Dataset: Sediment delta-13C methane and methane concentrations
Deployment: AT42-05_Alvin_Dives

sediment methane

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/825169

Principal Investigator:

Virginia P. Edgcomb (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Andreas Teske (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Hydrothermal Fungi in the Guaymas Basin Hydrocarbon Ecosystem (HOTFUN)

Version:

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Description

Sediment delta-13C methane and concentrations from pushcore samples collected at Guaymas Basin hydrothermal vents via Alvin dives on RV/Atlantis cruise AT42-05, Nov. 2018.

Methods & Sampling

Dataset acquisition description

Alvin pushcores dedicated to hydrocarbon and methane analyses were sectioned to recover the 0-6cm, 6-12, and 12-18cm fractions, or the 0-10, 10-20, and 20-30cm fractions. 7 ml of sediment from each horizon was sampled for methane concentration and isotopic 13C methane analysis. The samples were collected at 10 ml serum vials and treated with 2.8 ml of NaOH 1M. The serum vials were sealed with black stoppers and stored inverted at -20oC

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- data submitted in Excel files "DATASET_HOTFUN_13C_methane.xlsx" and "DATASET_HOTFUN_methane concentrations.xlsx" were joined and extracted to csv
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- converted date from mm-ddd-yy to yyyy-mm-dd
- split lat and lon into separate columns and converted from degrees decimal minutes to decimal degrees
- removed extra hyphen from Sample_ID 617-14 for consistency and joining

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1829680	NSF Division of Ocean Sciences

Instruments

Alvin tube core

Supplied Name: Alivn pushcore

Supplied Description:

Instrument Type

Generic Name: Alvin tube core

Acronym: Tube Core

Generic Description:

A plastic tube, about 40 cm (16 inches) long, is pushed into the sediment by Alvin's manipulator arm to collect a sediment core.

Gas Chromatograph

Supplied Name: Agilent 6890 gas chromatograph and an Hewlett Packard 5890 gas chromatograph with an FID detector

Supplied Description:

Used to measure carbon isotopes (Agilent) and to measure methane concentrations (HP 5890)

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)

Isotope-ratio Mass Spectrometer

Supplied Name: Thermo Finnigan Delta plusXL Isotope Ratio Mass Spectrometer

Supplied Description:

Used to measure carbon isotopes.

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).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Site	sampling site	unitless	site
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is postivie	decimal degrees	lon
Sampling_Date	sampling date (UTC); formatted as yyyy-mm-dd	unitless	date
Alvin_Dive	Alvin dive number	unitless	dive_id
core	Alvin pushcore identifier	unitless	core_id
Sample_ID	sample identifier	unitless	sample
methane_conc	methane concentration	mmol/ul/gr of wet sediment	CH4
methane_conc_stdev	methane concentration standard deviation	mmol/ul/gr of wet sediment	CH4
d13C_CH4	13C to 12C ratio of methane	per mil (o/oo)	d13C
d13C_CH4_stdev	13C to 12C ratio of methane standard deviation	per mil (o/oo)	d13C

Database

Contribute Data

Dataset: Sediment delta-13C methane and methane concentrations
Deployment: AT42-05_Alvin_Dives

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Sediment delta-13C methane and methane concentrationsDeployment: AT42-05_Alvin_Dives

Dataset acquisition description

Dataset Processing Description

Dataset: Sediment delta-13C methane and methane concentrations
Deployment: AT42-05_Alvin_Dives