ERDDAP > info > ACG_RITS-93_Surveyor_chemistry

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 RITS-93 Aerosol Chemistry data		F   I   M	background			NOAA	ACG_RITS-93_Surveyor_chemistry

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	Size segregated aerosol was collected with a two-stage multijet cascade impactor. The impactor had a grease cup at the inlet that was coated with silicone grease to prevent the bounce of large particles onto the downstream stages. Two stage impactors had 50% aerodynamic cut-off diameters, Daero,50, of 1.1 and 10 um. To attain these size cuts, air flow through all impactors was maintained at 30 lpm. Flow through the impactors was computer-controlled so that aerosol was only collected when the relative wind speed and direction along with measured particle number concentration indicated there was no contamination from the ship's stack. Chemical analysis of the substrates included ion chromatography (inorganic ions). The substrates used in the impactors depended on the chemical species analyzed. Blank levels were determined by placing a substrate in the impactor with no air pulled through it. Blank concentrations were subtracted from sample concentrations. Higher time resolution (< 12 hrs) submicron aerosol samples were collected using a Millipore Fluoropore filter holder downstream of a cyclone with a Daero,50 of 1 um. The Millipore filter has a collection efficiency of 99% or greater for particles with diameters larger than 0.035 um (Liu et al., 1976). Material collected on the filters was extracted by wetting with 1 mL of methanol and then adding 5 mL of distilled deionized water and sonicating for 30 min. Samples were handled in a glove box that was purged with air that had passed through a scrubber containing potassium carbonate, citric acid, and activated charcoal to remove SO2, NH3, and volatile organics, respectively.
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=24
attribute	NC_GLOBAL	Easternmost_Easting	double	-63.066
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	53.194
attribute	NC_GLOBAL	geospatial_lat_min	double	-67.575
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-63.066
attribute	NC_GLOBAL	geospatial_lon_min	double	-149.479
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, altitude, ammonium, atmosphere, atmospheric, chemistry, concentration, data, datetime, dissolved, dissolved nutrients, dry, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, end_time, endpoint, environmental, height, IC_Br_sub1, IC_Ca_sub1, IC_Cl_sub1, IC_K_sub1, IC_Mg_sub1, IC_Na_sub1, IC_NH4_sub1, IC_NO3_sub1, IC_SO4_sub1, identifier, laboratory, latitude, level, longitude, m-3, marine, mass, mass_concentration_of_ammonium_dry_aerosol_particles_in_air, mass_concentration_of_nitrate_dry_aerosol_particles_in_air, mass_concentration_of_sulfate_dry_aerosol_particles_in_air, mean, mid_time, midpoint, n02, nh4, nitrate, no3, noaa, nutrients, optical, optical properties, pacific, particles, particulate, pmel, properties, rits, rits-93, science, sea, so4, station, sulfate, time, total_aerosol_mass_sub1, trajectory, trajectory_id
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	53.194
attribute	NC_GLOBAL	platform	String	Surveyor
attribute	NC_GLOBAL	product_version	String	0
attribute	NC_GLOBAL	project	String	RITS-93
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	-67.575
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
attribute	NC_GLOBAL	subsetVariables	String	trajectory_id, altitude, IC_Br_sub1
attribute	NC_GLOBAL	summary	String	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.
