Dataset: BASIN 2019 Porewater geochemistry

Name: Porewater geochemistry of sediments collected Fall 2019 in the Santa Barbara Basin using ROV Jason during R/V Atlantis cruise AT42-19
Published: 2021-12-23
Keywords: Santa Barbara Basin, sediments, porewater, geochemistry, oceans

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Cite This Dataset

DOI:10.26008/1912/bco-dmo.867007.1

Spatial Extent: N:34.36270433 E:-120.0147509 S:34.14209313 W:-120.1164661

Temporal Extent: 2019-10-31 - 2019-11-09

Project:

Collaborative Research: Do benthic feedbacks couple sulfur, nitrogen and carbon biogeochemistry during transient deoxygenation? (BASIN)

Principal Investigator:

Tina Treude (University of California-Los Angeles, UCLA)

Co-Principal Investigator:

David L. Valentine (University of California-Santa Barbara, UCSB)

Contact:

Tina Treude (University of California-Los Angeles, UCLA)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-12-23

Restricted:

Yes

Release Date:

2022-12-31

Validated:

Yes

Current State:

Final no updates expected

Porewater geochemistry of sediments collected Fall 2019 in the Santa Barbara Basin using ROV Jason during R/V Atlantis cruise AT42-19

Abstract:

Sediments were collected in Fall 2019 across three transects in the Santa Barbara Basin using the ROV Jason during R/V Atlantis cruise AT42-19. Porewater was separated from the sediments and geochemical properties measured.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-12-23	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.867007.1	2022-02-08

Methods & Sampling

Sediments were collected with push cores (6 cm inner diameter) along three depth transects across the Santa Barbara Basin using the ROV Jason. Porewater was separated from sediment by centrifugation (4300 x g for 20 mins) in anoxic centrifugation vials and subsampled for further analysis.

Porewater geochemical properties were determined as listed:

Porewater sulfate concentrations were determined by ion chromatography (Metrohm 761).
Porewater sulfide concentrations were determined spectrophotometrically (Shimadzu UV-Spectrophotometer UV-1800) according to Cline (1969).
Porewater ammonium, iron (II), and phosphate concentrations were determined spectrophotometrically (Shimadzu UV-Spectrophotometer UV-1800) according to Grasshoff et al. (1999).
Porewater nitrate and nitrite concentrations were determined spectrophotometrically (Shimadzu UV-Spectrophotometer UV-1800) according to García-Robledo et al. (2014).
Porewater Total Alkalinity was determined by titration according to Dale et al. 2015. Porewater Dissolved Inorganic Carbon was determined using a flow injection system (Hall & Aller 1992).

Note: Negative depths refer to measurements in the sediment core supernatant water. Supernatant water was collected with an anoxic syringe prior to core slicing.

Data Processing Description

BCO-DMO Data Processing
- Imported data from source file "Treude_Valentine_BASIN_2019_datasets_BCO-DMO.xlsx" into the BCO-DMO processing tool
- Combined data from multiple stations into a single file
- Separated data for porewater, microbial, and sediment into individual tables
- Modified parameter (column) names to conform with BCO-DMO naming conventions
The only allowed characters are A-Z,a-z,0-9, and underscores
No spaces, hyphens, commas, parentheses, or Greek letters
- Added column for Cruise
- Changed date format from m/d/yyyy to yyyy-mm-dd (ISO Date 8601 format)
- Added conventional header with dataset name, PI name, version date

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1830033
NSF Division of Ocean Sciences	OCE-1829981

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AT42-19	BASIN 2019 BASIN19	2019-10-29	R/V Atlantis	David L. Valentine (Chief Scientist)	data info

Instruments

Centrifuge

Supplied Name: centrifuge

Supplied Description:

Porewater was separated from sediment by centrifugation (4300 x g for 20 mins) in anoxic centrifugation vials and subsampled for further analysis.

Instrument Type

Generic Name: Centrifuge

Generic Description:

A machine with a rapidly rotating container that applies centrifugal force to its contents, typically to separate fluids of different densities (e.g., cream from milk) or liquids from solids.

Flow Injection Analyzer

Supplied Name: flow injection system

Supplied Description:

Porewater Dissolved Inorganic Carbon was determined using a flow injection system (Hall & Aller 1992).

Instrument Type

Generic Name: Flow Injection Analyzer

Acronym: FIA

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB36/

Generic Description:

An instrument that performs flow injection analysis. Flow injection analysis (FIA) is an approach to chemical analysis that is accomplished by injecting a plug of sample into a flowing carrier stream. FIA is an automated method in which a sample is injected into a continuous flow of a carrier solution that mixes with other continuously flowing solutions before reaching a detector. Precision is dramatically increased when FIA is used instead of manual injections and as a result very specific FIA systems have been developed for a wide array of analytical techniques.

