate, sea salt, and liquid water.

For ACE -Asia,  the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements onboard  the NOAA R/V Ronald H. Brown (RHB).  The RHB left left Honolulu, Hawaii on 15 March  and headed to the ACE-Asia study region.  During the transit across the Pacific, marine air with little influence from continental sources was sampled. Eleven days later on 26 March and 2000 km from the east coast of Japan, RHB encountered continentally influenced air. For the rest of the cruise, air masses heavily impacted by Asian emissions were sampled.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
OC_sub1 (Particulate Organic Carbon Concentration for Dp < 1.1 um, micrograms m-3)
OC_super1 (Particulate Organic Carbon Concentration for 1.1 um < Dp < 10 um, micrograms m-3)
EC_sub1 (Particulate Elemental Carbon Concentration for Dp < 1.1 um, micrograms m-3)
EC_super1 (Particulate Elemental Carbon Concentration for 1.1 um < Dp < 10 um, micrograms m-3)
EC_sub10 (Particulate Elemental Carbon Concentration for Dp < 10 um, micrograms m-3)


PMEL Atmospheric Chemistry ACEASIA DMS data

The third Aerosol Characterization Experiment (ACE) focused on Asia (ACE-Asia) to study the effects of the aerosol emanating from this region on atmospheric chemistry and climate. The experiment was conducted during the spring (mid-March to mid-April of 2001) to capture outbreaks of Asian dust associated with frontal systems moving eastward through the dust-producing regions. The dust is routinely transported to Korea and Japan, out over the North Pacific, and occasionally as far east as North America. En route over China and coastal regions, the dust aerosol mixes with aerosol derived from industrial, combustion, volcanic, and natural sources. Hence by the time the Asian aerosol has reached the western margin of the Pacific Ocean it is a complex mixture of dust, organics, elemental carbon, sulfates, nitrate, sea salt, and liquid water.

For ACE -Asia,  the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements onboard  the NOAA R/V Ronald H. Brown (RHB).  The RHB left left Honolulu, Hawaii on 15 March  and headed to the ACE-Asia study region.  During the transit across the Pacific, marine air with little influence from continental sources was sampled. Eleven days later on 26 March and 2000 km from the east coast of Japan, RHB encountered continentally influenced air. For the rest of the cruise, air masses heavily impacted by Asian emissions were sampled.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
dms_seawater (Seawater DMS concentration, nmol L-1)


PMEL Atmospheric Chemistry AERPINDO99 Experiment 30 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Aerosols 99 and Indian Ocean Experiment 30 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
COG_3070 (Course Over Ground, degrees_T)
SOG_3080 (Speed Over Ground, knots)
AT_3051 (Air Temperature, degree_C)
RH_910 (RELATIVE HUMIDITY (%), percent)
BP_915 (BAROMETRIC PRESSURE (MB), mbar)
Qs_133 (SHORTWAVE RADIATION, W m-2)
RWS_405 (Wind Speed (rel. to ship), m s-1)
RWD_414 (Wind Dir. (rel. to bow), degrees)
WS_404 (Wind Speed, m s-1)
WD_412 (Wind Direction (from), degrees_T)
WU_430 (Zonal Wind, m s-1)
WV_431 (Meridional Wind, m s-1)
Rr_962 (Rain Rate, mm/hr)
CN_1851 (Total Particles Dp>12nm, cm-3)
UFCN_1852 (Total Particles Dp>3nm, cm-3)
O3_1807 (Ozone, ppb)
AAb_1873 (Aerosol Absorbance, Mm-1)
ASB_1861 (Aerosol Scat Blue, Mm-1)
ASG_1862 (Aerosol Scat Green, Mm-1)
... (16 more variables)


