ERDDAP > info > bcodmo_dataset_529599

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
	set	data	graph		files	public	[Dissolved Nitrous Oxide] - Dissolved N2O concentration and stable isotope/isotopomer composition measurements from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project) (Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre)		F   I   M	background			BCO-DMO	bcodmo_dataset_529599

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	Single water samples for N2O analyses were collected from acid-cleaned, Teflon-coated X-Niskin sampling bottles (OceanTest Equipment) of 8-liter capacity deployed on an epoxy-coated rosette (Sea-Bird Electronics) as described in Noble et al. (2012). Immediately after rosette recovery, water samples were collected by twice overfilling 160 ml glass serum bottles (Wheaton prod. no. 223748) from the bottom up using tygon tubing attached to each niskin bottle. A small headspace was introduced into each sample by pipetting 1 ml of sample off the top. The sample was then poisoned with 100 ul of saturated HgCl2 solution and sealed with gray butyl septa (MicroLiter Analytics prod. no. 20-0025) and aluminum crimps. Poisoned samples were stored for several months in the dark at room temperature before analysis. Isotopic analyses of N2O were made using a Finnigan DELTA PLUS XP IRMS calibrated for isotopomer-specific measurements (see Frame & Casciotti (2010) for details) and referenced against injections of a calibrated N2O reference tank (d15Nbulk = 0.31\u2030, SP = -1.2\u2030, d18O = 40.85\u2030 as calibrated by S. Toyoda, Toykyo Tech) with quality control checks against analyses of tropospheric air samples. Bottles were purged with He and N2O was trapped on- line with a custom-built purge and trap system (McIlvin & Casciotti, 2010). The molar amount of N2O was determined from each bottle using a constant linear relationship of m/z 44 peak area to molar quantity of N2O which is 2.15 Vs per nanomole of N2O, then converted to a concentration by dividing the molar amount by the volume of sample extracted (154 ml). The ratios of sample N2O to reference gas N2O values of m/z 31/30, 45/44, and 46/44 were corrected for a small linear dependence of these values on the sample peak area (see McIlvin and Casciotti 2010), with all ratios corrected to a peak area of 20 Vs. For a 160 ml water sample containing 2.2 nmole of N2O (typical of the lowest concentrations in this dataset), the precision of the d18O = \u00b10.25\u2030, d15Nbulk = \u00b10.09\u2030, and SP = \u00b10.33\u2030. Additional details about measurement precision are included in McIlvin & Casciotti (2010). Triplicate samples of tropospheric N2O from Woods Hole, MA had _d15Na = 15.0 \u00b1 0.1\u2030, _d15Nb = \u22121.9 \u00b1 0.1\u2030, d_18O = 44.4 \u00b1 0.2\u2030, _d15Nbulk = 6.5 \u00b1 0.1\u2030, SP = 16.9 \u00b1 0.1\u2030, and m/z 44 peak area = 15.6 \u00b1 0.2 Vs. All cruise data are included here except two measurements with background interference.
attribute	NC_GLOBAL	awards_0_award_nid	String	54681
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-0452883
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0452883
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	55017
attribute	NC_GLOBAL	awards_1_award_number	String	OCE-1031271
attribute	NC_GLOBAL	awards_1_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1031271
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	awards_2_award_nid	String	55159
attribute	NC_GLOBAL	awards_2_award_number	String	OCE-0928414
attribute	NC_GLOBAL	awards_2_data_url	String	http://nsf.gov/awardsearch/showAward?AWD_ID=0928414&HistoricalAwards=false
attribute	NC_GLOBAL	awards_2_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_2_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_2_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_2_program_manager	String	Donald L. Rice
attribute	NC_GLOBAL	awards_2_program_manager_nid	String	51467
attribute	NC_GLOBAL	awards_3_award_nid	String	529604
attribute	NC_GLOBAL	awards_3_award_number	String	OCE-0752291
attribute	NC_GLOBAL	awards_3_data_url	String	http://www.nsf.gov/awardsearch/showAward?AWD_ID=0752291
attribute	NC_GLOBAL	awards_3_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_3_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_3_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_3_program_manager	String	Donald L. Rice
attribute	NC_GLOBAL	awards_3_program_manager_nid	String	51467
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Dissolved nitrous oxide and stable isotopes/isotopomers CoFeMUG cruise KN192-05 PI: Karen Casciotti (Stanford) Co-PI: Caitlin Frame (University of Basel) Version: 17 Sept 2014
