ERDDAP > info > bcodmo_dataset_739646

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	[VAHINE nitrogen] - Dissolved and sinking particulate organic nitrogen data from a large volume mesocosm experiment in the Noumea Lagoon, New Caledonia, measured from January to February 2013 (Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean)		I   M	background			BCO-DMO	bcodmo_dataset_739646

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
attribute	NC_GLOBAL	acquisition_description	String	Sampling and analytical procedures: The concentration of total nitrogen (TN) for samples was determined by persulfate oxidation (Solorzano and Sharp, 1980) with adaptations (Knapp et al., 2005), and the resulting NO3- was measured by chemiluminescence (Braman and Hendrix, 1989). DON concentration was determined by subtracting the concentrations of PNsusp, NH4+, and NO3-+NO2- (reported in Berthelot et al., 2015, Biogeosciences) from the measured TN concentration of each sample with a propagated error of +/- 0.5 \u03bcM. The d15N of the resulting NO3- was measured using the denitrifier method (Casciotti et al., 2002; McIlvin and Casciotti, 2011; Sigman et al., 2001). The d15N of PNsink was measured using a Thermo Scientific Flash 2000 Elemental Analyzer coupled with a Delta Plus Thermo Scientific mass spectrometer. The average standard deviation for individual DON concentration measurements was +/- 0.3 \u00b5M. DON concentration was determined by subtracting the concentrations of PNsusp, NH4+, and NO3-+NO2- (reported in Berthelot et al., 2015, Biogeosciences) from the measured TN concentration of each sample with a propagated error of +/- 0.5 \u03bcM. The d15N of TN was determined via persulfate oxidation of TN to NO3- (Knapp et al., 2005) and subsequent analysis of NO3- d15N by the denitrifier method, with a propagated error for DON d15N calculated using a Monte Carlo method (Press et al., 1992) of +/- 0.6\u2030. Samples were calibrated with IAEA N3 and USGS 34 NO3- d15N isotopic reference materials as described in McIlvin and Casciotti, 2011. The d15N of PNsink was measured using a Thermo Scientific Flash 2000 Elemental Analyzer coupled with a Delta Plus Thermo Scientific mass spectrometer. The average standard deviation for standards was +/- 0.06\u2030.
attribute	NC_GLOBAL	awards_0_award_nid	String	710561
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1537314
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1537314
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	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	VAHINE nitrogen PI: Angela Knapp Data version 1: 2018-07-10
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	2018-07-10T19:07:01Z
attribute	NC_GLOBAL	date_modified	String	2018-07-12T18:56:18Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.739646.1
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/739646
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	IR Mass Spec
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	DON d15N was measured on a Thermo Delta V isotope ratio mass spectrometer.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	739696
attribute	NC_GLOBAL	instruments_0_description	String	The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB16/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Isotope-ratio Mass Spectrometer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	469
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Thermo Delta V isotope ratio mass spectrometer
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	DON concentration was measured on a Thermo Scientific 42i chemiluminescent NOx box.
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	739695
attribute	NC_GLOBAL	instruments_1_description	String	The chemiluminescence method for gas analysis of oxides of nitrogen relies on the measurement of light produced by the gas-phase titration of nitric oxide and ozone. A chemiluminescence analyzer can measure the concentration of NO/NO2/NOX. One example is the Teledyne Model T200: http://www.teledyne-api.com/products/T200.asp
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Chemiluminescence NOx Analyzer
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	542895
attribute	NC_GLOBAL	instruments_1_supplied_name	String	Thermo Scientific 42i chemiluminescent NOx
attribute	NC_GLOBAL	instruments_2_dataset_instrument_description	String	The d15N of PNsink was measured using a Thermo Scientific Flash 2000 Elemental Analyzer coupled with a Delta Plus Thermo Scientific mass spectrometer.
attribute	NC_GLOBAL	instruments_2_dataset_instrument_nid	String	739697
attribute	NC_GLOBAL	instruments_2_description	String	Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.