PMEL Atmospheric Chemistry AERPINDO99 Experiment Irregular data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Aerosols 99 and Indian Ocean Experiment Irregular data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
MSA_1956 (Soluble Submicron Aerosol Methane Sulfonic Acid, ug/m^3)
MSA_1957 (Soluble Supermicron Aerosol Methane Sulfonic Acid, ug/m^3)
MSA_1958 (Soluble Sub10micron Aerosol Methane Sulfonic Acid, ug/m^3)
Cl_1944 (Soluble Submicron Aerosol Chloride, ug/m^3)
Cl_1945 (Soluble Supermicron Aerosol Chloride, ug/m^3)
Cl_1946 (Soluble Sub10micron Aerosol Chloride, ug/m^3)
NO3_1947 (Soluble Submicron Aerosol Nitrate, ug/m^3)
NO3_1948 (Soluble Supermicron Aerosol Nitrate, ug/m^3)
NO3_1949 (Soluble Sub10micron Aerosol Nitrate, ug/m^3)
SO4_1950 (Soluble Submicron Aerosol Sulfate, ug/m^3)
SO4_1951 (Soluble Supermicron Aerosol Sulfate, ug/m^3)
SO4_1952 (Soluble Sub10micron Aerosol Sulfate, ug/m^3)
nssSO4_1953 (Soluble Submicron Aerosol non-Seasalt Sulfate, PSU)
nssSO4_1954 (Soluble Supermicron Aerosol non-Seasalt Sulfate, PSU)
nssSO4_1955 (Soluble Sub10micron Aerosol non-Seasalt Sulfate, PSU)
Na_1920 (Soluble Submicron Aerosol Sodium, ug/m^3)
Na_1921 (Soluble Supermicron Aerosol Sodium, ug/m^3)
Na_1922 (Soluble Sub10micron Aerosol Sodium, ug/m^3)
NH4_1923 (Soluble Submicron Aerosol Ammonium, ug/m^3)
... (11 more variables)


PMEL Atmospheric Chemistry ATOMIC Aerosol Chemistry data

From early January through mid-February 2020, NOAA is partnering with several universities and other programs to lead the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC). The field study will take place in the tropical North Atlantic east of Barbados and investigate cloud and air-sea interaction processes with the goal of advancing understanding and prediction of U.S. weather and climate. ATOMIC is the U.S. complement to the European field campaign called EUREC4A. This collaborative effort involves a unique combination of ships, piloted and remotely-controlled aircraft, and remotely-controlled ocean vehicles to characterize ocean and atmospheric properties. A suite of instruments will be deployed from NOAA's research ship Ronald H. Brown and WP-3D Orion "Hurricane Hunter" aircraft, and on land.

The focus area of ATOMIC is in the heart of the trade winds and representative of other regions across the global ocean with shallow convective clouds. Some of the Earth's largest ocean eddies (circular currents) also shed into this region from the Amazon and Orinoco Rivers. Conducting the study during winter allows researchers to observe the ocean, air, and clouds in near isolation from hurricane impacts, and to gain better insight into the ocean's involvement in making clouds that affect larger weather and climate patterns.

Improved understanding of air-sea interactions in this region will help advance representations of these processes in NOAA's model forecast systems. This effort will also improve the numerical guidance used to predict weather and climate extremes.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (28 more variables)


PMEL Atmospheric Chemistry ATOMIC Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry ATOMIC Aerosol Main Data - 1 min data. From early January through mid-February 2020, NOAA is partnering with several universities and other programs to lead the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC). The field study will take place in the tropical North Atlantic east of Barbados and investigate cloud and air-sea interaction processes with the goal of advancing understanding and prediction of U.S. weather and climate. ATOMIC is the U.S. complement to the European field campaign called EUREC4A. This collaborative effort involves a unique combination of ships, piloted and remotely-controlled aircraft, and remotely-controlled ocean vehicles to characterize ocean and atmospheric properties. A suite of instruments will be deployed from NOAA's research ship Ronald H. Brown and WP-3D Orion "Hurricane Hunter" aircraft, and on land.

The focus area of ATOMIC is in the heart of the trade winds and representative of other regions across the global ocean with shallow convective clouds. Some of the Earth's largest ocean eddies (circular currents) also shed into this region from the Amazon and Orinoco Rivers. Conducting the study during winter allows researchers to observe the ocean, air, and clouds in near isolation from hurricane impacts, and to gain better insight into the ocean's involvement in making clouds that affect larger weather and climate patterns.