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	2014-10-03T15:33:32Z
attribute	NC_GLOBAL	date_modified	String	2020-03-31T17:27:18Z
attribute	NC_GLOBAL	defaultDataQuery	String	&time<now
attribute	NC_GLOBAL	doi	String	10.26008/1912/bco-dmo.529599.1
attribute	NC_GLOBAL	Easternmost_Easting	double	14.5
attribute	NC_GLOBAL	geospatial_lat_max	double	-12.0
attribute	NC_GLOBAL	geospatial_lat_min	double	-25.0
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	14.5
attribute	NC_GLOBAL	geospatial_lon_min	double	-20.0
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/529599
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	Isotopic analyses of N2O were made using a Finnigan DELTA PLUS XP IRMS calibrated for isotopomer-specific measurements; see Frame & Casciotti (2010) for details.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	529615
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	Finnigan DELTA PLUS XP IRMS
attribute	NC_GLOBAL	instruments_1_acronym	String	TM Bottle
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Single water samples for N2O analyses were collected from acid-cleaned, Teflon-coated X-Niskin sampling bottles (OceanTest Equipment) of 8-liter capacity deployed on an epoxy-coated rosette (Sea-Bird Electronics).
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	529614
attribute	NC_GLOBAL	instruments_1_description	String	Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples.
attribute	NC_GLOBAL	instruments_1_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L05/current/30/
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Trace Metal Bottle
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	493
attribute	NC_GLOBAL	instruments_1_supplied_name	String	Teflon-coated X-Niskin sampling bottles (Ocean Test Equipment)
attribute	NC_GLOBAL	keywords	String	bco, bco-dmo, biological, chemical, code, cruise, cruise_id, d15, d15Na_N2O, d15Nb_N2O, d15Nbulk_N2O, d18, d18O_N2O, data, dataset, date, date_event, dmo, erddap, ev_code, event, latitude, lon_360, longitude, management, N2O, nbulk, oceanography, office, preliminary, press, SP_N2O, sta
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/529599/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/529599
attribute	NC_GLOBAL	Northernmost_Northing	double	-12.0
attribute	NC_GLOBAL	param_mapping	String	{'529599': {'lat': 'flag - latitude', 'press': 'flag - depth', 'lon': 'flag - longitude'}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/529599/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Stanford University
attribute	NC_GLOBAL	people_0_person_name	String	Karen L. Casciotti
attribute	NC_GLOBAL	people_0_person_nid	String	50980
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	University of Basel (Universitat Basel)
attribute	NC_GLOBAL	people_1_person_name	String	Caitlin Frame
attribute	NC_GLOBAL	people_1_person_nid	String	529608
attribute	NC_GLOBAL	people_1_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Stanford University
attribute	NC_GLOBAL	people_2_person_name	String	Karen L. Casciotti
attribute	NC_GLOBAL	people_2_person_nid	String	50980
attribute	NC_GLOBAL	people_2_role	String	Contact
attribute	NC_GLOBAL	people_2_role_type	String	related
attribute	NC_GLOBAL	people_3_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_3_person_name	String	Shannon Rauch
attribute	NC_GLOBAL	people_3_person_nid	String	51498
attribute	NC_GLOBAL	people_3_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_3_role_type	String	related
attribute	NC_GLOBAL	project	String	CoFeMUG
attribute	NC_GLOBAL	projects_0_acronym	String	CoFeMUG
attribute	NC_GLOBAL	projects_0_description	String	The geochemistries of dissolved cobalt (Co) and iron (Fe) in the oceanic water column share several characteristics such as extremely low concentrations, redox chemistry, low solubility,and utilization as micronutrients by marine microbes. Iron has been the subject of considerable research focus in recent years due to its role in limiting phytoplankton productivity in oceanic and coastal upwelling environments. Cobalt has been much less studied, but recent data show it may be important in influencing primary productivity or phytoplankton community composition in certain geographical areas. The CoFeMUG project predated GEOTRACES, so while it is not formally recognized as a GEOTRACES section, it is considered a GEOTRACES-related project and the CoFeMUG data are GEOTRACES compliant. State-of-the-art geochemical and molecular biological techniques were used to address biogeochemical questions in the South Atlantic, and focus especially on the two trace metals, cobalt and iron. The 27-day cruise in November and December 2007 to the