The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data
NOAA OAR PMEL
|
Easy Access to PMEL Scientific Data
The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data |
NOAA OAR PMEL |
| Dataset Title: | PMEL Atmospheric Chemistry RITS-93 Aerosol Main Data, 1 min data
|
| Institution: | NOAA (Dataset ID: ACG_RITS-93_Surveyor_main) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Files
| Make a graph
|
Attributes {
s {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 7.326711e+8, 7.367445e+8;
String axis "T";
String comment "Start of sampling period";
String coords "time";
String ioos_category "Time";
String long_name "Datetime UTC";
String source_name "datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
trajectory_id {
String cf_role "trajectory_id";
String coords "time";
String ioos_category "Identifier";
String long_name "Trajectory ID";
}
duration {
Int32 _FillValue 2147483647;
Int32 actual_range 1800, 1800;
String coords "time";
String ioos_category "Time";
String long_name "Duration";
String units "second";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 actual_range -67.997, 54.495;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Latitude";
String source "surface observation";
String standard_name "latitude";
String units "degrees_north";
Float64 valid_max 90.0;
Float64 valid_min -90.0;
}
longitude {
String _CoordinateAxisType "Lon";
Float64 actual_range -149.648, -62.764;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Longitude";
String source "surface observation";
String standard_name "longitude";
String units "degrees_east";
Float64 valid_max 180.0;
Float64 valid_min -180.0;
}
altitude {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "up";
Float64 actual_range 18.0, 18.0;
String axis "Z";
Float64 colorBarMinimum 0.0;
String coords "time";
String ioos_category "Location";
String long_name "height above mean sea level";
String positive "up";
String standard_name "altitude";
String units "m";
Float64 valid_min 0.0;
}
ship_speed {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 19.7;
Float64 colorBarMaximum 25.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "GPS";
String ioos_category "Unknown";
String long_name "Ship Speed over Ground";
String source "surface observation";
String standard_name "platform_speed_wrt_ground";
String units "knots";
Float64 valid_max 20.0;
Float64 valid_min 0.0;
}
ship_course {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 360.0;
Float64 colorBarMaximum 400.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "GPS";
String ioos_category "Unknown";
String long_name "Ship Course over Ground";
String source "surface observation";
String standard_name "platform_course";
String units "degree";
Float64 valid_max 360.0;
Float64 valid_min 0.0;
}
air_temp {
Float64 _FillValue NaN;
Float64 actual_range -9.04, 30.59;
Float64 colorBarMaximum 40.0;
Float64 colorBarMinimum -10.0;
String coords "time";
String instrument "Ship and PMEL sensor";
String ioos_category "Temperature";
String long_name "Air Temperature";
String source "surface observation";
String standard_name "air_temperature";
String units "degree_C";
Float64 valid_max 50.0;
Float64 valid_min -20.0;
}
rh {
Float64 _FillValue NaN;
Float64 actual_range 43.2, 88.3;
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Ship and PMEL Sensors";
String ioos_category "Meteorology";
String long_name "Relative Humidity";
String source "surface observation";
String standard_name "relative_humidity";
String units "percent";
Float64 valid_max 110.0;
Float64 valid_min 0.0;
}
baro_pressure {
Float64 _FillValue NaN;
Float64 actual_range 957.09, 1034.84;
Float64 colorBarMaximum 1050.0;
Float64 colorBarMinimum 950.0;
String coords "time";
String instrument "SHIP and PMEL sensors";
String ioos_category "Pressure";
String long_name "Barometric Pressure";
String source "surface observation";
String standard_name "air_pressure";
String units "hPa";
Float64 valid_max 1050.0;
Float64 valid_min 950.0;
}
insolation {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 947.0;
Float64 colorBarMaximum 10.0;
Float64 colorBarMinimum -10.0;
String coords "time";
String instrument "Epply radiometer 8-48";
