ERDDAP > info > bcodmo_dataset_555666

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	[nitrogen fixation rates] - 15N2-based N2 fixation rates from the Eastern Tropical South Pacific collected on the R/V Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project) (Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific)		F   I   M	background			BCO-DMO	bcodmo_dataset_555666

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson
attribute	NC_GLOBAL	acquisition_description	String	Water column sample collection:\u00a0Samples were collected on the R/V Atlantis in January through February 2010, and the R/V Melville in March through April 2011 on a zonal transect along 20\u00ba S between 80\u00ba W and 100\u00ba W, with exact station locations and sample depths, nutrient concentrations and isotopic compositions reported below. Water column samples were collected by Niskin bottles deployed on a rosette equipped with conductivity-temperature-depth (CTD) sensors. All samples were collected into acid-washed, sample-rinsed HDPE bottles, and samples from the upper 400 m passed a 0.2 \u00b5m filter before collection. All samples were stored at -20\u00ba C until analysis on land. 15N2 fixation rate measurements: Short-term N2 fixation rate measurements incubated with 15N2 gas from Sigma Aldrich (lot #s SZ1670V and MBBB0968V) were carried out in acid-washed, sample-rinsed light transparent 4 L polycarbonate bottles amended with 1.5 mL of 99% 15N2\u00a0 and 1.5 mL of 0.5M NaH13CO3. Incubations were performed under simulated in situ conditions of temperature and light and run for staggered periods (e.g. 0, 12, 24 and 48 hrs). Incubations were terminated by filtration of the 4 L sample onto a precombusted 25 mm Whatman GF/F, which was then analyzed by mass spectrometry at the University of Southern California for d15N and d13C. During ESTP 1, periodic time zero incubations were measured, with samples filtered within 5 to 10 minutes of injection of 15N2. Zero time enrichments were typically near natural abundance levels with the greatest observed enrichment in 8 experiments at 23\u2030, essentially at natural abundance level for our tracer experiments. We assumed natural abundance (0.3663 atom %) for calculations. Limits of detection are about 10-14 \u00b5g for N and 6-10 \u00b5g for C. Reproducibility as the standard deviation for isotopic analysis is about \u00b10.3\u2030 for d15N and \u00b10.2\u2030 for d13C, and about \u00b10.1-0.2 \u00b5g for mass determinations.
attribute	NC_GLOBAL	awards_0_award_nid	String	55039
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-0850801
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850801
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	Donald L. Rice
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51467
attribute	NC_GLOBAL	awards_1_award_nid	String	55105
attribute	NC_GLOBAL	awards_1_award_number	String	OCE-0850905
attribute	NC_GLOBAL	awards_1_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0850905
attribute	NC_GLOBAL	awards_1_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_1_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_1_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_1_program_manager	String	Donald L. Rice
attribute	NC_GLOBAL	awards_1_program_manager_nid	String	51467
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	nitrogen fixation rates A. Knapp (FSU) et al version: 2016-02-29
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2015-04-10T14:28:52Z
attribute	NC_GLOBAL	date_modified	String	2019-04-08T18:38:32Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/7227
attribute	NC_GLOBAL	Easternmost_Easting	double	-80.0
attribute	NC_GLOBAL	geospatial_lat_max	double	-15.0
attribute	NC_GLOBAL	geospatial_lat_min	double	-20.0
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-80.0
attribute	NC_GLOBAL	geospatial_lon_min	double	-100.0
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	180.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	150.0
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/555666
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	CTD
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	555688
attribute	NC_GLOBAL	instruments_0_description	String	The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/130/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	CTD profiler
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	417
attribute	NC_GLOBAL	instruments_0_supplied_name	String	CTD
attribute	NC_GLOBAL	instruments_1_acronym	String	Gas Chromatograph
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	555772
attribute	NC_GLOBAL	instruments_1_description	String	Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB02/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Gas Chromatograph
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	661
attribute	NC_GLOBAL	instruments_1_supplied_name	String	Gas Chromatograph
