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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:
Note: Negative depths refer to measurements in the sediment core supernatant water. Supernatant water was collected with an anoxic syringe prior to core slicing.
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
Porewater was separated from sediment by centrifugation (4300 x g for 20 mins) in anoxic centrifugation vials and subsampled for further analysis.
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.
Porewater Dissolved Inorganic Carbon was determined using a flow injection system (Hall & Aller 1992).
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.
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).
Porewater sulfate concentrations were determined by ion chromatography (Metrohm 761).
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)
Sediments were collected with push cores (6 cm i.d.) along three depth transects across the Santa Barbara Basin using the ROV Jason.
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/
Sediments were collected with push cores in the Santa Barbara Basin using the ROV Jason.
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.
Shimadzu UV-Spectrophotometer UV-1800 was used to determine porewater sulfide, ammonum, iron(II), phosphate, nitrate, and nitrite concentrations
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.
Cruise ID
Sampling and cruise location
Latitude of sample collection
Longitude of sample collection; west is negative
Date and time in ISO8601 standard format (YYYY-MM-DDThh:mm:ssZ)
Station
Water depth at sampling location
Sampling instrument used to obtain sediments
Depth of sediment core
Total alkalinity concentration in porewater
Dissolved inorganic carbon concentration in porewater
Iron (II) concentration in porewater
Total sulfide concentration in porewater
Sulfate concentration in porewater
Ammonium ion concentration in porewater
Nitrate concentration in porewater
Nitrite concentration in porewater
Phosphate concentration in porewater
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