Improved understanding of air-sea interactions in this region will help advance representations of these processes in NOAA's model forecast systems. This effort will also improve the numerical guidance used to predict weather and climate extremes.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
... (46 more variables)


PMEL Atmospheric Chemistry ATOMIC Aerosol Size Distribution (APS) data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (13 more variables)


PMEL Atmospheric Chemistry ATOMIC Aerosol Size Distribution (DMPS) data


PMEL Atmospheric Chemistry ATOMIC Aerosol Size Distribution data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (16 more variables)


PMEL Atmospheric Chemistry ATOMIC AOD data

From early January through mid-February 2020, NOAA is partnering with several universities and other programs to lead the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC). The field study will take place in the tropical North Atlantic east of Barbados and investigate cloud and air-sea interaction processes with the goal of advancing understanding and prediction of U.S. weather and climate. ATOMIC is the U.S. complement to the European field campaign called EUREC4A. This collaborative effort involves a unique combination of ships, piloted and remotely-controlled aircraft, and remotely-controlled ocean vehicles to characterize ocean and atmospheric properties. A suite of instruments will be deployed from NOAA's research ship Ronald H. Brown and WP-3D Orion "Hurricane Hunter" aircraft, and on land.

The focus area of ATOMIC is in the heart of the trade winds and representative of other regions across the global ocean with shallow convective clouds. Some of the Earth's largest ocean eddies (circular currents) also shed into this region from the Amazon and Orinoco Rivers. Conducting the study during winter allows researchers to observe the ocean, air, and clouds in near isolation from hurricane impacts, and to gain better insight into the ocean's involvement in making clouds that affect larger weather and climate patterns.

Improved understanding of air-sea interactions in this region will help advance representations of these processes in NOAA's model forecast systems. This effort will also improve the numerical guidance used to predict weather and climate extremes.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
... (4 more variables)


PMEL Atmospheric Chemistry ATOMIC CCN data

From early January through mid-February 2020, NOAA is partnering with several universities and other programs to lead the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC). The field study will take place in the tropical North Atlantic east of Barbados and investigate cloud and air-sea interaction processes with the goal of advancing understanding and prediction of U.S. weather and climate. ATOMIC is the U.S. complement to the European field campaign called EUREC4A. This collaborative effort involves a unique combination of ships, piloted and remotely-controlled aircraft, and remotely-controlled ocean vehicles to characterize ocean and atmospheric properties. A suite of instruments will be deployed from NOAA's research ship Ronald H. Brown and WP-3D Orion "Hurricane Hunter" aircraft, and on land.

The focus area of ATOMIC is in the heart of the trade winds and representative of other regions across the global ocean with shallow convective clouds. Some of the Earth's largest ocean eddies (circular currents) also shed into this region from the Amazon and Orinoco Rivers. Conducting the study during winter allows researchers to observe the ocean, air, and clouds in near isolation from hurricane impacts, and to gain better insight into the ocean's involvement in making clouds that affect larger weather and climate patterns.

Improved understanding of air-sea interactions in this region will help advance representations of these processes in NOAA's model forecast systems. This effort will also improve the numerical guidance used to predict weather and climate extremes.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ccn_ss (Supersaturation of CCN measurement, percent)
ccn (Cloud Condensation Nuclei Concentration at ccn_ss, cm-3)
ccn_cn_ratio (Ratio of CCN to CN)


PMEL Atmospheric Chemistry ATOMIC Radon data

From early January through mid-February 2020, NOAA is partnering with several universities and other programs to lead the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC). The field study will take place in the tropical North Atlantic east of Barbados and investigate cloud and air-sea interaction processes with the goal of advancing understanding and prediction of U.S. weather and climate. ATOMIC is the U.S. complement to the European field campaign called EUREC4A. This collaborative effort involves a unique combination of ships, piloted and remotely-controlled aircraft, and remotely-controlled ocean vehicles to characterize ocean and atmospheric properties. A suite of instruments will be deployed from NOAA's research ship Ronald H. Brown and WP-3D Orion "Hurricane Hunter" aircraft, and on land.