String ioos_category "Heat Flux";
String long_name "Shortwave Flux";
String source "surface observation";
String standard_name "diffuse_downwelling_shortwave_flux_in_air";
String units "W m-2";
Float64 valid_max 1500.0;
Float64 valid_min -10.0;
}
wind_speed {
Float64 _FillValue NaN;
Float64 actual_range 0.1, 29.66;
Float64 colorBarMaximum 15.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Ship SSSSG IMET wind";
String ioos_category "Wind";
String long_name "Wind Speed";
String source "surface observation";
String standard_name "wind_speed";
String units "m s-1";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
wind_direction {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 359.0;
Float64 colorBarMaximum 360.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Ship SSSSG IMET wind";
String ioos_category "Wind";
String long_name "Wind Direction";
String source "surface observation";
String standard_name "wind_from_direction";
String units "degree";
Float64 valid_max 360.0;
Float64 valid_min 0.0;
}
wind_u {
Float64 _FillValue NaN;
Float64 actual_range -14.5, 21.1;
Float64 colorBarMaximum 15.0;
Float64 colorBarMinimum -15.0;
String coords "time";
String instrument "Wind to East: Ship SSSSG IMET wind";
String ioos_category "Wind";
String long_name "east component of the wind";
String source "surface observation";
String standard_name "eastward_wind";
String units "m s-1";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
wind_v {
Float64 _FillValue NaN;
Float64 actual_range -15.2, 25.2;
Float64 colorBarMaximum 15.0;
Float64 colorBarMinimum -15.0;
String coords "time";
String instrument "Wind to North: Ship SSSG IMET wind";
String ioos_category "Wind";
String long_name "north component of the wind";
String source "surface observation";
String standard_name "northward_wind";
String units "m s-1";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
relative_wind_speed {
Float64 _FillValue NaN;
Float64 actual_range 0.2, 24.5;
Float64 colorBarMaximum 15.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "PMEL WX520 anamometer and ship WX520 anamometer";
String ioos_category "Wind";
String long_name "Wind Speed Relative to Ship";
String source "surface observation";
String standard_name "wind_speed";
String units "m s-1";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
relative_wind_direction {
Float64 _FillValue NaN;
Float64 actual_range -178.0, 178.0;
Float64 colorBarMaximum 360.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "PMEL WX520 anamometer and ship WX520 anamometer";
String ioos_category "Wind";
String long_name "Wind Direction Relative to Ship";
String source "surface observation";
String standard_name "wind_from_direction";
String units "degree";
Float64 valid_max 180.0;
Float64 valid_min -180.0;
}
ufcn {
Float64 _FillValue NaN;
Float64 actual_range 18.0, 1949.0;
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "TSI 3785 and TSI 3025A";
String ioos_category "Statistics";
String long_name "Ultrafine particle number concentration";
String source "surface observation";
String standard_name "number_concentration_of_aerosol_particles_at_stp_in_air";
String units "cm-3";
Float64 valid_max 1200000.0;
Float64 valid_min 0.0;
}
sea_surface_temperature {
Float64 _FillValue NaN;
Float64 actual_range -0.97, 29.58;
Float64 colorBarMaximum 32.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Ship Thermosalinograph";
String ioos_category "Temperature";
String long_name "Sea Surface Temperature";
String source "surface ocean observation";
String standard_name "sea_surface_temperature";
String units "degree_C";
Float64 valid_max 45.0;
Float64 valid_min -10.0;
}
salinity {
Float64 _FillValue NaN;
Float64 actual_range 29.85, 35.98;
Float64 colorBarMaximum 37.0;
Float64 colorBarMinimum 32.0;
String coords "time";
String instrument "Ship Thermosalinograph";
String ioos_category "Salinity";
String long_name "Sea Surface Salinity";
String source "surface ocean observation";
String standard_name "sea_water_practical_salinity";
String units "PSU";
Float64 valid_max 45.0;
Float64 valid_min 0.0;
}
chlorophyll {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.85;
