ERDDAP > info > ACG_RITS-93_Surveyor_dms

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 DMS data		F   I   M	background			NOAA	ACG_RITS-93_Surveyor_dms

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	DMS: Air and seawater samples for DMS were analyzed using an automated purge and trap system. Air samples were collected through a Teflon line which ran approximately 60 m from the top of the aerosol sampling mast to the instrument. One hundred mL min-1 of the 4 L min-1 flow were pulled through a KI solution at the instrument to eliminate oxidant interferences (Cooper et al., 1993). The air sample volume ranged from 0.5 to 1.5 L depending on the DMS concentration. Water vapor was removed by passing the flow through a -25degC Teflon tube filled with silanized glass wool. DMS was then trapped in another -25degC Teflon tube filled with Tenax. During the sample trapping period, methylethyl sulfide (MES) was added to the sample stream as an internal standard. At the end of the sampling/purge period, the coolant was pushed away from the trap and the trap was electrically heated. DMS was desorbed onto a DB-1 megabore fused silica column where the sulfur compounds were separated isothermally at 50degC quantified with either a Flame Photo Detector (FPD) or a Sulfur Chemiluminescence Detector (SCD). The instrument was calibrated gravimetrically with calibrated permeation tubes. More details of the analysis can be found in Bates et al. (1998b). Seawater samples for DMS analysis were collected from the ship's seawater pumping system at a depth of approximately 5 m below the ship's waterline. Periodically, a 5 mL water sample was valved from the ship's water line into a Teflon gas stripper. The sample was purged with hydrogen for 5 min. DMS and other sulfur gases in the hydrogen purge gas were collected on the Tenax trap held at -25degC as for the air samples.
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=1113
attribute	NC_GLOBAL	Easternmost_Easting	double	-62.758
attribute	NC_GLOBAL	featureType	String	Trajectory
attribute	NC_GLOBAL	geospatial_lat_max	double	54.511
attribute	NC_GLOBAL	geospatial_lat_min	double	-68.005
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-62.758
attribute	NC_GLOBAL	geospatial_lon_min	double	-149.653
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, altitude, atmosphere, atmospheric, chemistry, concentration, data, datetime, dms, dms_air, dms_seawater, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, identifier, laboratory, latitude, level, longitude, marine, mean, noaa, pacific, pmel, rits, rits-93, science, sea, seawater, station, time, trajectory, trajectory_id, water
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	54.511
attribute	NC_GLOBAL	platform	String	Surveyor
attribute	NC_GLOBAL	product_version	String	1.0
attribute	NC_GLOBAL	project	String	RITS-93
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	-68.005
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	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	1993-05-07T00:30:00Z
attribute	NC_GLOBAL	time_coverage_start	String	1993-03-21T16:30:00Z
attribute	NC_GLOBAL	title	String	PMEL Atmospheric Chemistry RITS-93 DMS data
attribute	NC_GLOBAL	Westernmost_Easting	double	-149.653
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	7.327314E8, 7.367346E8
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	3600, 3600
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	-68.005, 54.511
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	-149.653, -62.758
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	dms_seawater		double
attribute	dms_seawater	_FillValue	double	NaN
attribute	dms_seawater	actual_range	double	0.29, 5.01
attribute	dms_seawater	coords	String	time
attribute	dms_seawater	instrument	String	Custom purge and trap gas chromatograph
attribute	dms_seawater	ioos_category	String	Unknown
attribute	dms_seawater	long_name	String	Seawater DMS concentration
attribute	dms_seawater	source	String	surface ocean observation
attribute	dms_seawater	units	String	nmol L-1
variable	dms_air		double
attribute	dms_air	_FillValue	double	NaN
attribute	dms_air	actual_range	double	9.8, 337.6
attribute	dms_air	coords	String	time
attribute	dms_air	instrument	String	Custom purge and trap gas chromatograph
attribute	dms_air	ioos_category	String	Unknown
attribute	dms_air	long_name	String	Atmospheric DMS concentration
attribute	dms_air	source	String	surface ocean observation
attribute	dms_air	units	String	nmol L-1

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.