The focus area of ATOMIC is in the heart of the trade winds and representative of other regions across the global ocean with shallow convective clouds. Some of the Earth's largest ocean eddies (circular currents) also shed into this region from the Amazon and Orinoco Rivers. Conducting the study during winter allows researchers to observe the ocean, air, and clouds in near isolation from hurricane impacts, and to gain better insight into the ocean's involvement in making clouds that affect larger weather and climate patterns.

Improved understanding of air-sea interactions in this region will help advance representations of these processes in NOAA's model forecast systems. This effort will also improve the numerical guidance used to predict weather and climate extremes.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
radon (mBq m-3)


PMEL Atmospheric Chemistry CalNex Aerosol Chemistry data

CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
IC_MSA_sub1 (Particulate MSA Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_MSA_super1 (Particulate MSA Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Cl_sub1 (Particulate Cl Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Cl_super1 (Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Br_sub1 (Particulate Br Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Br_super1 (Particulate Br Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NO3_sub1 (Particulate NO3 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NO3_super1 (Particulate NO3 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_SO4_sub1 (Particulate SO4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_SO4_super1 (Particulate SO4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Oxalate_sub1 (Particulate Oxalate Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Oxalate_super1 (Particulate Oxalate Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Na_sub1 (Particulate Na Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Na_super1 (Particulate Na Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
... (11 more variables)


PMEL Atmospheric Chemistry CalNex Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry CalNex Aerosol Main Data - 1 min data. CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The PMEL Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
ship_course (Ship Course over Ground, degree)
ship_heading (degree)
air_temp (Air Temperature, degree_C)
rh (Relative Humidity, percent)
baro_pressure (Barometric Pressure, hPa)
insolation (Shortwave Flux, W m-2)
rain_rate (MM' 'Hour-1)
wind_speed (m s-1)
wind_direction (degree)
wind_u (east component of the wind, m s-1)
wind_v (north component of the wind, m s-1)
relative_wind_speed (Wind Speed Relative to Ship, m s-1)
relative_wind_direction (Wind Direction Relative to Ship, degree)
cn (Particle number concentration, cm-3)
ufcn (Ultrafine particle number concentration, cm-3)
... (36 more variables)


PMEL Atmospheric Chemistry CalNex Aerosol Size Distribution (APS) data


PMEL Atmospheric Chemistry CalNex Aerosol Size Distribution (DMPS) data


PMEL Atmospheric Chemistry CalNex Aerosol Size Distribution data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (25 more variables)


PMEL Atmospheric Chemistry CalNex AOD data

CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
aod_500 (Aerosol Optical Depth at 500nm)
aod_675 (Aerosol Optical Depth at 675nm)
aod_870 (Aerosol Optical Depth at 870nm)
air_mass (Integrated Air Density Along Solar Ray Path, atm)


PMEL Atmospheric Chemistry CalNex CCN data

CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ccn_ss (Supersaturation of CCN measurement, percent)
ccn (Cloud Condensation Nuclei Concentration at ccn_ss, cm-3)
ccn_cn_ratio (Ratio of CCN to CN)


PMEL Atmospheric Chemistry CalNex DMS data

CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
dms_seawater (Seawater DMS concentration, nmol L-1)


PMEL Atmospheric Chemistry CalNex Radon data

CalNex was a joint project of The California Air Resources Board (CARB), the National Oceanic and Atmospheric Administration (NOAA) and the California Energy Commission (CEC).  This project was a joint field study of atmospheric processes over California and the eastern Pacific coastal region in 2010.  The Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements aboard the R/V Atlantis from May 14 through June 8, 2010.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
radon (mBq m-3)


