Dataset: AT37-06 Sediment geochemistry

Name: Sediment geochemistry from push cores collected during HOV Alvin dives during the R/V Atlantis cruise AT37-06 in Guaymas Basin, Gulf of California in December 2016
Published: 2020-07-21
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.814391.1

Spatial Extent: N:27.46667 E:-111.38417 S:27.00733 W:-111.47317

Temporal Extent: 2016-12-18 - 2016-12-26

Project:

Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)

Principal Investigator:

Samantha B. Joye (University of Georgia, UGA)

Co-Principal Investigator:

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

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2020-07-21

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Sediment geochemistry from push cores collected during HOV Alvin dives during the R/V Atlantis cruise AT37-06 in Guaymas Basin, Gulf of California in December 2016

Abstract:

Sediment geochemistry from push cores obtained using the human-occupied deep-diving vehicle (HOV) Alvin dives 4867-4872 during the R/V Atlantis cruise AT37-06 in Guaymas Basin, Gulf of California (27 00.00 N, -111 20.00 W) in December 2016. These data were published in (Zhuang et al., 2018).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2020-07-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.814391.1	2020-12-09
2020-07-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.814391.1	2020-12-09

Methods & Sampling

Methodology:

Sediment samples were collected from hydrothermal areas of Guaymas Basin in the Gulf of California during cruise AT3706 of R/V Atlantis in December 2016. Push cores were obtained using the human-occupied deep diving vehicle Alvin during dives 4867 to 4872. Porewater was extracted from the sediment by centrifugation and then filtered through a 0.2 μm syringe filter. Samples for quantification of concentrations of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), volatile fatty acids and alcohols were immediately frozen and stored at −20 °C or −80 °C (i.e. alcohols) before analysis.

Instruments:

The in situ temperature in the sediment was measured with Alvin’s external heatflow probe (McKay et al., 2012). DIC was measured with: Shimadzu Instruments GC-2014 Gas Chromatograph with FID Detector and Methanizer. The concentration of DOC was measured with a Shimadzu TOC-V equipped with a nondispersive infrared detector (Joye et al., 2004). The concentrations and stable carbon isotopic compositions of VFAs were analyzed by a liquid chromatography coupled to isotope ratio mass spectrometry (DELTA Plus XP IRMS) via a LC Isolink interface (ThermoFinnigan) (Heuer et al., 2006). Methanol and Ethanol were measured with: a purge and trap system connected to an SRI Instruments 8610C Gas Chromatograph with FID Detector.

Issues of note:

Due to the limited volume of porewaters, methanol and ethanol were not determined for most of the samples collected from Dives 4867 to Dive 4870.

Missing data identifiers:
* B.D.: Below detection limit.
* nd：Not determined. nd is the default missing data identifier in the BCO-DMO data system.

Data Processing Description

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions (spaces, +, and - changed to underscores). Units in parentheses removed and added to Parameter Description metadata section.
* Data submitted in Excel file "Data submission OCE.xlsx" sheet "Geochemistry" extracted to csv
* The defualt missing identifier in the original file N.D. for "not determined" is displayed as "nd" in the data. nd is the default missing data identifier in the BCO-DMO system.
* removed metadata notes at the bottom of the file and moved to parameter descriptions. E.g. "B.D.: Below detection limit."
* Date formats converted to ISO 8601 yyyy-mm-dd
* Lat/lon converted to decimal degrees from degrees decimal minutes

Data Files

File
geochem.csv (Comma Separated Values (.csv), 5.67 KB) MD5:a7bc2c7844f0056f78cb56c80a13f133 Primary data file for dataset ID 814391

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1357360

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AT37-06		2016-12-09	R/V Atlantis	Andreas Teske (Chief Scientist)	data info
AT37-06_Alvin_Dives		2016-12-09	Alvin	Andreas Teske (Chief Scientist)	data info

Instruments

Gas Chromatograph

Supplied Name: Shimadzu Instruments GC-2014

Supplied Description:

DIC was measured with Shimadzu Instruments GC-2014 Gas Chromatograph with FID Detector and Methanizer.

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)

Gas Chromatograph

Supplied Name: SRI Instruments 8610C

Supplied Description:

Methanol and Ethanol were measured with: a purge and trap system connected to an SRI Instruments 8610C Gas Chromatograph with FID Detector.

Instrument Type

Generic Name: Gas Chromatograph

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

Generic Description:

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Dive_No	Dive number	unitless	dive_id
Site	Site name	unitless	site
Sampling_date	Sample date (UTC) in ISO 8601 format yyyy-mm-dd	unitless	date_utc
Latitude	Latitude	decimal degrees	lat
Longitude	Longitude	decimal degrees	lon
Depth1	Sediment sampling depth	centimeters (cm)	depth_core
DIC	Porewater concentrations of dissolved inorganic carbon	millimoles per liter (mmol/L)	DIC
DOC	Porewater concentrations of dissolved organic carbon	micromoles per liter (umol/L)	DOC
Formate	Porewater concentrations of formate	micromoles per liter (umol/L)	no_bcodmo_term
d13C_Formate	Stable carbon isotopic composition of formate	permil (0/00)	no_bcodmo_term
Acetate	Porewater concentrations of acetate	micromoles per liter (umol/L)	no_bcodmo_term
d13C_Acetate	Stable carbon isotopic composition of formate	permil (0/00)	no_bcodmo_term
Lactate	Porewater concentrations of lactate	micromoles per liter (umol/L)	no_bcodmo_term
d13C_Lactate	Stable carbon isotopic composition of lactate	permil (0/00)	no_bcodmo_term
Methanol	Porewater concentrations of methanol	micromoles per liter (umol/L)	no_bcodmo_term
Ethanol	Porewater concentrations of ethanol	micromoles per liter (umol/L)	no_bcodmo_term
Depth2	Temperature Sampling depth	centimeters (cm)	no_bcodmo_term
Temperature	Sediment temperature	degrees Celsius	temp

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Database

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Dataset: AT37-06 Sediment geochemistry