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, chemical, cruise, cruise_id, data, dataset, date, depth, deviation, dmo, erddap, latitude, longitude, management, nfix, Nfix_stdev, Nfix_umol_N_m2_d, oceanography, office, preliminary, standard, standard deviation, station, stdev, time, umol
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/555666/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/555666
attribute	NC_GLOBAL	Northernmost_Northing	double	-15.0
attribute	NC_GLOBAL	param_mapping	String	{'555666': {'lat': 'master - latitude', 'depth': 'master - depth', 'lon': 'master - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/555666/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	University of Southern California
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	USC-WIES
attribute	NC_GLOBAL	people_0_person_name	String	Douglas G. Capone
attribute	NC_GLOBAL	people_0_person_nid	String	50669
attribute	NC_GLOBAL	people_0_role	String	Lead Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	University of Southern California
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	USC-WIES
attribute	NC_GLOBAL	people_1_person_name	String	William M. Berelson
attribute	NC_GLOBAL	people_1_person_nid	String	50600
attribute	NC_GLOBAL	people_1_role	String	Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	University of Miami Rosenstiel School of Marine and Atmospheric Science
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	UM-RSMAS
attribute	NC_GLOBAL	people_2_person_name	String	Dennis Hansell
attribute	NC_GLOBAL	people_2_person_nid	String	50539
attribute	NC_GLOBAL	people_2_role	String	Principal Investigator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	University of Miami Rosenstiel School of Marine and Atmospheric Science
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	UM-RSMAS
attribute	NC_GLOBAL	people_3_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_3_person_nid	String	555499
attribute	NC_GLOBAL	people_3_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_3_role_type	String	originator
attribute	NC_GLOBAL	people_4_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_4_affiliation_acronym	String	FSU - EOAS
attribute	NC_GLOBAL	people_4_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_4_person_nid	String	555499
attribute	NC_GLOBAL	people_4_role	String	Contact
attribute	NC_GLOBAL	people_4_role_type	String	related
attribute	NC_GLOBAL	people_5_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_5_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_5_person_name	String	Nancy Copley
attribute	NC_GLOBAL	people_5_person_nid	String	50396
attribute	NC_GLOBAL	people_5_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_5_role_type	String	related
attribute	NC_GLOBAL	project	String	N2 fixation ETSP
attribute	NC_GLOBAL	projects_0_acronym	String	N2 fixation ETSP
attribute	NC_GLOBAL	projects_0_description	String	Description from NSF award abstract: Several independent lines of geochemical and remote sensing evidence suggest that dinitrogen (N2) fixation may be associated with surface waters downstream of major oxygen minimum zones (OMZs) and in particular in the Eastern Tropical South Pacific (ETSP). However, little direct evidence supports these inferences. Besides substantiating these indirect assessments, documenting significant N2 fixation in the ETSP would provide insight into two longstanding controversies: Is the marine N budget balanced, as implied by modeling and paleoceanographic data, and if so, how are the processes that add and remove N spatially, and thus temporally coupled? In this project researchers at the University of Southern California and the University of Miami will test the hypothesis that fixation occurs in the ETSP at areal rates that equal or exceed those previously documented in more well-studied regions such as the oligotrophic waters of the sub/tropical North Atlantic. If scaled to the surface area of ETSP waters, this could add an additional 10-50 Tg N per year of inputs to the global marine N budget. They will undertake two cruises in the ETSP during early and late summer in two consecutive years to assess the quantitative significance of N2 fixation as a source of new N to surface waters using complementary biological and geochemical tools. N2 fixation rates will be evaluated on two temporal/spatial scales: daily/local (bottle 15N2 incubations and floating sediment traps); and seasonal/regional (d15N budget using moored sediment traps and water column TDN d15N). These estimates provide detailed observations of potential N2 fixation during station occupation in two summer seasons, when rates are expected to be greatest, as well as prolonged observation over lower expected N2 fixation periods. A combination of these different estimates will aim to determine if N2 fixation in this region can help balance the marine N budget. If all goes as planned, this study will determine the quantitative importance of N2 fixation in the ETSP, and whether these previously undocumented rates can help resolve the marine N budget. Implications include the ability of the marine N cycle to maintain homeostasis, and thus the global C cycle on glacial/interglacial time scales.
