Download URLhttps://www.bco-dmo.org/dataset/664422/data/download
Media Type text/tab-separated-values
Created November 10, 2016
Modified July 3, 2017
State Final no updates expected
Brief Description

DO 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). 


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


Alvin push cores [Push Corer]

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]
An electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed
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.


cruise_id [cruise_id]

Cruise identifier

cruise designation; name
lat_approx [latitude]

Approximate latitude of Dorado Outcrop

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

lon_approx [longitude]

Approximate longitude of Dorado Outcrop

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes

core_id [core_id]

Core identifier

Core identification number or label; often used with ice, rock, sediment, or coral cores.

sediment_depth [depth_core]

Depth in core sample

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

Dissolved oxygen

Oxygen; dissolved; reported in units of micromoles/liter

comment [comment]

Comment for core and sample depth

free text comments, may only have meaning to submitting PI

Dataset Maintainers

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

BCO-DMO Project Info

Project Title Discovery, sampling, and quantification of flows from cool yet massive ridge-flank hydrothermal springs on Dorado Outcrop, eastern Pacific Ocean
Acronym Dorado Outcrop
Created November 30, 2015
Modified December 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.

Data Project Maintainers
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