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
String coords "time";
String instrument "PMEL Turner fluorometer and Ship fluorometer";
String ioos_category "Ocean Color";
String long_name "Sea Surface Chlorophyll";
String source "surface ocean observation";
String standard_name "mass_concentration_of_chlorophyll_in_sea_water";
String units "mg m-3";
Float64 valid_max 10.0;
Float64 valid_min 0.0;
}
ozone {
Float64 _FillValue NaN;
Float64 actual_range 0.9, 65.1;
Float64 colorBarMaximum 1.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "TECO 49C";
String ioos_category "Contaminants";
String long_name "Ozone Mixing Ratio";
String source "surface observation";
String standard_name "mole_fraction_of_ozone_in_air";
String units "ppb";
Float64 valid_max 200.0;
Float64 valid_min 0.0;
}
scatter_450_sub10 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 39.2;
Float64 colorBarMaximum 500.0;
Float64 colorBarMinimum -500.0;
String coords "time";
String instrument "TSI Model 3563 Nephelometer";
String ioos_category "Optical Properties";
String long_name "Aerosol light scattering coefficient for Dp < 10 um at 450 nm, Mm-1";
String source "surface observation";
String standard_name "volume_scattering_coefficient_of_radiative_flux_in_air_due_to_ambient_aerosol_particles";
String units "MM-1";
Float64 valid_max 800.0;
Float64 valid_min 0.0;
}
scatter_550_sub10 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 36.5;
Float64 colorBarMaximum 500.0;
Float64 colorBarMinimum -500.0;
String coords "time";
String instrument "TSI Model 3563 Nephelometer";
String ioos_category "Optical Properties";
String long_name "Aerosol light scattering coefficient for Dp < 10 um at 550 nm, Mm-1";
String source "surface observation";
String standard_name "volume_scattering_coefficient_of_radiative_flux_in_air_due_to_ambient_aerosol_particles";
String units "MM-1";
Float64 valid_max 250.0;
Float64 valid_min 0.0;
}
scatter_700_sub10 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 37.6;
Float64 colorBarMaximum 500.0;
Float64 colorBarMinimum -500.0;
String coords "time";
String instrument "TSI Model 3563 Nephelometer";
String ioos_category "Optical Properties";
String long_name "Aerosol light scattering coefficient for Dp < 10 um at 700 nm, Mm-1";
String source "surface observation";
String standard_name "volume_scattering_coefficient_of_radiative_flux_in_air_due_to_ambient_aerosol_particles";
String units "MM-1";
Float64 valid_max 250.0;
Float64 valid_min 0.0;
}
}
NC_GLOBAL {
String cdm_data_type "Trajectory";
String cdm_trajectory_variables "trajectory_id";
String comment
"Atmospheric Temperature and Humidity:
Atmospheric temperature and dew point were measured with the PMEL Qualimetrics instrument using an RTD for temperature and a LiCl cell for dew point. The sensor was enclosed in an aspirated housing mounted on the railing of Aero van approximately 14 m above sea level.
Barometric Pressure:
Barometric pressure record was taken from the ship's bridge deck weather log of hourly measurements. The ship's barometer was calibrated by the National Weather Service.
Insolation (sunlight):
Sunlight was measured with a model 8-48 Eppley Radiometer (SN 12946) that was mounted on top of the Aero Van (14m asl). There were times when the sampling mast shaded the sensor. These shaded data were not been edited out of the 30 min data record.
Wind:
Winds were measured with the PMEL Weather Measure Skyvane (located on the sampling mast on AeroVan approximately 18 m asl). The wind data were stored as one minute averages. The ship's gyro compass input was used to correct the relative wind to true wind. The wind vector was separated into North and East components and the ship?s velocity vector components (as determined from the GPS record) were subtracted to find the true N and true E components of the wind.
WindD is the true wind direction in compass degrees.
WindS is the true wind speed in m/s.
WindU is the true wind east-west component, wind from the east to the west is positive.
WindV is the true wind north-south component, wind from the south to the north is positive.
RelwindS is a 30 min average of the wind speed (in m/s) relative to the bow of the ship.
