ERDDAP > info > ACG_PSI-3_Discoverer_main

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph		files	PMEL Atmospheric Chemistry PSI-3 Aerosol Main Data, 1 min data		F   I   M	background			NOAA	ACG_PSI-3_Discoverer_main

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Trajectory
attribute	NC_GLOBAL	cdm_trajectory_variables	String	trajectory_id
attribute	NC_GLOBAL	comment	String	Navigation and Meteorology: Ancillary navigational and meteorological parameters were routinely measured using GPS, radiometers, and anemometers. Ultrafine Particle Number Concentration (UFCN): Total particle number concentrations for Dp greater than 3 and 12 nm were measured with TSI 3025 and 3760 CPCs, respectively. The ultrafine particle number concentration was then defined as the difference between the number concentration measured with the 3025 and 3760 CPCs. Diffusion driers (Permapure Inc.) were placed upstream of the CPCs to minimize particle diameter changes due to hygroscopic growth to less than 5% (Swietlicki et al., 2008). The use of a diffusion drier also helped prevent the uptake of water in the CPC condenser that results when sampling in the humid marine atmosphere. Chlorophyll: Discrete seawater samples for chlorophyll-a analysis were taken from the ship's seawater pumping system 2 to 6 times per day. Samples were immediately filtered, put into 10 mL of 90% acetone, and frozen. Samples were analyzed with a fluorometer within 3 to 4 days onboard the ship. Depending on the cruise, the fluorometer was calibrated several times during, before, or after the experiment usually with algal chlorophyll 'a' (Sigma Chemical Corp.). The discrete samples were used to calibrate continuous fluorescence measurements of seawater also from the ship's underway seawater pumping system. Ozone: A 1/4'' ID Teflon sample line was used to draw air from the top of the aerosol common sampling mast to the O3 instrument located in the lab container at the base of the mast. The loss of O3 in a Teflon sampling line is approximately 5% per 30 m indicating that losses were negligible (< 3%). At intervals of 1 to 4 days, a charcoal filter was placed in the sampling line for 1 hour to determine a zero which was subtracted from the O3 signal. More details can be found in Johnson et al. (1990). Sampling Inlet: An aerosol sampling mast was mounted on top of an 8 ft (2.44 m) tall shipping container converted to a laboratory. The container was mounted as far forward of the ship's stack as possible to minimize contamination. To maintain nominally isokinetic flow and minimize the loss of supermicron particles, the inlet at the top of the mast was rotated into the relative wind manually. The mast angle was recorded for post-cruise data analysis. Air entered the inlet through a 5 cm diameter hole, passed through an expansion cone, and then into the 20 cm diameter sampling mast. The flow through the mast was 1 m3 min-1. Individual 1.9 cm diameter stainless steel tubes extended into the base of the mast. These were connected to the various aerosol instruments in the laboratory container directly below the mast with carbon-embedded conductive tubing to prevent the loss of particles through static charging. Sample air from the mast was not conditioned, i.e., heated to control RH. Instead, aerosol was sampled at ambient RH (75 +- 9%) although all CPCs (Condensation Particle Counters) had diffusion dryers upstream to reduce the RH of the sample air to less than 30%. Aerosol microphysical properties were measured continuously with periods of contamination, calibration, and downtime removed from the final data set. To avoid contamination by the ship's stack, samples for chemical analysis were collected only when the particle number concentration measured at the top of the mast was less than 1000 cm-3, the relative wind speed was greater than 3 m s-1, and the relative wind direction was forward of the ship's beam.