PMEL Atmospheric Chemistry DYNAMO Aerosol Chemistry data

The Dynamics of the Madden-Julian Oscillation (DYNAMO) field campaign took place in conjunction with the international Cooperative Indian Ocean Experiment on Intraseasonal Variability in the equatorial Indian Ocean during the boreal fall and winter of 2011/2012.  As part of this project the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements of aerosol properties in the atmosphere over  in the Indian Ocean from September 29 to December 8, 2011.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
IC_MSA_sub1 (Particulate MSA Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_MSA_super1 (Particulate MSA Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Cl_sub1 (Particulate Cl Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Cl_super1 (Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NO3_sub1 (Particulate NO3 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NO3_super1 (Particulate NO3 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_SO4_sub1 (Particulate SO4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_SO4_super1 (Particulate SO4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Oxalate_sub1 (Particulate Oxalate Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Oxalate_super1 (Particulate Oxalate Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Na_sub1 (Particulate Na Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Na_super1 (Particulate Na Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NH4_sub1 (Particulate NH4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NH4_super1 (Particulate NH4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
... (6 more variables)


PMEL Atmospheric Chemistry DYNAMO Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry DYNAMO Aerosol Main Data - 1 min data. The Dynamics of the Madden-Julian Oscillation (DYNAMO) field campaign took place in conjunction with the international Cooperative Indian Ocean Experiment on Intraseasonal Variability in the equatorial Indian Ocean during the boreal fall and winter of 2011/2012.  As part of this project the PMEL Atmospheric Chemistry Group made measurements of aerosol properties in the atmosphere over  in the Indian Ocean from September 29 to December 8, 2011.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
ship_course (Ship Course over Ground, degree)
ship_heading (degree)
air_temp (Air Temperature, degree_C)
rh (Relative Humidity, percent)
baro_pressure (Barometric Pressure, hPa)
insolation (Shortwave Flux, W m-2)
rain_rate (MM' 'Hour-1)
wind_speed (m s-1)
wind_direction (degree)
wind_u (east component of the wind, m s-1)
wind_v (north component of the wind, m s-1)
relative_wind_speed (Wind Speed Relative to Ship, m s-1)
relative_wind_direction (Wind Direction Relative to Ship, degree)
cn (Particle number concentration, cm-3)
ufcn (Ultrafine particle number concentration, cm-3)
... (34 more variables)


PMEL Atmospheric Chemistry DYNAMO Aerosol Size Distribution (APS) data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (16 more variables)


PMEL Atmospheric Chemistry DYNAMO Aerosol Size Distribution (DMPS) data


PMEL Atmospheric Chemistry DYNAMO Aerosol Size Distribution data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (19 more variables)


PMEL Atmospheric Chemistry DYNAMO AOD data

The Dynamics of the Madden-Julian Oscillation (DYNAMO) field campaign took place in conjunction with the international Cooperative Indian Ocean Experiment on Intraseasonal Variability in the equatorial Indian Ocean during the boreal fall and winter of 2011/2012.  As part of this project the Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made measurements of aerosol properties in the atmosphere over  in the Indian Ocean from September 29 to December 8, 2011.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
aod_500 (Aerosol Optical Depth at 500nm)
aod_675 (Aerosol Optical Depth at 675nm)
aod_870 (Aerosol Optical Depth at 870nm)
air_mass (Integrated Air Density Along Solar Ray Path, atm)


PMEL Atmospheric Chemistry ICEALOT Aerosol Chemistry data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
IC_MSA_sub1 (Particulate MSA Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_MSA_super1 (Particulate MSA Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Cl_sub1 (Particulate Cl Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Cl_super1 (Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Br_sub1 (Particulate Br Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Br_super1 (Particulate Br Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NO3_sub1 (Particulate NO3 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NO3_super1 (Particulate NO3 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_SO4_sub1 (Particulate SO4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_SO4_super1 (Particulate SO4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Oxalate_sub1 (Particulate Oxalate Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Oxalate_super1 (Particulate Oxalate Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Na_sub1 (Particulate Na Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
... (11 more variables)


PMEL Atmospheric Chemistry ICEALOT Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry ICEALOT Aerosol Main Data - 1 min data. A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  PMEL Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
ship_course (Ship Course over Ground, degree)
ship_heading (degree)
air_temp (Air Temperature, degree_C)
rh (Relative Humidity, percent)
baro_pressure (Barometric Pressure, hPa)
insolation (Shortwave Flux, W m-2)
rain_rate (MM' 'Hour-1)
wind_speed (m s-1)
wind_direction (degree)
wind_u (east component of the wind, m s-1)
wind_v (north component of the wind, m s-1)
relative_wind_speed (Wind Speed Relative to Ship, m s-1)
relative_wind_direction (Wind Direction Relative to Ship, degree)
cn (Particle number concentration, cm-3)
... (33 more variables)


PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (APS) data


PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data


PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution data

Pacific Marine Environmental Laboratory (PMEL) Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (25 more variables)


PMEL Atmospheric Chemistry ICEALOT AOD(3774) data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
aod_500 (Aerosol Optical Depth at 500nm)
aod_675 (Aerosol Optical Depth at 675nm)
air_mass (Integrated Air Density Along Solar Ray Path, atm)


PMEL Atmospheric Chemistry ICEALOT AOD(3803) data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
aod_380 (Aerosol Optical Depth at 380nm)
aod_440 (Aerosol Optical Depth at 440nm)
aod_500 (Aerosol Optical Depth at 500nm)
aod_675 (Aerosol Optical Depth at 675nm)
aod_870 (Aerosol Optical Depth at 870nm)
air_mass (Integrated Air Density Along Solar Ray Path, atm)


PMEL Atmospheric Chemistry ICEALOT AOD(4080) data


PMEL Atmospheric Chemistry ICEALOT CCN data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ccn_ss (Supersaturation of CCN measurement, percent)
ccn (Cloud Condensation Nuclei Concentration at ccn_ss, cm-3)
ccn_cn_ratio (Ratio of CCN to CN)


PMEL Atmospheric Chemistry ICEALOT DMS data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
dms_seawater (Seawater DMS concentration, nmol L-1)


PMEL Atmospheric Chemistry ICEALOT Radon data

A NOAA Contribution for the International Polar Year 2008.

The International Chemistry Experiment in the Arctic Lower  Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program.  Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
radon (mBq m-3)


PMEL Atmospheric Chemistry MAGE92 Experiment 30 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Marine Aerosol and Gas Exchange project (IGAC-MAGE) 30 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
TIM_627 (Julian Days)
COG_3070 (Course Over Ground, degrees_T)
SOG_3080 (Speed Over Ground, knots)
AT_3051 (Air Temperature, degree_C)
RH_910 (RELATIVE HUMIDITY (%), percent)
CN_1851 (Total Particles Dp>12nm, cm-3)
UFCN_1852 (Total Particles Dp>3nm, cm-3)
BP_915 (BAROMETRIC PRESSURE (MB), mbar)
RWS_405 (Wind Speed (rel. to ship), m s-1)
RWD_414 (Wind Dir. (rel. to bow), degrees)
WU_430 (Zonal Wind, m s-1)
WV_431 (Meridional Wind, m s-1)
WS_404 (Wind Speed, m s-1)
WD_412 (Wind Direction (from), degrees_T)
Qs_133 (SHORTWAVE RADIATION, W m-2)
O3_1807 (Ozone, ppb)


PMEL Atmospheric Chemistry MAGE92 Experiment 60 minute data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Marine Aerosol and Gas Exchange project (IGAC-MAGE) 60 minute data

cdm_data_type = Trajectory
VARIABLES:
traj
id (trajectory id)
time (seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
lon360 (longitude 360, degrees_east)
latitude (degrees_north)
DUR_628 (Sample Duration, min)
TIM_627 (Julian Days)
COa_1804 (COair, ppb)
pCOa_1814 (pCOair, micro-atm)
COw_1805 (COwater, nmol/L)
pCOw_1815 (pCOwater, micro-atm)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Chemistry data

The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation resolving key processes controlling marine ecosystems and aerosols that are essential to our understanding of Earth system function and future change.

