Dataset: Guaymas Basin 2014 Methane
Deployment: Guaymas_2014

Porewater methane concentrations from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin in 2014

Principal Investigator:

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

Co-Principal Investigator:

Ivano Aiello (Moss Landing Marine Laboratories, MLML)

Ana Christina Ravelo (University of California-Santa Cruz, UCSC)

Contact:

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

BCO-DMO Data Manager:

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

Project:

Characterizing subseafloor life and environments in the Guaymas Basin (C-DEBI Guaymas Subseafloor Life)

RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin (RAPID Guaymas Basin)

Current State:

Final no updates expected

Version:

14 October 2016

Version Date:

2016-10-14

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/661760/data

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Description

Porewater methane concentrations from sediment cores P3, P6, P10, P11, P12 and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

Methods & Sampling

Dataset acquisition description

2 ml sediment samples were taken with cut-off syringes from freshly retrieved sediment cores, placed into 5 ml of 1 mM NaOH in 30 ml serum vials, and capped with thick rubber stoppers. Methane concentrations were measured in the laboratory of J.P. Chanton (Florida State University) according to a modified headspace technique (Magen et al. 2014). Methane isotopic composition was measured by gas chromatography coupled with mass spectrometry (Chanton and Liptay 2014).

References:
Magen, C., L.L. Lapham, J.W. Pohlman, K. Marshall, S.Bosman, M. Casso, and J.P. Chanton. 2014. A simple headspace equilibration method for measuring dissolved methane. Limnol. Oceanogr. Methods 12 637-650. doi:10.4319/lom.2014.12.637

Chanton, J., and K. Liptay. 2000. Seasonal variation in methane oxidation in a landfill cover soils as determined by an in-situ stable topic technique. Global Biogeochemical Cycles 14:51-60. doi:10.1029/1999GB900087

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- created a column for core number;
- added lat, lon, and depth for each core from the metadata form;
- replaced "n.a." with "nd" (no data);
- modified parameter names to conform with BCO-DMO naming conventions.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0939564	NSF Division of Ocean Sciences
OCE-1449604	NSF Division of Ocean Sciences

Instruments

Gas Chromatograph

Supplied Name: gas chromatography

Supplied Description:

Methane isotopic composition was measured by gas chromatography coupled with mass spectrometry (Chanton and Liptay 2014).

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)

Mass Spectrometer

Supplied Name: mass spectrometry

Supplied Description:

Methane isotopic composition was measured by gas chromatography coupled with mass spectrometry (Chanton and Liptay 2014).

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.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
core	Core identifier	unitless	core_id
lat	Latitude of sampling location; postive = north	decimal degrees	lat
lon	Longitude of sampling location; negative = west	decimal degrees	lon
depth	Water depth at sampling location	meters	depth_w
core_sample	Identifier for the core sample	unitless	sample
actual_depth	Sample depth, within the core	centimeters (cm)	depth_core
methane_mM	Methane concentration	millimolar (mM)	CH4
methane_d13C	Methane d13C signature	permille	no_bcodmo_term

Database

Contribute Data

Dataset: Guaymas Basin 2014 Methane
Deployment: Guaymas_2014

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Guaymas Basin 2014 MethaneDeployment: Guaymas_2014

Dataset acquisition description

Dataset Processing Description

Dataset: Guaymas Basin 2014 Methane
Deployment: Guaymas_2014