attribute	NC_GLOBAL	contributor_name	String	Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0
attribute	NC_GLOBAL	creator_email	String	derek.coffman at noaa.gov
attribute	NC_GLOBAL	creator_name	String	Coffman, Derek
attribute	NC_GLOBAL	creator_url	String	https://www.pmel.noaa.gov/
attribute	NC_GLOBAL	dimensions	String	time=3600
attribute	NC_GLOBAL	Easternmost_Easting	double	-122.647
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	49.601
attribute	NC_GLOBAL	geospatial_lat_min	double	47.244
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-122.647
attribute	NC_GLOBAL	geospatial_lon_min	double	-128.959
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	18.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	18.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	up
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.pmel.noaa.gov/acg/data/index.html
attribute	NC_GLOBAL	institution	String	NOAA
attribute	NC_GLOBAL	keywords	String	above, aerosol, air, air_temp, air_temperature, altitude, atmosphere, atmospheric, chemistry, chlorophyll, color, compounds, concentration, contaminants, course, data, datetime, density, diffuse, diffuse_downwelling_shortwave_flux_in_air, direction, downwelling, 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 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, environmental, flux, fraction, ground, heat, heat flux, height, humidity, identifier, insolation, laboratory, latitude, level, longitude, main, marine, mass, mass_concentration_of_chlorophyll_in_sea_water, mean, meteorology, min, mixing, mole, mole_fraction_of_ozone_in_air, noaa, number, number_concentration_of_aerosol_particles_at_stp_in_air, O2, ocean, ocean color, oceans, over, oxygen, ozone, pacific, particle, particles, platform, platform_course, platform_speed_wrt_ground, pmel, practical, psi, psi-3, quality, radiation, ratio, relative, relative_humidity, relative_wind_direction, relative_wind_speed, salinity, science, sea, sea_surface_temperature, sea_water_practical_salinity, seawater, ship, ship_course, ship_speed, shortwave, speed, station, statistics, stp, surface, temperature, time, trajectory, trajectory_id, tropospheric, ufcn, ultrafine, vapor, water, wind, wind_direction, wind_from_direction, wind_speed, winds, wrt
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	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).
attribute	NC_GLOBAL	Northernmost_Northing	double	49.601
attribute	NC_GLOBAL	platform	String	Discoverer
attribute	NC_GLOBAL	product_version	String	0
attribute	NC_GLOBAL	project	String	PSI-3
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	47.244
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
attribute	NC_GLOBAL	subsetVariables	String	trajectory_id, duration, altitude
attribute	NC_GLOBAL	summary	String	Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry PSI-3 Aerosol Main Data - 1 min data. The Pacific Sulfur-Stratus Investigation (PSI) was an interdisciplinary program utilizing ship, aircraft, satellite, and shore-based measurements, to describe the biological, chemical, and physical oceanography; atmospheric gas phase, condensed phase and cloud water chemistry; aerosol size distribution, cloud condensation nuclei population, cloud microphysics, cloud albedo, and meteorology. The goals of these experiments were to measure the concentration of the major sulfur species in both the surface ocean and as a function of altitude above the ocean, to begin quantifying the processes controlling these concentrations, and to develop an understanding of the relationships between the measured parameters. A major goal of PSI-3 was to study the cycling of sulfur in the upper water column.
attribute	NC_GLOBAL	time_coverage_end	String	1991-05-01T05:54:00Z
attribute	NC_GLOBAL	time_coverage_start	String	1991-04-16T06:00:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry PSI-3 Aerosol Main Data, 1 min data
attribute	NC_GLOBAL	Westernmost_Easting	double	-128.959
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	6.717816E8, 6.7307724E8
attribute	time	axis	String	T