attribute	NC_GLOBAL	time_coverage_end	String	1993-05-06T02:39:00Z
attribute	NC_GLOBAL	time_coverage_start	String	1993-03-23T00:44:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry RITS-93 Aerosol Chemistry data
attribute	NC_GLOBAL	Westernmost_Easting	double	-149.479
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	7.3284744E8, 7.3665594E8
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	21300, 256260
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	-67.575, 53.194
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	-149.479, -63.066
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	mid_time		double
attribute	mid_time	_CoordinateAxisType	String	Time
attribute	mid_time	actual_range	double	7.3286532E8, 7.3669539E8
attribute	mid_time	axis	String	T
attribute	mid_time	comment	String	Midpoint of sampling period
attribute	mid_time	coords	String	time
attribute	mid_time	ioos_category	String	Time
attribute	mid_time	long_name	String	midpoint Datetime UTC
attribute	mid_time	source_name	String	datetime_utc
attribute	mid_time	standard_name	String	time
attribute	mid_time	time_origin	String	01-JAN-1970 00:00:00
attribute	mid_time	time_precision	String	1970-01-01T00:00:00Z
attribute	mid_time	units	String	seconds since 1970-01-01T00:00:00Z
variable	end_time		double
attribute	end_time	_CoordinateAxisType	String	Time
attribute	end_time	actual_range	double	7.328832E8, 7.3673484E8
attribute	end_time	axis	String	T
attribute	end_time	comment	String	End of sampling period
attribute	end_time	coords	String	time
attribute	end_time	ioos_category	String	Time
attribute	end_time	long_name	String	endpoint Datetime UTC
attribute	end_time	source_name	String	datetime_utc
attribute	end_time	standard_name	String	time
attribute	end_time	time_origin	String	01-JAN-1970 00:00:00
attribute	end_time	time_precision	String	1970-01-01T00:00:00Z
attribute	end_time	units	String	seconds since 1970-01-01T00:00:00Z
variable	IC_Cl_sub1		double
attribute	IC_Cl_sub1	actual_range	double	0.0, 0.40258
attribute	IC_Cl_sub1	colorBarMaximum	double	60.0
attribute	IC_Cl_sub1	colorBarMinimum	double	0.0
attribute	IC_Cl_sub1	coords	String	time
attribute	IC_Cl_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_Cl_sub1	ioos_category	String	Unknown
attribute	IC_Cl_sub1	long_name	String	Particulate Cl Concentration for Dp < 1.1 um, ug m-3
attribute	IC_Cl_sub1	source	String	surface observation
attribute	IC_Cl_sub1	units	String	micrograms m-3
attribute	IC_Cl_sub1	valid_max	double	50.0
attribute	IC_Cl_sub1	valid_min	double	0.0
variable	IC_Br_sub1		double
attribute	IC_Br_sub1	actual_range	double	0.0, 0.0
attribute	IC_Br_sub1	coords	String	time
attribute	IC_Br_sub1	ioos_category	String	Unknown
attribute	IC_Br_sub1	long_name	String	Particulate Br Concentration for Dp < 1.1 um, ug m-3
attribute	IC_Br_sub1	source	String	surface observation
attribute	IC_Br_sub1	units	String	micrograms m-3
variable	IC_NO3_sub1		double
attribute	IC_NO3_sub1	actual_range	double	0.0, 0.02901
attribute	IC_NO3_sub1	colorBarMaximum	double	60.0
attribute	IC_NO3_sub1	colorBarMinimum	double	0.0
attribute	IC_NO3_sub1	coords	String	time
attribute	IC_NO3_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_NO3_sub1	ioos_category	String	Dissolved Nutrients
attribute	IC_NO3_sub1	long_name	String	Particulate NO3 Concentration for Dp < 1.1 um, ug m-3
attribute	IC_NO3_sub1	source	String	surface observation
attribute	IC_NO3_sub1	standard_name	String	mass_concentration_of_nitrate_dry_aerosol_particles_in_air
attribute	IC_NO3_sub1	units	String	micrograms m-3
attribute	IC_NO3_sub1	valid_max	double	50.0
attribute	IC_NO3_sub1	valid_min	double	0.0
variable	IC_SO4_sub1		double
attribute	IC_SO4_sub1	actual_range	double	0.00954, 1.6518
attribute	IC_SO4_sub1	colorBarMaximum	double	60.0
attribute	IC_SO4_sub1	colorBarMinimum	double	0.0
attribute	IC_SO4_sub1	coords	String	time
attribute	IC_SO4_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_SO4_sub1	ioos_category	String	Optical Properties
attribute	IC_SO4_sub1	long_name	String	Particulate SO4 Concentration for Dp < 1.1 um, ug m-3
attribute	IC_SO4_sub1	source	String	surface observation