South Atlantic was designed to study cobalt and iron biogeochemistry and focus on four major hypotheses. (1) Large fluxes of labile cobalt are associated with upwelling systems even in Aeolian dominated environments. (2) Cobalt and phosphate show correlations in (and only in) surface waters due to micronutrient utilization and rapid remineralization. The slope of the correlation is dependent on the chemical speciation of cobalt. (3) The absence of Trichodesmium populations in the subtropical and tropical South Atlantic is caused by iron limitation. (4) Based on work from the California and Peru Upwelling regimes, primary productivity in the Benguela upwelling regime off of South West Africa may be iron limited or iron-cobalt colimited. A combination of geochemical and biological/molecular analyses were made across an oligotrophic-upwelling transition to examine how changing metal regimes affect the physiology and growth of the important primary producers Trichodesmium and Synechococcus. CoFeMUG project results are published in: Noble, Abigail E., Carl H. Lamborg, Dan C. Ohnemus, Phoebe J. Lam, Tyler J. Goepfert, Chris I. Measures, Caitlin H. Frame, Karen L. Casciotti, Giacomo R. DiTullio, Joe Jennings, and Mak A. Saito (2012) Basin-scale inputs of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean. Limnology & Oceanography. Vol. 57(4), July 2012. pgs 989-1010. doi:10.4319/lo.2012.57.4.0989 (www.aslo.org/lo/toc/vol_57/issue_4/0989.pdf)
attribute	NC_GLOBAL	projects_0_end_date	String	2008-03
attribute	NC_GLOBAL	projects_0_geolocation	String	South Atlantic subtropical gyre and Benguela upwelling region
attribute	NC_GLOBAL	projects_0_name	String	Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre
attribute	NC_GLOBAL	projects_0_project_nid	String	2067
attribute	NC_GLOBAL	projects_0_start_date	String	2005-03
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	-25.0
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	subsetVariables	String	cruise_id
attribute	NC_GLOBAL	summary	String	Dissolved N2O concentration and stable isotope/isotopomer composition measurements made from samples from acid-cleaned, Teflon-coated X-Niskin sampling bottles on the CoFeMUG cruise (KN192-05).
attribute	NC_GLOBAL	title	String	[Dissolved Nitrous Oxide] - Dissolved N2O concentration and stable isotope/isotopomer composition measurements from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project) (Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre)
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	Westernmost_Easting	double	-20.0
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	Official cruise identifier.
attribute	cruise_id	long_name	String	Cruise Id
attribute	cruise_id	units	String	dimensionless
variable	sta		byte
attribute	sta	_FillValue	byte	127
attribute	sta	actual_range	byte	5, 27
attribute	sta	bcodmo_name	String	sta
attribute	sta	description	String	Station number.
attribute	sta	long_name	String	Sta
attribute	sta	units	String	dimensionless
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	_FillValue	double	NaN
attribute	latitude	actual_range	double	-25.0, -12.0
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	-20.0, 14.5
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. Calculated by BCO-DMO from the original PI-provided lon_360 values.
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	lon_360		float
attribute	lon_360	_FillValue	float	NaN
attribute	lon_360	actual_range	float	0.0, 357.5
attribute	lon_360	bcodmo_name	String	lon_360
attribute	lon_360	colorBarMaximum	double	180.0
attribute	lon_360	colorBarMinimum	double	-180.0
attribute	lon_360	description	String	Longitude measured from 0 to 360 degrees.
attribute	lon_360	long_name	String	Longitude
attribute	lon_360	standard_name	String	longitude
attribute	lon_360	units	String	decimal degrees
variable	press		double
attribute	press	_FillValue	double	NaN
attribute	press	actual_range	double	9.0, 5106.0
attribute	press	bcodmo_name	String	pressure
attribute	press	description	String	Pressure.
attribute	press	long_name	String	Press
attribute	press	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/
attribute	press	units	String	decibars (db)
variable	ev_code		String
attribute	ev_code	bcodmo_name	String	event code
attribute	ev_code	description	String	Event code; type and number of sampling event; matches cruise event log.
attribute	ev_code	long_name	String	Ev Code
attribute	ev_code	units	String	dimensionless
variable	event		int
attribute	event	_FillValue	int	2147483647
attribute	event	actual_range	int	11220908, 12111150
attribute	event	bcodmo_name	String	event
attribute	event	description	String	Event number from the cruise event log.