attribute	time	comment	String	Start of sampling period
attribute	time	coords	String	time
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Datetime UTC
attribute	time	source_name	String	datetime_utc
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	time_precision	String	1970-01-01T00:00:00Z
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	trajectory_id		String
attribute	trajectory_id	cf_role	String	trajectory_id
attribute	trajectory_id	coords	String	time
attribute	trajectory_id	ioos_category	String	Identifier
attribute	trajectory_id	long_name	String	Trajectory ID
variable	duration		int
attribute	duration	_FillValue	int	2147483647
attribute	duration	actual_range	int	360, 360
attribute	duration	coords	String	time
attribute	duration	ioos_category	String	Time
attribute	duration	long_name	String	Duration
attribute	duration	units	String	second
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	double	47.244, 49.601
attribute	latitude	axis	String	Y
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	coords	String	time
attribute	latitude	instrument	String	GPS
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	source	String	surface observation
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
attribute	latitude	valid_max	double	90.0
attribute	latitude	valid_min	double	-90.0
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	double	-128.959, -122.647
attribute	longitude	axis	String	X
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	coords	String	time
attribute	longitude	instrument	String	GPS
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	source	String	surface observation
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
attribute	longitude	valid_max	double	180.0
attribute	longitude	valid_min	double	-180.0
variable	altitude		double
attribute	altitude	_CoordinateAxisType	String	Height
attribute	altitude	_CoordinateZisPositive	String	up
attribute	altitude	actual_range	double	18.0, 18.0
attribute	altitude	axis	String	Z
attribute	altitude	colorBarMinimum	double	0.0
attribute	altitude	coords	String	time
attribute	altitude	ioos_category	String	Location
attribute	altitude	long_name	String	height above mean sea level
attribute	altitude	positive	String	up
attribute	altitude	standard_name	String	altitude
attribute	altitude	units	String	m
attribute	altitude	valid_min	double	0.0
variable	ship_speed		double
attribute	ship_speed	_FillValue	double	NaN
attribute	ship_speed	actual_range	double	-1.79, 13.31
attribute	ship_speed	colorBarMaximum	double	25.0
attribute	ship_speed	colorBarMinimum	double	0.0
attribute	ship_speed	coords	String	time
attribute	ship_speed	instrument	String	GPS
attribute	ship_speed	ioos_category	String	Unknown
attribute	ship_speed	long_name	String	Ship Speed over Ground
attribute	ship_speed	source	String	surface observation
attribute	ship_speed	standard_name	String	platform_speed_wrt_ground
attribute	ship_speed	units	String	knots
attribute	ship_speed	valid_max	double	20.0
attribute	ship_speed	valid_min	double	0.0
variable	ship_course		double
attribute	ship_course	_FillValue	double	NaN
attribute	ship_course	actual_range	double	0.7, 355.12
attribute	ship_course	colorBarMaximum	double	400.0
attribute	ship_course	colorBarMinimum	double	0.0
attribute	ship_course	coords	String	time
attribute	ship_course	instrument	String	GPS
attribute	ship_course	ioos_category	String	Unknown
attribute	ship_course	long_name	String	Ship Course over Ground
attribute	ship_course	source	String	surface observation
attribute	ship_course	standard_name	String	platform_course
attribute	ship_course	units	String	degree
attribute	ship_course	valid_max	double	360.0
attribute	ship_course	valid_min	double	0.0
variable	air_temp		double
attribute	air_temp	_FillValue	double	NaN
attribute	air_temp	actual_range	double	5.59, 12.24
attribute	air_temp	colorBarMaximum	double	40.0
attribute	air_temp	colorBarMinimum	double	-10.0
attribute	air_temp	coords	String	time
attribute	air_temp	instrument	String	Ship and PMEL sensor
attribute	air_temp	ioos_category	String	Temperature
attribute	air_temp	long_name	String	Air Temperature
attribute	air_temp	source	String	surface observation
