Dataset: Sediment pushcore porewater geochemistry from southern California seeps May 2021
Deployment: WF05-21

Sediment pushcore porewater geochemistry from southern California seeps May 2021

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/908217

Co-Principal Investigator:

Shana Goffredi (Occidental College)

Victoria J. Orphan (California Institute of Technology, Caltech)

Scientist:

John Stedman Magyar (California Institute of Technology, Caltech)

BCO-DMO Data Manager:

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

Project:

Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems (Methanosphere)

Version:

Deployment Synonyms:

WF0521

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Description

Methods & Sampling

Dataset acquisition description

Sediment pushcores were collected by a remotely-operated vehicle (ROV Doc Ricketts) from the R/V Western Flyer in May 2021 (cruise ID WF05-21) at the Del Mar Seep (32.9043, -117.7824), Santa Monica Seep Mound 800 (33.7993, -118.6465), Santa Monica Seep Mound 863 (33.7891, -118.6683), and Newport Canyon (33.5450, -117.9251). Pushcores were manually sectioned into 1- or 3-centimeter (cm) horizons using plastic rings, and porewaters were extracted using a KC Denmark squeezer. Samples for ion chromatography were frozen shipboard and thawed immediately prior to analysis. Measurements were made using a Thermo Dual Dionex Integrion HPIC ion chromatography system with either a 250-millimeter (mm) Dionex IonPac AS19-4um column (anions) with 50 mm guard column or a 250 mm Dionex IonPac CS16-4um column (cations) with a 50 mm guard column, in the Resnick Water and Environment Laboratory at the California Institute of Technology (Caltech).

Data Processing Description

Dataset Processing Description

100 microliter (uL) samples were diluted 50x in milliQ nanopure water before running. Standard curves were generated using calibration standards diluted similarly to samples, with 100 uL of 500 millimolar (mM) NaCl added to mimic typical seawater sample peak behavior. Analyte peaks were integrated and values were calculated using the standards automatically in the Chromeleon software, with manual QC to ensure regular peak shapes.

Known issues or problems:
Na and Cl are not quantitative, as the standards have an excess of each spiked in, above the upper limit of quantification. Formate values reported as 'ND' indicate they are below the LoQ but not LoD. Ca elutes near the end of the run, and occasionally is not captured in its entirety.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-2048666	NSF Division of Ocean Sciences

Instruments

Ion Chromatograph

Supplied Name: Thermo Dual Dionex Integrion HPIC ion chromatography system

Supplied Description:

Thermo Dual Dionex Integrion HPIC ion chromatography system with either a 250 mm Dionex IonPac AS19-4um column (anions) with 50 mm guard column or a 250 mm Dionex IonPac CS16-4um column (cations) with a 50 mm guard column, in the Resnick Water and Environment Laboratory at the California Institute of Technology (Caltech).

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: pushcores

Supplied Description:

Sediment pushcores were collected by ROV.

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 Doc Ricketts

Supplied Name:

Supplied Description:

ROV Doc Ricketts is operated by the Monterey Bay Aquarium Research Institute (MBARI). ROV Doc Ricketts is capable of diving to 4000 meters (about 2.5 miles). The R/V Western Flyer was the support vessel for Doc Ricketts and was designed with a center well whose floor can be opened to allow Doc Ricketts to be launched from within the ship into the water below. For a complete description see: https://www.mbari.org/technology/rov-doc-ricketts/

Instrument Type

Generic Name: ROV Doc Ricketts

Acronym: Doc Ricketts

Generic Description:

The remotely operated vehicle (ROV) Doc Ricketts is operated by the Monterey Bay Aquarium Research Institute (MBARI). ROV Doc Ricketts is capable of diving to 4000 meters (about 2.5 miles). The R/V Western Flyer is the support vessel for Doc Ricketts and was designed with a center well whose floor can be opened to allow Doc Ricketts to be launched from within the ship into the water below. For a complete description, see: https://www.mbari.org/at-sea/vehicles/remotely-operated-vehicles/rov-doc-ricketts/

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
serial	Internal Orphan Lab identifier (sample serial number)	unitless	sample
Fluoride	concentration of fluoride ion	millimolar (mM)	fluoride_ion
Acetate	concentration of acetate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	C2H3O2
Formate	concentration of formate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	CHO2
Chloride	concentration of chloride ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	chloride
Bromide	concentration of bromide ion	millimolar (mM)	bromides
Nitrate	concentration of nitrate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	NO3
Sulfate	concentration of sulfate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	SO4
Thiosulfate	concentration of thiosulfate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	S2O3
Phosphate	concentration of phosphate ion. ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	PO43-
Lithium	concentration of lithium ion (Li+). ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	Li
Sodium	concentration of sodium ion (Na+)	millimolar (mM)	Sodium_cation
Ammonium	concentration of ammonium ion (NH4+). ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	NH4
Potassium	concentration of potassium ion (K+)	millimolar (mM)	K
Magnesium	concentration of magnesium ion (Mg2+)	millimolar (mM)	Mg
Calcium	concentration of calcium ion (Ca2+). ND = below level of quantification; NOT_MEASURED = this ion was not measured for this sample.	millimolar (mM)	Calcium_2_cation
pH	pH value, measured shipboard. ND = below level of quantification; NOT_MEASURED = was not measured for this sample.	unitless	pH
Dive	Dive number of the ROV Doc Ricketts	unitless	dive_id
Lat	Latitude	decimal degrees	lat
Long	Longitude, with west longitude negative	decimal degrees	lon
Horizon	depth (cm) in sediment, measured from top of core	cenimeters (cm)	depth_core
Date_UTC	core collection date (UTC)	unitless	date
Time_UTC	core collection time (UTC)	unitless	time
Depth_m	ocean depth in meters at the sampling location	meters (m)	depth
Station	name of the sampling site	unitless	station
Sample_Name	the sample name, which is composed of the dive number and the ROV pushcore number	unitless	sample
ISO_DateTime_UTC	core collection date and time (UTC) in ISO 8601 format	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: Sediment pushcore porewater geochemistry from southern California seeps May 2021
Deployment: WF05-21

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Sediment pushcore porewater geochemistry from southern California seeps May 2021Deployment: WF05-21

Dataset acquisition description

Dataset Processing Description

Dataset: Sediment pushcore porewater geochemistry from southern California seeps May 2021
Deployment: WF05-21