Dataset: GP15 He Isotope C(He) and C(Ne) - Leg 2

Name: Helium isotope with helium and neon concentration data from 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: 2021-09-30
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.862220.1

Spatial Extent: N:18.906 E:-151.986 S:-20 W:-155.258

Temporal Extent: 2018-10-25 - 2018-11-23

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:

2021-09-30

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Helium isotope with helium and neon concentration data from 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 helium isotope, helium, and neon concentration data from 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.

Expand/Collapse All

Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-09-30	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.862220.1	2021-10-08

Methods & Sampling

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 and stored in aluminosilicate glass ampoules. The extracted gases were analyzed for helium and neon concentrations using ion counting in a quadrupole mass spectrometer and for helium isotopes using a magnetic sector dual-collecting isotope ratio mass spectrometer. Details are given in Jenkins et al. (2019) and Stanley et al. (2007).

Note: Natural and bomb tritium will decay to 3He in the copper tubing water sample container between the time the water sample was acquired and when the gases were extracted. We account for this using tritium concentrations estimated from a prior (2015) cruise occupation extrapolated in time and interpolated in space to the sample location and time. The size of this effect is significant in shallow, northern waters and vanishingly small in deeper and more southerly waters.

SPECIAL NOTE: The sample obtained from Station 21, Cast 11, Bottle 1 (5440 dbar) is excluded because the helium and nutrient results clearly indicate that tbe bottle has either pre/post-tripped or leaked and is not representative of the other bottles tripped at/near this depth. To our knowledge, ODF has not flagged this bottle as invalid, so be aware that any results from this particular water sample (station/cast/bottle) should be ignored.

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.

BCO-DMO Processing:
- renamed fields to comply with BCO-DMO naming conventions; - converted date field to YYYY-MM-DD format; - added date/time field in ISO8601 format; - removed empty columns.

Data Files

File
He_Isotope_Leg2.csv (Comma Separated Values (.csv), 52.03 KB) MD5:83a985285b40429d0df21bc36b098737 Primary data file for dataset ID 862220

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

Isotope-ratio Mass Spectrometer

Supplied Name: magnetic sector dual-collecting isotope ratio mass spectrometer

Supplied Description:

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

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).

Niskin bottle

Supplied Name: Niskin bottles

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: quadrupole mass spectrometer

Supplied Description:

The quadrupole mass spectrometer model is HIDEN P/N PCI 1000 1.2HAL/3F 1301-9 PIC type 570,309.

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_Date_UTC	Start date; format: YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Start_Time_UTC	Start time (UTC); format: hh:mm Format: %H:%M	unitless	time
Start_ISO_DateTime_UTC	Start date and time (UTC) in ISO8601 format: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Start_Latitude	Start latitude	decimal degrees North	lat
Start_Longitude	Start longitude	decimal degrees East	lon
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
He_D_CONC_BOTTLE_rkpksh	Concentration of dissolved Helium	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
SD1_He_D_CONC_BOTTLE_rkpksh	Standard deviation of He_D_CONC_BOTTLE_rkpksh	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
Flag_He_D_CONC_BOTTLE_rkpksh	Quality flag for He_D_CONC_BOTTLE_rkpksh	unitless	q_flag
Ne_D_CONC_BOTTLE_bwbllu	Concentration of dissolved Neon	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
SD1_Ne_D_CONC_BOTTLE_bwbllu	Standard deviation of Ne_D_CONC_BOTTLE_bwbllu	nanomoles per kilogram (nmol/kg)	diss_noble_gas_conc
Flag_Ne_D_CONC_BOTTLE_bwbllu	Quality flag for Ne_D_CONC_BOTTLE_bwbllu	unitless	q_flag
He_3_4_D_DELTA_BOTTLE_ry4ves	Delta 3He of dissolved He referenced to air; corrected for in-storage tritium decay	percent (%)	diss_noble_gas_conc
SD1_He_3_4_D_DELTA_BOTTLE_ry4ves	Standard deviation of He_3_4_D_DELTA_BOTTLE_ry4ves	percent (%)	diss_noble_gas_conc
Flag_He_3_4_D_DELTA_BOTTLE_ry4ves	Quality flag for He_3_4_D_DELTA_BOTTLE_ry4ves	unitless	q_flag

Status message

Database

Contribute Data

Dataset: GP15 He Isotope C(He) and C(Ne) - Leg 2