Dataset: GP15 d13C-DIC Leg 1
Deployment: RR1814

GP15 d13C-DIC Leg 1

Principal Investigator:

Paul Quay (University of Washington, UW)

BCO-DMO Data Manager:

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

Project:

Decadal trends in oceanic anthropogenic CO2 from the CLIVAR and GO-SHIP d13C datasets and in an ocean biogeochemistry model (CO2 Decadal Trends)

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

Deployment Synonyms:

GP15, GP15 Leg1, 33RR20180918, PMT, US GEOTRACES PMT

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/869609/data

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Description

Methods & Sampling

Dataset acquisition description

Niskin seawater samples were collected in 250 ml bottles and poisoned with 100 µl of mercuric chloride. In the lab, approximately 100 ml was transferred from the bottle to a bubbler attached to a high vacuum line. Samples were acidified with 1 ml of 50% phosphoric acid before stripping with He gas at 200 ml min⁻¹. CO₂ gas was collected cryogenically in a liquid nitrogen cold trap after removal of water vapor. CO₂ yield was calculated manometrically (1σ = 5 µmol kg⁻¹) before transfer to a vacuum flask for isotopic analysis.

Data Processing Description

Dataset Processing Description

Data Quality Flags:
2 = good;
3 = questionable;
4 = bad.

BCO-DMO Processing:
- renamed fields to comply with BCO-DMO naming conventions;
- converted Start_Time_UTC field to 4 digits;
- created Start_ISO_DateTime_UTC field.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1829796	NSF Division of Ocean Sciences

Instruments

Isotope-ratio Mass Spectrometer

Supplied Name: Thermo Scientific MAT253

Supplied Description:

The d13C of the CO₂ gas was measured on a Thermo Scientific MAT253 isotope ratio mass spectrometer.

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

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
Station_ID	Station number	unitless	station
Start_Date_UTC	Start date; format: MM-DD-YY	unitless	date
Start_Time_UTC	Start time (UTC); format: hhmm	unitless	time
Start_ISO_DateTime_UTC	Start date and time (UTC) in ISO8601 format: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
End_Date_UTC	End date (no data)	unitless	date
End_Time_UTC	End time (UTC) (no data)	unitless	time
Start_Latitude	Start latitude	decimal degrees North	lat
Start_Longitude	Start longitude	decimal degrees East	lon
End_Latitude	End latitude (no data)	decimal degrees North	lat
End_Longitude	End longitude (no data)	decimal degrees East	lon
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample number	unitless	sample
Sample_Depth	Maximum depth of cast	meters (m)	depth_w
Sample_Pressure	Pressure at Niskin sampling depth	millibars (mbar)	press
DIC_13_12_D_DELTA_BOTTLE_ams5is	d13C of DIC	per mille (vs PDB)	d13C_DIC
SD1_DIC_13_12_D_DELTA_BOTTLE_ams5is	One standard deviation of DIC_13_12_D_DELTA_BOTTLE_ams5is	per mille (vs PDB)	d13C_DIC
Flag_DIC_13_12_D_DELTA_BOTTLE_ams5is	Quality flag for DIC_13_12_D_DELTA_BOTTLE_ams5is. 2 = good, 3 = questionable, 4 = bad.	unitless	q_flag

Database

Contribute Data

Dataset: GP15 d13C-DIC Leg 1
Deployment: RR1814

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GP15 d13C-DIC Leg 1Deployment: RR1814

Dataset acquisition description

Dataset Processing Description

Dataset: GP15 d13C-DIC Leg 1
Deployment: RR1814