RelWindD is a 30 min average of the wind direction relative to the bow of the ship where:
0 wind is dead ahead
+90, wind is coming from the starboard beam
-90, wind is coming from the port beam
Ship's position, course and speed:
The ship's position was obtained from Tony Amos' (U. Texas) GPS and recorded on his data system. Latitude and longitude are given here at even 30 minute intervals with no averaging. For those times when there were no data at the 30 minute point, a value was interpolated from the existing data. The course (compass degrees) and speed (knots) were computed from the differences in position.
Aerosol scattering and total number:
Light scattering by aerosol particles (ScatBlue, ScatGreen, ScatRed) was measured with the UW Civil Engineering Department nephelometer (Bodhaine et al., Atmos. Environ., 25A, p2267-2276, 1991). The instrument was calibrated on the cruise using CO2. The scattering values are in units of x10^-6 m^-1 (inverse Megameters, Mm^-1). CN > 12 nm and CN > 3 nm (UFCN) were measured with PMEL TSI CN counters.
Ozone:
Ozone was measured with a Dasibi 1008 AH ozone analyzer. The analyzer was calibrated to a NIST traceable analyzer at the NOAA-CMDL. One minute averages of the output of the analyzer were recorded on the PMEL data system and plots were made of the raw data. A small portion of the data was deleted (consisting mostly of times that the inlet air was passed through a zero filter - usually when the relative wind was well behind the beam of the ship). After the raw data were cleaned, the calibration function from CMDL (offset and slope) was applied, and 30-minute averages were created.
Sea surface temperature and salinity:
Sea surface temperature and salinity were measured with a SBE-21 #332 thermosalinograph calibrated on 9/5/91. Based on the calibration the measured temperatures were accurate to within 0.004 degrees. The data were recorded on Tony Amos' (U. Texas) data logger system. There were several days of missing data.
Chlorophyll:
Discrete chlorophyll samples were collected twice per day initially and then four times per day on the last 2 weeks of the cruise. The values agreed well with the data of Walter Hebling (SIO). PMEL and SIO had continuous flow fluorometers each operating for part of the cruise. The SIO continuous record (JD80-100) was combined with the PMEL record (JD100-127) for the final data set. The continuous record was calibrated with the discrete samples using a linear regression forced through zero (PMEL - chlorophyll = continuous reading * 0.0185, for SIO - chlorophyll = continuous reading * 0.0181). There was evidence of a diurnal cycle in both the PMEL and SIO continuous records in regions of high chlorophyll. Keeping the sample line dark had no effect on the diurnal cycle. No attempt was made to eliminate the diurnal cycle in the final data reduction since there was no significant difference in the regression analysis using day vs. night samples. Although the solar radiation measurement could have been incorporated in the data reduction to lessen the diurnal cycle in regions of high chlorophyll, the corrections would have induced a diurnal cycle in regions of low chlorophyll.";
String contributor_name "Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov";
String Conventions "COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0";
String creator_email "derek.coffman@noaa.gov";
String creator_name "Coffman, Derek";
String creator_url "https://www.pmel.noaa.gov/";
String dimensions "time=2264";
Float64 Easternmost_Easting -62.764;
String featureType "Trajectory";
Float64 geospatial_lat_max 54.495;
Float64 geospatial_lat_min -67.997;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -62.764;
Float64 geospatial_lon_min -149.648;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 18.0;
Float64 geospatial_vertical_min 18.0;
String geospatial_vertical_positive "up";
String geospatial_vertical_units "m";
String history
"2026-01-23T10:50:37Z (local files)
2026-01-23T10:50:37Z https://data.pmel.noaa.gov/pmel/erddap/tabledap/ACG_RITS-93_Surveyor_main.html";
String infoUrl "https://www.pmel.noaa.gov/acg/data/index.html";
String institution "NOAA";