Gravity Corer

Supplied Name: Gravity Core

Supplied Description:

Instrument Type

Generic Name: Gravity Corer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/51/

Generic Description:

The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. (http://www.whoi.edu/instruments/viewInstrument.do?id=1079).

Ion Chromatograph

Supplied Name: Metrohm 761

Supplied Description:

Porewater sulfate concentrations were determined by ion chromatography (Metrohm 761).

Instrument Type

Generic Name: Ion Chromatograph

Generic Description:

Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. (from http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html)

Push Corer

Supplied Name: ROV push cores

Supplied Description:

Sediments were collected with push cores (6 cm i.d.) along three depth transects across the Santa Barbara Basin using the ROV Jason.

Instrument Type

Generic Name: Push Corer

Generic Description:

Capable of being performed in numerous environments, push coring is just as it sounds. Push coring is simply pushing the core barrel (often an aluminum or polycarbonate tube) into the sediment by hand. A push core is useful in that it causes very little disturbance to the more delicate upper layers of a sub-aqueous sediment.

Description obtained from: http://web.whoi.edu/coastal-group/about/how-we-work/field-methods/coring/

ROV Jason

Supplied Description:

Sediments were collected with push cores in the Santa Barbara Basin using the ROV Jason.

Instrument Type

Generic Name: ROV Jason

Generic Description:

The Remotely Operated Vehicle (ROV) Jason is operated by the Deep Submergence Laboratory (DSL) at Woods Hole Oceanographic Institution (WHOI). WHOI engineers and scientists designed and built the ROV Jason to give scientists access to the seafloor that didn't require them leaving the deck of the ship. Jason is a two-body ROV system. A 10-kilometer (6-mile) fiber-optic cable delivers electrical power and commands from the ship through Medea and down to Jason, which then returns data and live video imagery. Medea serves as a shock absorber, buffering Jason from the movements of the ship, while providing lighting and a bird’s eye view of the ROV during seafloor operations. During each dive (deployment of the ROV), Jason pilots and scientists work from a control room on the ship to monitor Jason’s instruments and video while maneuvering the vehicle and optionally performing a variety of sampling activities. Jason is equipped with sonar imagers, water samplers, video and still cameras, and lighting gear. Jason’s manipulator arms collect samples of rock, sediment, or marine life and place them in the vehicle’s basket or on "elevator" platforms that float heavier loads to the surface. More information is available from the operator site at URL.

UV Spectrophotometer-Shimadzu

Supplied Name: Shimadzu UV-Spectrophotometer UV-1800

Supplied Description:

Shimadzu UV-Spectrophotometer UV-1800 was used to determine porewater sulfide, ammonum, iron(II), phosphate, nitrate, and nitrite concentrations

Instrument Type

Generic Name: UV Spectrophotometer-Shimadzu

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

The Shimadzu UV Spectrophotometer is manufactured by Shimadzu Scientific Instruments (ssi.shimadzu.com). Shimadzu manufacturers several models of spectrophotometer; refer to dataset for make/model information.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise ID	unitless	cruise_id
Location	Sampling and cruise location	unitless	region
Latitude	Latitude of sample collection	decimal degrees	lat
Longitude	Longitude of sample collection; west is negative	decimal degrees	lon
ISO_DateTime_UTC	Date and time in ISO8601 standard format (YYYY-MM-DDThh:mm:ssZ) Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
Station	Station	unitless	station
Water_Depth	Water depth at sampling location	meters (m)	depth
Sampling_Instrument	Sampling instrument used to obtain sediments	unitless	instrument
Sediment_Depth	Depth of sediment core	centimeters (cm)	depth_bsf
Total_Alkalinity	Total alkalinity concentration in porewater	millimole per liter (mmol/L)	TALK
DIC	Dissolved inorganic carbon concentration in porewater	millimole per liter (mmol/L)	DIC
Iron_II	Iron (II) concentration in porewater	micromole per liter (µmol/L)	Fe
Total_Sulfide	Total sulfide concentration in porewater	micromole per liter (µmol/L)	sulfide
Sulfate	Sulfate concentration in porewater	millimole per liter (mmol/L)	SO4
Ammonium	Ammonium ion concentration in porewater	micromole per liter (µmol/L)	NH4
Nitrate	Nitrate concentration in porewater	micromole per liter (µmol/L)	NO3
Nitrite	Nitrite concentration in porewater	micromole per liter (µmol/L)	NO2
Phosphate	Phosphate concentration in porewater	micromole per liter (µmol/L)	PO43-

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Dataset: BASIN 2019 Porewater geochemistry