attribute	air_temp	standard_name	String	air_temperature
attribute	air_temp	units	String	degree_C
attribute	air_temp	valid_max	double	50.0
attribute	air_temp	valid_min	double	-20.0
variable	rh		double
attribute	rh	_FillValue	double	NaN
attribute	rh	actual_range	double	53.85, 95.43
attribute	rh	colorBarMaximum	double	100.0
attribute	rh	colorBarMinimum	double	0.0
attribute	rh	coords	String	time
attribute	rh	instrument	String	Ship and PMEL Sensors
attribute	rh	ioos_category	String	Meteorology
attribute	rh	long_name	String	Relative Humidity
attribute	rh	source	String	surface observation
attribute	rh	standard_name	String	relative_humidity
attribute	rh	units	String	percent
attribute	rh	valid_max	double	110.0
attribute	rh	valid_min	double	0.0
variable	insolation		double
attribute	insolation	_FillValue	double	NaN
attribute	insolation	actual_range	double	1.12, 952.89
attribute	insolation	colorBarMaximum	double	10.0
attribute	insolation	colorBarMinimum	double	-10.0
attribute	insolation	coords	String	time
attribute	insolation	instrument	String	Epply radiometer 8-48
attribute	insolation	ioos_category	String	Heat Flux
attribute	insolation	long_name	String	Shortwave Flux
attribute	insolation	source	String	surface observation
attribute	insolation	standard_name	String	diffuse_downwelling_shortwave_flux_in_air
attribute	insolation	units	String	W m-2
attribute	insolation	valid_max	double	1500.0
attribute	insolation	valid_min	double	-10.0
variable	wind_speed		double
attribute	wind_speed	_FillValue	double	NaN
attribute	wind_speed	actual_range	double	1.35, 10.72
attribute	wind_speed	colorBarMaximum	double	15.0
attribute	wind_speed	colorBarMinimum	double	0.0
attribute	wind_speed	coords	String	time
attribute	wind_speed	instrument	String	Ship SSSSG IMET wind
attribute	wind_speed	ioos_category	String	Wind
attribute	wind_speed	long_name	String	Wind Speed
attribute	wind_speed	source	String	surface observation
attribute	wind_speed	standard_name	String	wind_speed
attribute	wind_speed	units	String	m s-1
attribute	wind_speed	valid_max	double	50.0
attribute	wind_speed	valid_min	double	0.0
variable	wind_direction		double
attribute	wind_direction	_FillValue	double	NaN
attribute	wind_direction	actual_range	double	0.0, 360.0
attribute	wind_direction	colorBarMaximum	double	360.0
attribute	wind_direction	colorBarMinimum	double	0.0
attribute	wind_direction	coords	String	time
attribute	wind_direction	instrument	String	Ship SSSSG IMET wind
attribute	wind_direction	ioos_category	String	Wind
attribute	wind_direction	long_name	String	Wind Direction
attribute	wind_direction	source	String	surface observation
attribute	wind_direction	standard_name	String	wind_from_direction
attribute	wind_direction	units	String	degree
attribute	wind_direction	valid_max	double	360.0
attribute	wind_direction	valid_min	double	0.0
variable	relative_wind_speed		double
attribute	relative_wind_speed	_FillValue	double	NaN
attribute	relative_wind_speed	actual_range	double	0.43724, 12.6542
attribute	relative_wind_speed	colorBarMaximum	double	15.0
attribute	relative_wind_speed	colorBarMinimum	double	0.0
attribute	relative_wind_speed	coords	String	time
attribute	relative_wind_speed	instrument	String	PMEL WX520 anamometer and ship WX520 anamometer
attribute	relative_wind_speed	ioos_category	String	Wind
attribute	relative_wind_speed	long_name	String	Wind Speed Relative to Ship
attribute	relative_wind_speed	source	String	surface observation
attribute	relative_wind_speed	standard_name	String	wind_speed
attribute	relative_wind_speed	units	String	m s-1
attribute	relative_wind_speed	valid_max	double	50.0
attribute	relative_wind_speed	valid_min	double	0.0
variable	relative_wind_direction		double
attribute	relative_wind_direction	_FillValue	double	NaN
attribute	relative_wind_direction	actual_range	double	-171.35, 163.22
attribute	relative_wind_direction	colorBarMaximum	double	360.0
attribute	relative_wind_direction	colorBarMinimum	double	0.0
attribute	relative_wind_direction	coords	String	time
attribute	relative_wind_direction	instrument	String	PMEL WX520 anamometer and ship WX520 anamometer
