Dataset: GP15 Heavy Noble Gas Concentrations Leg 2

Name: Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018
Published: 2022-08-10
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.877899.1

Spatial Extent: N:18.907 E:-151.986 S:-20 W:-155.258

Temporal Extent: 2018-10-24 - 2018-11-24

Project:

Measurement of Helium Isotopes on the U.S. GEOTRACES Alaska-Tahiti Section (GP15) (PMT Helium Isotopes)

US GEOTRACES Pacific Meridional Transect (GP15) (U.S. GEOTRACES PMT)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

William J. Jenkins (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Christopher R. German (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Version:

Version Date:

2022-08-10

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018

Abstract:

This dataset includes concentrations of dissolved argon (Ar), krypton (Kr), and xenon (Xe) from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2022-08-10	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.877899.1	2022-08-10

Methods & Sampling

Methodology:Quantitative vacuum extraction and mass spectrometry.

Sampling and Analytical Procedures:
Water samples were transferred from Niskin bottles and stored in crimped copper tubing. Gases were extracted from the water samples in a shore-based vacuum system (see references for description) and stored in aluminosilicate glass ampoules. The extracted gases were chemically purified and cryogenically separated, then analyzed for argon, krypton, and xenon concentrations using ion counting in a triple filter quadrupole mass spectrometer. Argon was measured using ion current manometry corrected for small linearity effects. Krypton and xenon were determined using ratiometric isotope dilution. All measurements were standardized to air abundances. Details are given in Jenkins et al (2019) and Stanley et al (2007).

Samples were acquired at sea in replicate. During the generation of this dataset 53 pairs of replicates were analyzed to assess reproducibility. The results are summarized in the attached Supplemental File named "GP15_ArKrXe_Replicates.csv" (note the results listed in this Supplemental File are reported as molar quantities).

Dissolved helium, neon, and helium isotopes were also measured on the same samples and are available at BCO-DMO (see "Related Datasets").

Data Processing Description

Data Processing:
Raw data were acquired and reduced using custom software written in VB.NET. Data were processed using MATLAB (2020b) and stored in a PostgreSQL V9.3 database.

Quality Flags:
Quality flags follow the ODF (WOCE) scheme. Defined as:
1 = Sample for this measurement was drawn from water bottle but analysis not received.
2 = Acceptable measurement.
3 = Questionable measurement.
4 = Bad measurement.
5 = Not reported.
6 = Mean of replicate measurements
7 = Manual chromatographic peak measurement.
8 = Irregular digital chromatographic peak integration.
9 = Sample not drawn for this measurement from this bottle.

BCO-DMO Processing:
- renamed fields to comply with BCO-DMO naming conventions.

Data Files

File
ArKrXe_Leg2.csv (Comma Separated Values (.csv), 34.70 KB) MD5:32021d5187c6d41abbd25d2a389d24e6 Primary data file for dataset ID 877899

Supplemental Files

File
GP15_ArKrXe_Replicates.csv (Comma Separated Values (.csv), 11.09 KB) MD5:28623f253fcdd9d101d7cb0a17ef1b44 Samples were acquired at sea in replicate. During the generation of this dataset 53 pairs of replicates were analyzed to assess reproducibility. The results are summarized in this Supplemental file.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1756138

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1815	GP15 GP15 Leg 2 33RR20180918 PMT US GEOTRACES PMT	2018-10-24	R/V Roger Revelle	Gregory A. Cutter (Chief Scientist) Karen L. Casciotti (Co-Chief Scientist) Phoebe J. Lam (Co-Chief Scientist)	data info

Instruments

Mass Spectrometer

Supplied Name:

Supplied Description:

The helium isotope mass spectrometer is a custom-built unit manufactured at the Woods Hole Oceanographic Institution.

Instrument Type

Generic Name: Mass Spectrometer

Acronym: Mass Spec

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

Generic Description:

General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.

Niskin bottle

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Quadrupole Mass Spectrometer

Supplied Name: HIDEN P/N PCI 1000 1.2HAL/3F 1301-9 PIC type 570,309

Supplied Description:

Instrument Type

Generic Name: Quadrupole Mass Spectrometer

Acronym: QMS

Generic Description:

A piece of apparatus that consists of an ion source, a mass-to-charge analyser, a detector and a vacuum system and is used to measure mass spectra. The detector is a quadrupole mass-to-charge analyser, which holds the ions in a stable orbit by an electric field generated by four parallel electrodes.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Station_ID	Station number	unitless	station
Start_Latitude	Latitude at start of sample collection	degrees North	lat
Start_Longitude	Longitude at start of sample collection	degrees East	lon
Cast_number	Cast number	unitless	cast
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
Ar_D_CONC_BOTTLE_unjql9	Dissolved argon	micromoles per kilogram (umol/kg)	diss_noble_gas_conc
SD1_Ar_D_CONC_BOTTLE_unjql9	One standard deviation of Ar_D_CONC_BOTTLE_unjql9	micromoles per kilogram (umol/kg)	diss_noble_gas_conc
Flag_Ar_D_CONC_BOTTLE_unjql9	ODF quality flag for Ar_D_CONC_BOTTLE_unjql9	unitless	q_flag
Kr_D_CONC_BOTTLE_uo0lmf	Dissolved krypton	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
SD1_Kr_D_CONC_BOTTLE_uo0lmf	One standard deviation of Kr_D_CONC_BOTTLE_uo0lmf	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
Flag_Kr_D_CONC_BOTTLE_uo0lmf	ODF quality flag for Kr_D_CONC_BOTTLE_uo0lmf	unitless	q_flag
Xe_D_CONC_BOTTLE_xoirom	Dissolved xenon	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
SD1_Xe_D_CONC_BOTTLE_xoirom	One standard deviation of Xe_D_CONC_BOTTLE_xoirom	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
Flag_Xe_D_CONC_BOTTLE_xoirom	ODF quality flag for Xe_D_CONC_BOTTLE_xoirom	unitless	q_flag

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Database

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Dataset: GP15 Heavy Noble Gas Concentrations Leg 2