attribute	event	long_name	String	Event
attribute	event	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/
attribute	event	units	String	dimensionless
variable	date_event		int
attribute	date_event	_FillValue	int	2147483647
attribute	date_event	actual_range	int	20071122, 20071211
attribute	date_event	bcodmo_name	String	date
attribute	date_event	description	String	Year-month-day of the event; added by BCO-DMO from the cruise event log. in the format YYYYmmdd
attribute	date_event	long_name	String	Date Event
attribute	date_event	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/
attribute	date_event	units	String	unitless
variable	N2O		float
attribute	N2O	_FillValue	float	NaN
attribute	N2O	actual_range	float	6.8, 49.3
attribute	N2O	bcodmo_name	String	Nitrous Oxide
attribute	N2O	description	String	Dissolved N2O concentration.
attribute	N2O	long_name	String	N2 O
attribute	N2O	units	String	nanomoles per liter (nm/L)
variable	d15Nbulk_N2O		float
attribute	d15Nbulk_N2O	_FillValue	float	NaN
attribute	d15Nbulk_N2O	actual_range	float	-0.1, 9.1
attribute	d15Nbulk_N2O	bcodmo_name	String	unknown
attribute	d15Nbulk_N2O	description	String	d15Nbulk-N2O = average (bulk) isotope ratio (15N/14N) of both nitrogen atoms in N2O. Calculated as d15Nbulk-N2O = (d15Na-N2O + d15Nb-N2O)/2; referenced to atmospheric N2.
attribute	d15Nbulk_N2O	long_name	String	D15 Nbulk N2 O
attribute	d15Nbulk_N2O	units	String	per mil (‰)
variable	SP_N2O		float
attribute	SP_N2O	_FillValue	float	NaN
attribute	SP_N2O	actual_range	float	5.3, 25.2
attribute	SP_N2O	bcodmo_name	String	unknown
attribute	SP_N2O	description	String	SP-N2O = site preference of 15N in N2O. Calculated as (d15Na-N2O - d15Nb-N2O); the difference between d15Na-N2O and d15Nb-N2O.
attribute	SP_N2O	long_name	String	SP N2 O
attribute	SP_N2O	units	String	per mil (‰)
variable	d18O_N2O		float
attribute	d18O_N2O	_FillValue	float	NaN
attribute	d18O_N2O	actual_range	float	37.5, 52.2
attribute	d18O_N2O	bcodmo_name	String	unknown
attribute	d18O_N2O	description	String	d18O-N2O = isotope ratio (18O/16O) of oxygen in N2O. Calculated as d18O = ({[18O]/[16O]sample}/{[18O]/[16O]standard} -1) x 1000‰; referenced to VSMOW.
attribute	d18O_N2O	long_name	String	D18 O N2 O
attribute	d18O_N2O	units	String	per mil (‰)
variable	d15Na_N2O		float
attribute	d15Na_N2O	_FillValue	float	NaN
attribute	d15Na_N2O	actual_range	float	6.1, 19.8
attribute	d15Na_N2O	bcodmo_name	String	unknown
attribute	d15Na_N2O	description	String	d15Na-N2O = isotope ratio (15N/14N) in the internal nitrogen of N2O; d15Na-N2O = ({[15N]/[14N]a,sample}/{[15N]/[14N]a,standard} -1) x 1000‰; referenced to atmospheric N2 as the standard.
attribute	d15Na_N2O	long_name	String	D15 Na N2 O
attribute	d15Na_N2O	units	String	per mil (‰)
variable	d15Nb_N2O		float
attribute	d15Nb_N2O	_FillValue	float	NaN
attribute	d15Nb_N2O	actual_range	float	-9.5, 2.1
attribute	d15Nb_N2O	bcodmo_name	String	unknown
attribute	d15Nb_N2O	description	String	d15Nb-N2O = isotope ratio (15N/14N) in the external nitrogen of N2O; d15Nb-N2O = ({[15N]/[14N]b,sample}/{[15N]/[14N]b,standard} -1) x 1000‰; referenced to atmospheric N2 as the standard.
attribute	d15Nb_N2O	long_name	String	D15 Nb N2 O
attribute	d15Nb_N2O	units	String	per mil (‰)

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