Dataset: GP15 CFCs and SF6

Name: CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) from September to November 2018
Published: 2020-08-13
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.820232.1

Spatial Extent: N:56.0585 E:-151.9862 S:-20 W:-156.9628

Temporal Extent: 2018-09-24 - 2018-11-23

Project:

GEOTRACES Pacific Meridional Transect: Measurement of chlorofluorocarbons and sulfur hexafluoride (PMT CFC SF6)

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

Program:

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

Principal Investigator:

Rana A. Fine (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

Contact:

Jim Happell (University of Miami Rosenstiel School of Marine and Atmospheric Science, UM-RSMAS)

BCO-DMO Data Manager:

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

Version:

Version Date:

2020-08-13

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) from September to November 2018

Abstract:

CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruises, RR1814 and RR1814 (GP15), on the R/V Roger Revelle from September to November 2018.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2020-08-13	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.820232.1	2020-08-13

Description

CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruises, RR1814 and RR1814 (GP15), on the R/V Roger Revelle from September to November 2018.

Methods & Sampling

Samples were taken from Niskin bottles. They were unfiltered. Note there is no SF6 data for the first leg of the cruise (RR1814).

Procedures:
Fill 300 ml and flush BOD bottles with water in a one liter overflow bottle. Cap bottle underwater. Analysis is on a custom-built purge and trap gas chromatography with electron capture detection. Data were processed using Labview and Excel.

Data Processing Description

BCO-DMO Processing:
- renamed parameters;
- added date/time field in ISO8601 format;
- replaced "-99" with "nd" ("no data");
- rounded CFC_12_D_CONC_BOTTLE and CFC_11_D_CONC_BOTTLE values to 4 decimal places.

Data Files

File
CFC_SF6.csv (Comma Separated Values (.csv), 112.18 KB) MD5:0741ad7ee2c7120ea4c4db7efab9c1fc Primary data file for dataset ID 820232

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1737041

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1814	GP15 GP15 Leg1 33RR20180918 PMT US GEOTRACES PMT	2018-09-18	R/V Roger Revelle	Gregory A. Cutter (Chief Scientist) Karen L. Casciotti (Co-Chief Scientist) Phoebe J. Lam (Co-Chief Scientist)	data info
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

Automated Purge and Trap System

Supplied Name: custom-built purge and trap gas chromatography with electron capture detection

Supplied Description:

Instrument Type

Generic Name: Automated Purge and Trap System

Generic Description:

This equipment removes dissolved gases from the water samples, traps the extracted compounds on a cold trap and then heats the trap and injects the trapped gases into the gas chromatograph. It is automated and controlled by a laptop computer.

Gas Chromatograph

Supplied Name: custom-built purge and trap gas chromatography with electron capture detection

Supplied Description:

Instrument Type

Generic Name: Gas Chromatograph

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/

Generic Description:

Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)

Niskin bottle

Supplied Name:

Supplied Description:

Samples were taken from Niskin bottles. They were unfiltered.

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
STNNBR	Station number	unitless	station
CASTNO	Cast number	unitless	cast
SAMPNO	Sample bottle number	unitless	bottle
BTLNBR	Bottle number	unitless	bottle
BTLNBR_FLAG_W	Bottle quality flag; see WHP quality codes for the water bottle itself	unitless	q_flag
GEOTRC_EVENTNO	Event number	unitless	event
GEOTRC_SAMPNO	GEOTRACES sample number	unitless	sample
DATE	Date; format: YYYYMMDD	unitless	date
TIME	Time; format: hh:mm	unitless	time
ISO_DateTime_UTC	Sampling date and time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
LATITUDE	Latitude	decimal degrees North	lat
LONGITUDE	Longitude	decimal degrees East	lon
DEPTH	Bottom depth	meters (m)	depth_w
CTDPRS	Sample/sensor pressure from CTD	decibars	press
CTDTMP	Temperature from CTD sensor in the ITS-90 convention	degrees Celsius	temp
CTDSAL	Practical salinity from CTD sensor on the PSS-1978 scale	psu	sal
SF6_D_CONC_BOTTLE	SF6 concentration	femtomole/kg (fmol/kg)	SF6
SF6_D_CONC_BOTTLE_FLAGW	WOCE data quality flag for SF6_D_CONC_BOTTLE	unitless	q_flag
CFC_12_D_CONC_BOTTLE	CFC-12 concentration	picomole/kg (pmol/kg)	CFC-12
CFC_12_D_CONC_BOTTLE_FLAGW	WOCE data quality flag for CFC_12_D_CONC_BOTTLE	unitless	q_flag
CFC_11_D_CONC_BOTTLE	CFC-11 concentration	picomole/kg (pmol/kg)	CFC-11
CFC_11_D_CONC_BOTTLE_FLAGW	WOCE data quality flag for CFC_11_D_CONC_BOTTLE	unitless	q_flag

Status message

Database

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Dataset: GP15 CFCs and SF6