attribute	IC_SO4_sub1	standard_name	String	mass_concentration_of_sulfate_dry_aerosol_particles_in_air
attribute	IC_SO4_sub1	units	String	micrograms m-3
attribute	IC_SO4_sub1	valid_max	double	50.0
attribute	IC_SO4_sub1	valid_min	double	0.0
variable	IC_Na_sub1		double
attribute	IC_Na_sub1	actual_range	double	0.0, 0.36539
attribute	IC_Na_sub1	colorBarMaximum	double	60.0
attribute	IC_Na_sub1	colorBarMinimum	double	0.0
attribute	IC_Na_sub1	coords	String	time
attribute	IC_Na_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_Na_sub1	ioos_category	String	Unknown
attribute	IC_Na_sub1	long_name	String	Particulate Na Concentration for Dp < 1.1 um, ug m-3
attribute	IC_Na_sub1	source	String	surface observation
attribute	IC_Na_sub1	units	String	micrograms m-3
attribute	IC_Na_sub1	valid_max	double	50.0
attribute	IC_Na_sub1	valid_min	double	0.0
variable	IC_NH4_sub1		double
attribute	IC_NH4_sub1	_FillValue	double	NaN
attribute	IC_NH4_sub1	actual_range	double	0.012, 0.23623
attribute	IC_NH4_sub1	colorBarMaximum	double	60.0
attribute	IC_NH4_sub1	colorBarMinimum	double	0.0
attribute	IC_NH4_sub1	coords	String	time
attribute	IC_NH4_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_NH4_sub1	ioos_category	String	Dissolved Nutrients
attribute	IC_NH4_sub1	long_name	String	Particulate NH4 Concentration for Dp < 1.1 um, ug m-3
attribute	IC_NH4_sub1	source	String	surface observation
attribute	IC_NH4_sub1	standard_name	String	mass_concentration_of_ammonium_dry_aerosol_particles_in_air
attribute	IC_NH4_sub1	units	String	micrograms m-3
attribute	IC_NH4_sub1	valid_max	double	50.0
attribute	IC_NH4_sub1	valid_min	double	0.0
variable	IC_K_sub1		double
attribute	IC_K_sub1	actual_range	double	0.0, 0.04097
attribute	IC_K_sub1	colorBarMaximum	double	60.0
attribute	IC_K_sub1	colorBarMinimum	double	0.0
attribute	IC_K_sub1	coords	String	time
attribute	IC_K_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_K_sub1	ioos_category	String	Unknown
attribute	IC_K_sub1	long_name	String	Particulate K Concentration for Dp < 1.1 um, ug m-3
attribute	IC_K_sub1	source	String	surface observation
attribute	IC_K_sub1	units	String	micrograms m-3
attribute	IC_K_sub1	valid_max	double	50.0
attribute	IC_K_sub1	valid_min	double	0.0
variable	IC_Mg_sub1		double
attribute	IC_Mg_sub1	actual_range	double	0.00215, 0.03768
attribute	IC_Mg_sub1	colorBarMaximum	double	60.0
attribute	IC_Mg_sub1	colorBarMinimum	double	0.0
attribute	IC_Mg_sub1	coords	String	time
attribute	IC_Mg_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_Mg_sub1	ioos_category	String	Unknown
attribute	IC_Mg_sub1	long_name	String	Particulate Mg Concentration for Dp < 1.1 um, ug m-3
attribute	IC_Mg_sub1	source	String	surface observation
attribute	IC_Mg_sub1	units	String	micrograms m-3
attribute	IC_Mg_sub1	valid_max	double	50.0
attribute	IC_Mg_sub1	valid_min	double	0.0
variable	IC_Ca_sub1		double
attribute	IC_Ca_sub1	actual_range	double	0.0, 1.17116
attribute	IC_Ca_sub1	colorBarMaximum	double	60.0
attribute	IC_Ca_sub1	colorBarMinimum	double	0.0
attribute	IC_Ca_sub1	coords	String	time
attribute	IC_Ca_sub1	instrument	String	2-stage impactor -- ion chromatographic analysis
attribute	IC_Ca_sub1	ioos_category	String	Unknown
attribute	IC_Ca_sub1	long_name	String	Particulate Ca Concentration for Dp < 1.1 um, ug m-3
attribute	IC_Ca_sub1	source	String	surface observation
attribute	IC_Ca_sub1	units	String	micrograms m-3
attribute	IC_Ca_sub1	valid_max	double	50.0
attribute	IC_Ca_sub1	valid_min	double	0.0
variable	total_aerosol_mass_sub1		double
attribute	total_aerosol_mass_sub1	_FillValue	double	NaN
attribute	total_aerosol_mass_sub1	actual_range	double	0.1671, 5.5909
attribute	total_aerosol_mass_sub1	coords	String	time
attribute	total_aerosol_mass_sub1	instrument	String	2-stage impactor
attribute	total_aerosol_mass_sub1	ioos_category	String	Optical Properties
attribute	total_aerosol_mass_sub1	long_name	String	Particulate Fe Concentration for 1.1 um < Dp < 10 um, ug m-3
attribute	total_aerosol_mass_sub1	source	String	surface observation
attribute	total_aerosol_mass_sub1	units	String	micrograms m-3

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.