URLhttps://www.bco-dmo.org/dataset/664422
Download URLhttps://www.bco-dmo.org/dataset/664422/data/download
Media Typetext/tab-separated-values
CreatedNovember 10, 2016
ModifiedJuly 3, 2017
StateFinal no updates expected
Brief DescriptionDO of pore water from sediment gravity and push cores

Acquisition Description

Sampling took place at Dorado Outcrop off the west coast of Costa Rica in the Pacific Ocean during the R/V Atlantis cruises AT26-09 and AT26-24.  For more information about operations of this cruise see the cruise pages which contain links to cruise reports ( AT26-09AT26-24).

Dissolved oxygen (DO) was measured at-sea in pore waters from sediment gravity cores and cores collected by the submersible ALVIN with a needle-type oxygen optode inserted radially into sediment cores, following published protocols (e.g., Orcutt et al., 2013). 

Reference:

Orcutt, B. N., Wheat, C. G., Rouxel, O., Hulme, S., Edwards, K. J., Bach, W., 2013. Oxygen Consumption rates in subseafloor basaltic crust derived from a reaction transport model, Nature Comm., published 27 Sep 2013, pg. 1-8, doi:10.1038/ncomms3539.

Processing Description

The data have not been processed further.

BCO-DMO Processing Notes:

* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values replaced with no data value 'nd'
* added approximate lat/lon values for Dorado Outcrop sample site

Instruments

Alvin push cores [Push Corer]
Details

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/

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).
ALVIN needle-type oxygen optode [Dissolved Oxygen Sensor]
Details
An electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed
Details
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.

Parameters

cruise_id [cruise_id]
Details
cruise_id

Cruise identifier

cruise designation; name
core_id [core_id]
Details
core_id

Core identifier

core number/identification, to be used with ice, rock and sediment cores

sediment_depth [depth_core]
Details
sediment_depth

Depth in core sample

depth in core; mid-point of interval sampled
oxygen [O2_umol_L]
Details
oxygen

Dissolved oxygen

Oxygen; dissolved; reported in units of micromoles/liter

comment [comment]
Details
comment

Comment for core and sample depth

free text comments, may only have meaning to submitting PI

Dataset Maintainers

NameAffiliationContact
Charles Geoffrey WheatUniversity of Alaska Fairbanks (UAF)
James McManusUniversity of Akron (UAkron)
Beth N. OrcuttBigelow Laboratory for Ocean Sciences
Andrew T. FisherUniversity of California-Santa Cruz (UC Santa Cruz)
Samuel M. HulmeMoss Landing Marine Laboratories (MLML)
Charles Geoffrey WheatUniversity of Alaska Fairbanks (UAF)
Amber YorkWoods Hole Oceanographic Institution (WHOI BCO-DMO)

BCO-DMO Project Info

Project TitleDiscovery, sampling, and quantification of flows from cool yet massive ridge-flank hydrothermal springs on Dorado Outcrop, eastern Pacific Ocean
AcronymDorado Outcrop
URLhttps://www.bco-dmo.org/project/627844
CreatedNovember 30, 2015
ModifiedDecember 1, 2015
Project Description

Description from NSF award abstract:
Pristine fluids from a typical ridge-flank hydrothermal system have never been sampled, mainly because it has not been possible to locate a site of focused discharge where representative samples could be collected. The PIs have located a small basement feature, Dorado outcrop, on 23 m.y.-old seafloor on the eastern flank of the East Pacific Rise that they plan to sample to determine the fluid composition, and to assess the rate of discharge from the outcrop, so that they can quantify the chemical impact of this hydrothermal system. They plan an 18-day expedition that combines the surveying capabilities of the AUV Sentry (bathymetric, sub-bottom sonar, photo mosaics, water column anomalies) and an ocean-class vessel capable of collecting high-quality multi-beam data and CTD samples, and supporting the survey and sampling capabilities of the ROV Jason II for collection of spring and plume fluids, heat flow data, sediment push cores, and still and video photography. These data and samples will be combined hopefully to generate the first well-constrained estimates of hydrothermal flows from Dorado outcrop. This expedition will result in the collection of samples and data from a "fire hose" of ridge-flank, hydrothermal system, challenging the commonly held view that discharge from ridge flank hydrothermal systems occurs primarily from diffuse seeps.

Project Maintainers
NameAffiliationRoleContact
Charles Geoffrey WheatUniversity of Alaska Fairbanks (UAF-IMS)Principal Investigator
Andrew T. FisherUniversity of California-Santa Cruz (UC Santa Cruz)Principal Investigator
Samuel M. HulmeMoss Landing Marine Laboratories (MLML)Principal Investigator
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