Dataset: GP16 d13C-DIC

Name: The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013
Published: 2017-01-26
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.676537.1

Spatial Extent: N:-10.50017 E:-77.37617 S:-16.00067 W:-152.0005

Temporal Extent: 2013-10-29 - 2013-12-18

Project:

U.S. GEOTRACES East Pacific Zonal Transect (GP16) (U.S. GEOTRACES EPZT)

US GEOTRACES Pacific: Measuring the d13C-DIC distribution and quantifying the impact of organic matter export on d13C, nutrients and trace metals (EPZT d13C-DIC)

Program:

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

Principal Investigator:

Paul Quay (University of Washington, UW)

BCO-DMO Data Manager:

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

Version:

Version Date:

2017-01-26

Restricted:

Validated:

Yes

Current State:

Final no updates expected

The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013

Abstract:

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2017-01-26	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.676537.1	2020-04-10

Description

The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical South Pacific (GEOTRACES EPZT).

Methods & Sampling

Shipboard Sample Collection Methods: Sampliing was done using the ODF CTD rosette (12 30L Niskins). Samples were collected in pre-washed and baked 250 ml ground glass stoppered bottles that were poisoned with 100 ul of a saturated HgCl2 solution. The stored sealed samples were returned to the Stable Isotope Laboratory at the University of Washington for extraction and measurement.

Laboratory Methods: CO2 was extracted from the DIC seawater sample using a modification of the helium stripping technique described in Quay and Stutsman (2003). The del13C was measured on a Thermo Delta Plus XL mass spectrometer.

Data Processing Description

Data quality flag definitions:
2 = good data;
3 = questionable data;
9 = no data.

BCO-DMO Processing:
- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions;
- joined to BCO-DMO master EPZT events file and removed duplicate/unnecessary columns.

Additional GEOTRACES Processing:
As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:

cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.

This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

Data Files

File
d13C-DIC_joined.csv (Comma Separated Values (.csv), 68.96 KB) MD5:fc73e48462c5ecf4d2412774041112ca Primary data file for dataset ID 676537

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1233005

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TN303	GP16 GEOTRACES EPZT GEOTRACES East Pacific Zonal Transect (EPZT) GT13 325020131025	2013-10-25	R/V Thomas G. Thompson	James W. Moffett (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist) Christopher R. German (Co-Chief Scientist)	data info

Instruments

Mass Spectrometer

Supplied Name: Thermo Delta Plus XL mass spectrometer

Supplied Description:

The del13C is measured on a Thermo Delta Plus XL mass spectrometer.

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 Name:

Supplied Description:

Samples were collected by the ODF CTD rosette (12 30L Niskins).

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identification	unitless	cruise_id
EXPOCODE	Cruise EXPO code.	unitless	EXPOCODE
GEOTRC_INSTR	Sampling instrument; added from BCO-DMO EPZT master events file.	unitless	instrument
STNNBR	Station number	unitless	station
GEOTRC_SAMPNO	Unique GEOTRACES sample number	unitless	sample
GEOTRC_EVENTNO	GEOTRACES event number	unitless	event
CASTNO	Cast number	unitless	cast
DIC_13_D_DELTA_BOTTLE	d13C-DIC; Carbon 13 to Carbon 12 ratio of DIC: 1000*[(13C/12C)sample - (13C/12C)standard]/ (13C/12C)standard. Reported in units of per mil.	per mil	d13C_DIC
DIC_13_D_DELTA_BOTTLE_FLAG	Quality flag for DIC_13_D_DELTA_BOTTLE. 2 = good data; 3 = questionable data; 9 = no data.	unitless	q_flag
SAMPNO	Sequential sample number within the cast (usually corresponds to bottle number).	unitless	bottle
BTLNBR	Bottle number; typically 1-24.	unitless	bottle
BTLNBR_FLAG_W	Bottle number quality flag; follows WOCE conventions. 2 = good; 3 = questionable; 4 = bad; 9 = missing data.	unitless	flag
ISO_DATETIME_UTC_START_EVENT	Date and time, formatted to the ISO 8601 standard, at the start of the sampling event, according to the event log. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z. Added from BCO-DMO EPZT master events file.	unitless	ISO_DateTime_UTC
EVENT_LAT	Latitude at the start of the event; north is positive; added from BCO-DMO EPZT master events file.	decimal degrees	lat
EVENT_LON	Longitude at the start of the event; east is positive; added from BCO-DMO EPZT master events file.	decimal degrees	lon
BTL_ISO_DATETIME_UTC	Date and time, formatted to the ISO 8601 standard, at the time of bottle firing. Format: YYYY-MM-DDTHH:MM:SS[.xx]Z. Added from BCO-DMO EPZT master events file.	unitless	ISO_DateTime_UTC
BTL_LAT	Latitude of bottle firing; north is positive. Added from BCO-DMO EPZT master events file.	decimal degrees	lat
BTL_LON	Lonitude of bottle firing; east is positive. Added from BCO-DMO EPZT master events file.	decimal degrees	lon
CTDDEPTH	CTD bottle firing depth obtained from the CTD bottle files; added from BCO-DMO EPZT master events file.	meters	depth

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