attribute	NC_GLOBAL	instruments_2_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/LAB01/
attribute	NC_GLOBAL	instruments_2_instrument_name	String	Elemental Analyzer
attribute	NC_GLOBAL	instruments_2_instrument_nid	String	546339
attribute	NC_GLOBAL	instruments_2_supplied_name	String	Thermo Scientific Flash 2000 Elemental Analyzer
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, chemical, d15, data, dataset, date, dmo, don, dond15, erddap, M1_d15NPNsink, M1_DON, M1_DONd15N, M2_d15NPNsink, M2_DON, M2_DONd15N, M3_d15NPNsink, M3_DON, M3_DONd15N, management, npnsink, oceanography, office, preliminary, sampling, time
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/739646/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/739646
attribute	NC_GLOBAL	param_mapping	String	{'739646': {}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/739646/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	FSU
attribute	NC_GLOBAL	people_0_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_0_person_nid	String	555499
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	Florida State University
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	FSU
attribute	NC_GLOBAL	people_1_person_name	String	Angela N. Knapp
attribute	NC_GLOBAL	people_1_person_nid	String	555499
attribute	NC_GLOBAL	people_1_role	String	Contact
attribute	NC_GLOBAL	people_1_role_type	String	related
attribute	NC_GLOBAL	people_2_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_2_person_name	String	Amber York
attribute	NC_GLOBAL	people_2_person_nid	String	643627
attribute	NC_GLOBAL	people_2_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_2_role_type	String	related
attribute	NC_GLOBAL	project	String	SW Pac N2 fixation
attribute	NC_GLOBAL	projects_0_acronym	String	SW Pac N2 fixation
attribute	NC_GLOBAL	projects_0_description	String	NSF Award Abstract: The availability of nitrogen in the surface ocean plays a critical role regulating rates of primary productivity in the ocean, and thus through modification of the carbon cycle, nitrogen has the capacity to influence climate. The dominant source of biologically available nitrogen to the ocean is through a process known as di-nitrogen (N2) fixation, which involves the reduction of N2 gas dissolved in seawater to ammonium by microbes referred to as diazotrophs. While significant progress has been made identifying a diversity of marine diazotrophs in recent years using molecular tools, quantifying global rates of N2 fixation, and identifying which ocean basin supports the highest fluxes, has remained a vexing question. This research will quantify rates of N2 fixation as well as its importance for supporting production in the southwest Pacific Ocean. Results from this research will shed light on the sensitivities of N2 fixation (temperature, iron concentrations) as well as the extent of spatial and temporal coupling of nitrogen sources and sinks in the ocean. The work will be carried out by an early career scientist, and involve mentoring of young women, middle school girls and minorities, training of undergraduate and graduate researchers, and international collaborations. Identifying the spatial distribution of the largest di-nitrogen (N2) fixation fluxes to the ocean remains a critical goal of chemical oceanography. The spatial distribution can inform our understanding of the environmental sensitivities of N2 fixation and the capacity for the dominant marine nitrogen (N) source and sink processes to respond to each other and thus influence the global carbon cycle and climate. In addition to temperature, two factors are at the heart of the current debate over what influences the spatial distribution of N2 fixation in the ocean: 1) the presence of adequate iron to meet the needs of N2 fixing microbes, and, 2) the absolute concentrations as well as ratios of surface ocean nitrate and phosphate concentrations that are low relative to the "Redfield" ratio, which are thought to favor N2 fixing microbes. This project will test the effects of gradients in atmospheric dust deposition on N2 fixation rates when surface waters have relatively constant but favorable nitrate to phosphate concentrations. The work will be carried out in the southwest Pacific, a region highlighted by new modeling work for its unique geochemical characteristics that are expected to favor significant N2 fixation fluxes. Nitrate+nitrite d15N as well as total dissolved nitrogen (TDN) concentration and d15N will be measured in water column samples collected on a French cruise and sediment traps were deployed to capture the sinking particulate N flux. The results will be compared with published work to evaluate which ocean regions support the largest N2 fixation fluxes. More information: This project was part of the Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) cruise in the Southwest Pacific between New Caledonia (166°28' E; 22°14' S) and Tahiti (149°36' W; 17°34' S) 0-2000 m​ * OUTPACE cruise (doi: https://dx.doi.org/10.17600/15000900) * OUTPACE website: https://outpace.mio.univ-amu.fr/?lang=en
attribute	NC_GLOBAL	projects_0_end_date	String	2018-07
attribute	NC_GLOBAL	projects_0_geolocation	String	Southwest Pacific Ocean between New Caledonia and Tahiti along ~18 deg S
attribute	NC_GLOBAL	projects_0_name	String	Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean
attribute	NC_GLOBAL	projects_0_project_nid	String	710562
attribute	NC_GLOBAL	projects_0_project_website	String	http://scope.soest.hawaii.edu/data/lava/lava.html
attribute	NC_GLOBAL	projects_0_start_date	String	2015-08
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	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	This dataset includes water column dissolved organic nitrogen (DON) concentration and d15N data, as well as sinking particulate nitrogen d15N (\u201cPNsink d15N\u201d) data. These samples were collected inside triplicate (\u201cM1\u201d, \u201cM2\u201d, and \u201cM3\u201d) large volume (i.e., 2.3 m diameter, 15 m deep) mesocosm experiments deployed in a lagoon off of Noumea, New Caledonia. DON samples were collected at 6 m depth daily by a Teflon pump and PVC tubing. PNsink d15N samples were collected daily by SCUBA divers who removed a screw-top plastic bottle from the bottom of the plastic mesocosm. \u201cSwimmers\u201d were removed from the PNsink d15N samples prior to analysis.\r\n\r\nThese measurements were made as part of project \VAriability of vertical and tropHIc transfer of diazotroph derived N in the south wEst Pacific\ (VAHINE) to study the fate of fixed nitrogen in the oceanic pelagic food web and its potential impact on carbon export. The field campaign of VAHINE took place in the South West Pacific (New Caledonia) in January and February of 2013 and involved 16 scientists from France, Israel, Germany and the USA.
