Dataset: GP16 CFC and SF6
Deployment: TN303

CFC-12, CFC-11, CFC-113, and SF6 concentration from US GEOTRACES EPZT cruise.

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)

Project:

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

Current State:

Final no updates expected

Version:

24 July 2017

Deployment Synonyms:

GP16, GEOTRACES EPZT, GEOTRACES East Pacific Zonal Transect (EPZT), GT13, 325020131025

Version Date:

2017-07-24

Data URL:

https://www.bco-dmo.org/dataset-deployment/679309/data

Expand/Collapse All

Description

CFC-12, CFC-11, CFC-113, and SF6 concentration from US GEOTRACES EPZT cruise. This dataset supercedes the values reported in the bottle file.

Methods & Sampling

Dataset acquisition description

Niskin samples: Samples were collected in 300 ml BOD bottles from the 30 liter Niskins and then analyzed via purge and trap capillary column gas chromatography with electron capture detection.

Underway samples: The ships underway system was directly plumbed to the CFC/SF6 system, so that that water sample fixed volume sample loop could be filled directly from the flowing water. Analysis was then carried out as it was from the bottle collected from the Niskins.

Data Processing Description

Dataset Processing Description

CFC and SF6 concentrations were calculated from standard calibration curves and corrected for analytical blanks, and detector response drift with time. There is no flag for values below the detection limit.

BCO-DMO Processing:
- parameter names were modified to conform with GEOTRACES and BCO-DMO naming conventions;
- 07 July 2017: added GEOTRC_SAMPNO to all samples by joining by STNNBR, CASTNO, and SAMPNO except for the underway samples where there some ambiguous sampling events where the GEOTRC_SAMPNO cannot be determined based on the provided information from the PI.
- 12 July 2017: removed sample erroneously included in dataset (was labeled as 9497).
- 24 July 2107: created separate columns for bottle and underway samples to be in compliance with GEOTRACES naming conventions.

More information about this dataset deployment

Instruments

Gas Chromatograph

Supplied Name:

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:

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

Supplied Name	Supplied description	Supplied Units	Standard Name
STNNBR	Station number	unitless	station
bottle_num	Sample/bottle number. Combination of CASTNO and Niskin bottle number (e.g. 201 = cast 2, bottle 1).	unitless	bottle
CFC12_BOTTLE	CFC-12 concentration for samples collected by Niskin bottle	picomoles per kilogram (pmol/kg)	CFC-12
CFC12_BOTTLE_FLAG_W	WOCE quality flag for CFC-12 samples collected by Niskin bottle	unitless	q_flag
CFC11_BOTTLE	CFC-11 concentration for samples collected by Niskin bottle	picomoles per kilogram (pmol/kg)	CFC-11
CFC11_BOTTLE_FLAG_W	WOCE quality flag for CFC-11 samples collected by Niskin bottle	unitless	q_flag
CFC113_BOTTLE	CFC-113 concentration for samples collected by Niskin bottle	picomoles per kilogram (pmol/kg)	no_bcodmo_term
CFC113_BOTTLE_FLAG_W	WOCE quality flag for CFC-113 samples collected by Niskin bottle	unitless	q_flag
SF6_BOTTLE	SF6 concentration for samples collected by Niskin bottle	femtomoles per kilogram (fmol/kg)	SF6
SF6_BOTTLE_FLAG_W	WOCE quality flag for SF6 samples collected by Niskin bottle	unitless	q_flag
cruise_id	Cruise identification	unitless	cruise_id
CASTNO	Cast number; field created from the original bottle_num column.	unitless	cast
GEOTRC_EVENTNO	GEOTRACES event number; joined from BCO-DMO EPZT master file.	unitless	event
GEOTRC_INSTR	Sampling instrument; joined from BCO-DMO EPZT master file.	unitless	instrument
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; joined from BCO-DMO EPZT master file.	unitless	ISO_DateTime_UTC
EVENT_LAT	Latitude at the start of the event; north is positive. Joined from BCO-DMO EPZT master file.	decimal degrees	lat
EVENT_LON	Longitude at the start of the event; east is positive. Joined from BCO-DMO EPZT master file.	decimal degrees	lon
SAMPNO	Sequential sample number within the cast (usually corresponds to bottle number). Created from original bottle_num column.	unitless	bottle
GEOTRC_SAMPNO	Unique GEOTRACES sample number; joined from BCO-DMO EPZT master file using combination of STNNBR, CASTNO, and SAMPNO.	unitless	sample
BTLNBR	Bottle number; typically 1-24. Joined from BCO-DMO EPZT master file.	unitless	bottle
BTLNBR_FLAG_W	Bottle number quality flag; follows WOCE conventions. 2 = no problems noted; 3 = leaking; 4 = did not trip correctly; 9 = samples not drawn from this bottle. Joined from BCO-DMO EPZT master file.	unitless	flag
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. Joined from BCO-DMO EPZT master file.	unitless	ISO_DateTime_UTC
CTDPRS	CTD pressure; joined from BCO-DMO EPZT master file.	decibars	press
CTDDEPTH	CTD bottle firing depth; joined from BCO-DMO EPZT master file.	meters	depth
CFC12_UWAY	CFC-12 concentration for samples collected by the underway system	picomoles per kilogram (pmol/kg)	CFC-12
CFC12_UWAY_FLAG_W	WOCE quality flag for CFC-12 samples collected by the underway system	unitless	q_flag
CFC11_UWAY	CFC-11 concentration for samples collected by the underway system	picomoles per kilogram (pmol/kg)	CFC-11
CFC11_UWAY_FLAG_W	WOCE quality flag for CFC-11 samples collected by the underway system	unitless	q_flag
CFC113_UWAY	CFC-113 concentration for samples collected by the underway system	picomoles per kilogram (pmol/kg)	no_bcodmo_term
CFC113_UWAY_FLAG_W	WOCE quality flag for CFC-113 samples collected by the underway system	unitless	q_flag
SF6_UWAY	SF6 concentration for samples collected by the underway system	femtomoles per kilogram (fmol/kg)	SF6
SF6_UWAY_FLAG_W	WOCE quality flag for SF6 samples collected by the underway system	unitless	q_flag

Database

Contribute Data

Dataset: GP16 CFC and SF6
Deployment: TN303

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GP16 CFC and SF6Deployment: TN303

Dataset acquisition description

Dataset Processing Description

Dataset: GP16 CFC and SF6
Deployment: TN303