attribute	NC_GLOBAL	projects_0_end_date	String	2012-07
attribute	NC_GLOBAL	projects_0_geolocation	String	Eastern Tropical South Pacific
attribute	NC_GLOBAL	projects_0_name	String	Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific
attribute	NC_GLOBAL	projects_0_project_nid	String	555496
attribute	NC_GLOBAL	projects_0_start_date	String	2009-08
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	Southernmost_Northing	double	-20.0
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	15N2 incubation-based N2 fixation rates, nitrate plus nitrite concentration and d15N, sediment trap PN mass flux and isotopic composition from the Eastern Tropical South Pacific, 2010 and 2011.
attribute	NC_GLOBAL	title	String	[nitrogen fixation rates] - 15N2-based N2 fixation rates from the Eastern Tropical South Pacific collected on the R/V Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project) (Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-100.0
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	cruise_id		String
attribute	cruise_id	bcodmo_name	String	cruise_id
attribute	cruise_id	description	String	cruise_id
attribute	cruise_id	long_name	String	Cruise Id
attribute	cruise_id	units	String	unitless
variable	date		String
attribute	date	bcodmo_name	String	date_local
attribute	date	description	String	sample collection date (local). Format: yyyy-mm-dd
attribute	date	long_name	String	Date
attribute	date	source_name	String	date
attribute	date	time_precision	String	1970-01-01
attribute	date	units	String	unitless
variable	station		byte
attribute	station	_FillValue	byte	127
attribute	station	actual_range	byte	1, 13
attribute	station	bcodmo_name	String	sta
attribute	station	description	String	station
attribute	station	long_name	String	Station
attribute	station	units	String	unitless
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	-20.0, -15.0
attribute	latitude	axis	String	Y
attribute	latitude	bcodmo_name	String	latitude
attribute	latitude	colorBarMaximum	double	90.0
attribute	latitude	colorBarMinimum	double	-90.0
attribute	latitude	description	String	latitude; north is positive
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LATX/
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	_FillValue	double	NaN
attribute	longitude	actual_range	double	-100.0, -80.0
attribute	longitude	axis	String	X
attribute	longitude	bcodmo_name	String	longitude
attribute	longitude	colorBarMaximum	double	180.0
attribute	longitude	colorBarMinimum	double	-180.0
attribute	longitude	description	String	longitude; east is positive
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/LONX/
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	_FillValue	double	NaN
attribute	depth	actual_range	double	150.0, 180.0
attribute	depth	axis	String	Z
attribute	depth	bcodmo_name	String	depth
attribute	depth	colorBarMaximum	double	8000.0
attribute	depth	colorBarMinimum	double	-8000.0
attribute	depth	colorBarPalette	String	TopographyDepth
attribute	depth	description	String	sample depth
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P09/current/DEPH/
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	Nfix_umol_N_m2_d		byte
attribute	Nfix_umol_N_m2_d	_FillValue	byte	127
attribute	Nfix_umol_N_m2_d	actual_range	byte	23, 98
attribute	Nfix_umol_N_m2_d	bcodmo_name	String	N2_fix
attribute	Nfix_umol_N_m2_d	description	String	24 hr 15N2 fixation rate
attribute	Nfix_umol_N_m2_d	long_name	String	Nfix Umol N M2 D
attribute	Nfix_umol_N_m2_d	units	String	umol N m-2 d-1
variable	Nfix_stdev		short
attribute	Nfix_stdev	_FillValue	short	32767
attribute	Nfix_stdev	actual_range	short	9, 129
attribute	Nfix_stdev	bcodmo_name	String	standard deviation
attribute	Nfix_stdev	description	String	24 hr 15N2 fixation rate standard deviation
attribute	Nfix_stdev	long_name	String	Nfix Stdev
attribute	Nfix_stdev	units	String	umol N m-2 d-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.