String keywords "above, aerosol, air, air_pressure, air_temp, air_temperature, altitude, ambient, atmosphere, atmospheric, baro_pressure, barometric, chemistry, chlorophyll, coefficient, color, component, compounds, concentration, contaminants, course, data, datetime, density, diffuse, diffuse_downwelling_shortwave_flux_in_air, direction, downwelling, due, duration, earth, Earth Science > Atmosphere > Air Quality > Tropospheric Ozone, Earth Science > Atmosphere > Altitude > Station Height, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds > Ozone, Earth Science > Atmosphere > Atmospheric Pressure > Atmospheric Pressure Measurements, Earth Science > Atmosphere > Atmospheric Pressure > Sea Level Pressure, Earth Science > Atmosphere > Atmospheric Pressure > Static Pressure, Earth Science > Atmosphere > Atmospheric Radiation > Shortwave Radiation, Earth Science > Atmosphere > Atmospheric Temperature > Air Temperature, Earth Science > Atmosphere > Atmospheric Temperature > Surface Air Temperature, Earth Science > Atmosphere > Atmospheric Water Vapor > Humidity, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, Earth Science > Oceans > Salinity/Density > Salinity, east, eastward, eastward_wind, environmental, flux, fraction, ground, heat, heat flux, height, humidity, identifier, insolation, laboratory, latitude, level, light, longitude, main, marine, mass, mass_concentration_of_chlorophyll_in_sea_water, mean, measurements, meteorology, min, mixing, mm-1, mole, mole_fraction_of_ozone_in_air, noaa, north, northward, northward_wind, number, number_concentration_of_aerosol_particles_at_stp_in_air, O2, ocean, ocean color, oceans, optical, optical properties, over, oxygen, ozone, pacific, particle, particles, platform, platform_course, platform_speed_wrt_ground, pmel, practical, pressure, properties, quality, radiation, radiative, ratio, relative, relative_humidity, relative_wind_direction, relative_wind_speed, rits, rits-93, salinity, scatter_450_sub10, scatter_550_sub10, scatter_700_sub10, scattering, science, sea, sea_surface_temperature, sea_water_practical_salinity, seawater, ship, ship_course, ship_speed, shortwave, speed, static, station, statistics, stp, surface, temperature, time, trajectory, trajectory_id, tropospheric, ufcn, ultrafine, vapor, volume, volume_scattering_coefficient_of_radiative_flux_in_air_due_to_ambient_aerosol_particles, water, wind, wind_direction, wind_from_direction, wind_speed, wind_u, wind_v, winds, wrt";
String keywords_vocabulary "GCMD Science Keywords";
String license "These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0).";
Float64 Northernmost_Northing 54.495;
String platform "Surveyor";
String product_version "1.0";
String project "RITS-93";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -67.997;
String standard_name_vocabulary "CF Standard Name Table v70";
String subsetVariables "trajectory_id, duration, altitude";
String summary
"Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry RITS-93 Aerosol Main Data - 1 min data. The RITS 1993 and RITS 1994 cruises were conducted eight months apart in order to assess regional and seasonal variations in trace gases and aerosols along the long latitudinal transect. Measurements were made of sulfur, carbon and nitrogen gas phase species in the ocean and overlying atmosphere in order to quantify their cycling in the surface ocean and to calculate their emission to the atmosphere. The chemical, physical and radiative properties of atmospheric aerosol particles were measured and related to relate synoptic scale meteorology and air mass sources.
The ship departed Punta Arenas, Chile on 20 March 1993, crossed the Drake Passage to Palmer Station on the Antarctic Peninsula, continued southwest to approximately 67°S, 140°W, and then headed north to 57°N, 140°W, arriving in Seattle on 7 May 1993. The RITS 1994 cruise reversed this track, departing Seattle on 20 November 1993 and arriving in Punta Arenas, Chile on 7 January 1994.";
String time_coverage_end "1993-05-07T03:15:00Z";
String time_coverage_start "1993-03-20T23:45:00Z";
String title "PMEL Atmospheric Chemistry RITS-93 Aerosol Main Data, 1 min data";
Float64 Westernmost_Easting -149.648;
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
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For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.