Dataset: N2 Gas Excess
Deployment: HLY1702

N2 gas concentration in excess of saturation determined by N2:Ar ratiometry

Principal Investigator:

Mark A. Altabet (University of Massachusetts Dartmouth SMAST, UMASSD-SMAST)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: GEOTRACES Arctic Ocean section-Constraining Nitrogen Cycling in the western Arctic Ocean. (US GEOTRACES Arctic Nitrogen Flux)

Data URL:

https://www.bco-dmo.org/dataset-deployment/812086/data

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Description

N2 gas concentration in excess of saturation determined by N2:Ar ratiometry.

Methods & Sampling

Dataset acquisition description

Sampling at sea was done using a standard SeaBird CTD/Rosette system. Hydrographic data processing used SeaBird software and standard procedures.

N2 excess was determined from N2/Ar ratios measured using procedures described by Charoenpong et al. (2014) with an IsoPrime Isotope Ratio Mass Spectrometer (IRMS) using IonVantage software.

Final data reduction and organization was done using Microsoft Excel.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- renamed fields;
- changed date format to yyyy-mm-dd from mm/dd/yy;
- changed #N/A to nd ("no data").

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1434417	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird

Supplied Name: SeaBird CTD/Rosette

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.

Isotope-ratio Mass Spectrometer

Supplied Name: IsoPrime Isotope Ratio Mass Spectrometer (IRMS)

Supplied Description:

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec; IRMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

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).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Station	Station number	unitless	station
Niskin	Niskin bottle number	unitless	bottle
Lat	Latitude	degrees North	lat
Lon	Longitude	degrees East	lon
Date	Date; format: yyyy-mm-dd	unitless	date
Depth	Depth	meters (m)	depth
Temp	Temperature	degrees Celsius	temp
Salinity	Salinity	unitless	sal
Sigma_Theta	Sigma theta density	kg/m3 -1000	sigma_theta
excess_N2	Excess N2	umol/kg	N
excess_N2_stdev	Standard deviation of replicate measurements	umol/kg	N

Database

Contribute Data

Dataset: N2 Gas Excess
Deployment: HLY1702

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: N2 Gas ExcessDeployment: HLY1702

Dataset acquisition description

Dataset Processing Description

Dataset: N2 Gas Excess
Deployment: HLY1702