attribute	relative_wind_direction	ioos_category	String	Wind
attribute	relative_wind_direction	long_name	String	Wind Direction Relative to Ship
attribute	relative_wind_direction	source	String	surface observation
attribute	relative_wind_direction	standard_name	String	wind_from_direction
attribute	relative_wind_direction	units	String	degree
attribute	relative_wind_direction	valid_max	double	180.0
attribute	relative_wind_direction	valid_min	double	-180.0
variable	ufcn		double
attribute	ufcn	_FillValue	double	NaN
attribute	ufcn	actual_range	double	143.81, 8968.05
attribute	ufcn	colorBarMaximum	double	100.0
attribute	ufcn	colorBarMinimum	double	0.0
attribute	ufcn	coords	String	time
attribute	ufcn	instrument	String	TSI 3785 and TSI 3025A
attribute	ufcn	ioos_category	String	Statistics
attribute	ufcn	long_name	String	Ultrafine particle number concentration
attribute	ufcn	source	String	surface observation
attribute	ufcn	standard_name	String	number_concentration_of_aerosol_particles_at_stp_in_air
attribute	ufcn	units	String	cm-3
attribute	ufcn	valid_max	double	1200000.0
attribute	ufcn	valid_min	double	0.0
variable	sea_surface_temperature		double
attribute	sea_surface_temperature	_FillValue	double	NaN
attribute	sea_surface_temperature	actual_range	double	7.8851, 10.7179
attribute	sea_surface_temperature	colorBarMaximum	double	32.0
attribute	sea_surface_temperature	colorBarMinimum	double	0.0
attribute	sea_surface_temperature	coords	String	time
attribute	sea_surface_temperature	instrument	String	Ship Thermosalinograph
attribute	sea_surface_temperature	ioos_category	String	Temperature
attribute	sea_surface_temperature	long_name	String	Sea Surface Temperature
attribute	sea_surface_temperature	source	String	surface ocean observation
attribute	sea_surface_temperature	standard_name	String	sea_surface_temperature
attribute	sea_surface_temperature	units	String	degree_C
attribute	sea_surface_temperature	valid_max	double	45.0
attribute	sea_surface_temperature	valid_min	double	-10.0
variable	salinity		double
attribute	salinity	_FillValue	double	NaN
attribute	salinity	actual_range	double	28.8373, 32.4767
attribute	salinity	colorBarMaximum	double	37.0
attribute	salinity	colorBarMinimum	double	32.0
attribute	salinity	coords	String	time
attribute	salinity	instrument	String	Ship Thermosalinograph
attribute	salinity	ioos_category	String	Salinity
attribute	salinity	long_name	String	Sea Surface Salinity
attribute	salinity	source	String	surface ocean observation
attribute	salinity	standard_name	String	sea_water_practical_salinity
attribute	salinity	units	String	PSU
attribute	salinity	valid_max	double	45.0
attribute	salinity	valid_min	double	0.0
variable	chlorophyll		double
attribute	chlorophyll	_FillValue	double	NaN
attribute	chlorophyll	actual_range	double	0.2, 16.0
attribute	chlorophyll	colorBarMaximum	double	30.0
attribute	chlorophyll	colorBarMinimum	double	0.03
attribute	chlorophyll	colorBarScale	String	Log
attribute	chlorophyll	coords	String	time
attribute	chlorophyll	instrument	String	PMEL Turner fluorometer and Ship fluorometer
attribute	chlorophyll	ioos_category	String	Ocean Color
attribute	chlorophyll	long_name	String	Sea Surface Chlorophyll
attribute	chlorophyll	source	String	surface ocean observation
attribute	chlorophyll	standard_name	String	mass_concentration_of_chlorophyll_in_sea_water
attribute	chlorophyll	units	String	mg m-3
attribute	chlorophyll	valid_max	double	10.0
attribute	chlorophyll	valid_min	double	0.0
variable	ozone		double
attribute	ozone	_FillValue	double	NaN
attribute	ozone	actual_range	double	18.87, 50.94
attribute	ozone	colorBarMaximum	double	1.0
attribute	ozone	colorBarMinimum	double	0.0
attribute	ozone	coords	String	time
attribute	ozone	instrument	String	TECO 49C
attribute	ozone	ioos_category	String	Contaminants
attribute	ozone	long_name	String	Ozone Mixing Ratio
attribute	ozone	source	String	surface observation
attribute	ozone	standard_name	String	mole_fraction_of_ozone_in_air
attribute	ozone	units	String	ppb
attribute	ozone	valid_max	double	200.0
attribute	ozone	valid_min	double	0.0

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.