attribute	NC_GLOBAL	title	String	[VAHINE nitrogen] - Dissolved and sinking particulate organic nitrogen data from a large volume mesocosm experiment in the Noumea Lagoon, New Caledonia, measured from January to February 2013 (Quantifying nitrogen fixation along unique geochemical gradients in the southwest Pacific Ocean)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	Sampling_Date		String
attribute	Sampling_Date	bcodmo_name	String	date
attribute	Sampling_Date	description	String	Sample date in format "dd-mmm-yyyy"
attribute	Sampling_Date	long_name	String	Sampling Date
attribute	Sampling_Date	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/
attribute	Sampling_Date	source_name	String	Sampling_Date
attribute	Sampling_Date	time_precision	String	1970-01-01
attribute	Sampling_Date	units	String	unitless
variable	M1_DON		float
attribute	M1_DON	_FillValue	float	NaN
attribute	M1_DON	actual_range	float	5.1, 5.9
attribute	M1_DON	bcodmo_name	String	Dissolved Organic Nitrogen
attribute	M1_DON	description	String	Dissolved organic nitrogen (replicate "M1")
attribute	M1_DON	long_name	String	M1 DON
attribute	M1_DON	units	String	micromolar (uM)
variable	M1_DONd15N		float
attribute	M1_DONd15N	_FillValue	float	NaN
attribute	M1_DONd15N	actual_range	float	3.2, 6.0
attribute	M1_DONd15N	bcodmo_name	String	N
attribute	M1_DONd15N	description	String	Dissolved organic nitrogen isotopic composition (replicate "M1")
attribute	M1_DONd15N	long_name	String	M1 DONd15 N
attribute	M1_DONd15N	units	String	per mil (0/00)
variable	M2_DON		float
attribute	M2_DON	_FillValue	float	NaN
attribute	M2_DON	actual_range	float	3.6, 7.0
attribute	M2_DON	bcodmo_name	String	Dissolved Organic Nitrogen
attribute	M2_DON	description	String	Dissolved organic nitrogen (replicate "M2")
attribute	M2_DON	long_name	String	M2 DON
attribute	M2_DON	units	String	micromolar (uM)
variable	M2_DONd15N		float
attribute	M2_DONd15N	_FillValue	float	NaN
attribute	M2_DONd15N	actual_range	float	4.1, 5.1
attribute	M2_DONd15N	bcodmo_name	String	N
attribute	M2_DONd15N	description	String	Dissolved organic nitrogen isotopic composition (replicate "M2")
attribute	M2_DONd15N	long_name	String	M2 DONd15 N
attribute	M2_DONd15N	units	String	per mil (0/00)
variable	M3_DON		float
attribute	M3_DON	_FillValue	float	NaN
attribute	M3_DON	actual_range	float	4.9, 6.5
attribute	M3_DON	bcodmo_name	String	Dissolved Organic Nitrogen
attribute	M3_DON	description	String	Dissolved organic nitrogen (replicate "M3")
attribute	M3_DON	long_name	String	M3 DON
attribute	M3_DON	units	String	micromolar (uM)
variable	M3_DONd15N		float
attribute	M3_DONd15N	_FillValue	float	NaN
attribute	M3_DONd15N	actual_range	float	4.0, 6.7
attribute	M3_DONd15N	bcodmo_name	String	N
attribute	M3_DONd15N	description	String	Dissolved organic nitrogen isotopic composition (replicate "M3")
attribute	M3_DONd15N	long_name	String	M3 DONd15 N
attribute	M3_DONd15N	units	String	per mil (0/00)
variable	M1_d15NPNsink		float
attribute	M1_d15NPNsink	_FillValue	float	NaN
attribute	M1_d15NPNsink	actual_range	float	0.2, 5.8
attribute	M1_d15NPNsink	bcodmo_name	String	N
attribute	M1_d15NPNsink	description	String	Sinking particulate nitrogen isotopic composition (replicate "M1")
attribute	M1_d15NPNsink	long_name	String	M1 D15 NPNsink
attribute	M1_d15NPNsink	units	String	per mil (0/00)
variable	M2_d15NPNsink		float
attribute	M2_d15NPNsink	_FillValue	float	NaN
attribute	M2_d15NPNsink	actual_range	float	0.1, 4.5
attribute	M2_d15NPNsink	bcodmo_name	String	N
attribute	M2_d15NPNsink	description	String	Sinking particulate nitrogen isotopic composition (replicate "M2")
attribute	M2_d15NPNsink	long_name	String	M2 D15 NPNsink
attribute	M2_d15NPNsink	units	String	per mil (0/00)
variable	M3_d15NPNsink		float
attribute	M3_d15NPNsink	_FillValue	float	NaN
attribute	M3_d15NPNsink	actual_range	float	0.6, 6.4
attribute	M3_d15NPNsink	bcodmo_name	String	N
attribute	M3_d15NPNsink	description	String	Sinking particulate nitrogen isotopic composition (replicate "M3")
attribute	M3_d15NPNsink	long_name	String	M3 D15 NPNsink
attribute	M3_d15NPNsink	units	String	per mil (0/00)

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.