NAAMES is a five year investigation to resolve key processes controlling ocean system function, their influences on atmospheric aerosols and clouds and their implications for climate. Observations obtained during four, targeted ship and aircraft measurement campaigns, combined with the continuous satellite and in situ ocean sensor records, will enable improved predictive capabilities of Earth system processes and will inform ocean management and assessment of ecosystem change.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
mid_time (midpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
end_time (endpoint Datetime UTC, seconds since 1970-01-01T00:00:00Z)
IC_Cl_sub1 (Particulate Cl Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Cl_super1 (Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NO3_sub1 (Particulate NO3 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NO3_super1 (Particulate NO3 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_SO4_sub1 (Particulate SO4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_SO4_super1 (Particulate SO4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_Na_sub1 (Particulate Na Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_Na_super1 (Particulate Na Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
IC_NH4_sub1 (Particulate NH4 Concentration for Dp < 1.1 um, ug m-3, micrograms m-3)
IC_NH4_super1 (Particulate NH4 Concentration for 1.1 um < Dp < 10 um, ug m-3, micrograms m-3)
... (9 more variables)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Main Data, 1 min data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry NAAMES-1 Aerosol Main Data - 1 min data. The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) is an interdisciplinary investigation resolving key processes controlling marine ecosystems and aerosols that are essential to our understanding of Earth system function and future change.

NAAMES is a five year investigation to resolve key processes controlling ocean system function, their influences on atmospheric aerosols and clouds and their implications for climate. Observations obtained during four, targeted ship and aircraft measurement campaigns, combined with the continuous satellite and in situ ocean sensor records, will enable improved predictive capabilities of Earth system processes and will inform ocean management and assessment of ecosystem change.

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
trajectory_id
duration (second)
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
ship_speed (Ship Speed over Ground, knots)
ship_course (Ship Course over Ground, degree)
ship_heading (degree)
air_temp (Air Temperature, degree_C)
rh (Relative Humidity, percent)
baro_pressure (Barometric Pressure, hPa)
insolation (Shortwave Flux, W m-2)
rain_rate (MM' 'Hour-1)
wind_speed (m s-1)
wind_direction (degree)
wind_u (east component of the wind, m s-1)
... (21 more variables)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (APS), DRY data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (APS) - DRY data

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
diameter_aero (midpoint Diameter(aerodynamic), micrometers)
trajectory_id
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
dNdlogDp (Normalized particle number size distribution (Log-normal), micrometer-1 cm-3)
dlogDp (diameter bin width, micrometer)
dN (Particle number size distribution, cm-3)
dSdlogDp (Normalized particle surface area distribution (Log-normal), micrometer2 micrometer-1 cm-3)
dS (Particle surface area size distribution, micrometer2 cm-3)
dVdlogDp (Normalized Particle volume distribution (Log-normal), micrometer3 micrometer-1 cm-3)
dV (Particle volume size distribution, micrometer3 cm-3)
duration (second)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (APS), RH60 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (APS) - RH60 data. PMEL Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (13 more variables)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (DMPS), DRY data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (DMPS) - DRY data

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
diameter (midpoint Diameter(Stokes), micrometers)
trajectory_id
latitude (degrees_north)
longitude (degrees_east)
altitude (height above mean sea level, m)
dNdlogDp (Normalized particle number size distribution (Log-normal), micrometer-1 cm-3)
dlogDp (diameter bin width, micrometer)
dN (Particle number size distribution, cm-3)
dSdlogDp (Normalized particle surface area distribution (Log-normal), micrometer2 micrometer-1 cm-3)
dS (Particle surface area size distribution, micrometer2 cm-3)
dVdlogDp (Normalized Particle volume distribution (Log-normal), micrometer3 micrometer-1 cm-3)
dV (Particle volume size distribution, micrometer3 cm-3)
duration (second)


PMEL Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (DMPS), RH60 data

Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry NAAMES-1 Aerosol Size Distribution (DMPS) - RH60 data. PMEL Size Distributions

    Aerosol inlet:
Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.

DMPS (datasets denoted by _aerosol_sizedist_dmps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration.

APS (datasets denoted by _aerosol_sizedist_aps_):
One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration.

Merged (datasets denoted by _aerosol_sizedist):
These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions.

All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume.

Additional datasets may be included for a give project that include:
 - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors
 - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations

cdm_data_type = Trajectory
VARIABLES:
time (Datetime UTC, seconds since 1970-01-01T00:00:00Z)
... (13 more variables)