URL | https://www.bco-dmo.org/dataset/671260 |
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Download URL | https://www.bco-dmo.org/dataset/671260/data/download |
Media Type | text/tab-separated-values |
Created | December 27, 2016 |
Modified | July 3, 2017 |
State | Final no updates expected |
Brief Description | Pore fluid chemistry from gravity cores |
Acquisition Description
Gravity core sampling took place at Dorado Outcrop off the west coast of Costa Rica in the Pacific Ocean during the R/V Atlantis cruise AT26-24. For more information about operations of this cruise see the cruise page which contains a link to the cruise report (AT26-24).
Phosphate, N+N, silicate, and NH4, were all run at Oregon State University using standard colorimetric techniques. Dissolved inorganic carbon (DIC) was run at Oregon State University using coulometry. Remaining elements were analyzed using Inductively Coupled Plasma Optical Emission Spectrophotometer (ICPOES). Comparison of Si measured via the two techniques shows an offset with the colorimetric results being ~7 uM higher than the ICP-OES results.
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
* BD indicates Below Detection
* blank values replaced with no data value ‘nd’
* added ,dive_date, dive_lat, dive_lon from information in the cruise report (Table 4)
Instruments
Also referred to as an Inductively coupled plasma atomic emission spectroscope (ICP-AES). These instruments pass nebulised samples into an inductively-coupled gas plasma (8-10000 K) where they are atomised and excited. The de-excitation optical emissions at characteristic wavelengths are spectroscopically analysed. It is often used in the detection of trace metals.
Parameters
Depth below sea floor of sample
depth below seafloor. Includes mbsf (meters below seafloor) and cmbsf (centimeters below seafloor).
Gravity core identifier
Core identification number or label; often used with ice, rock, sediment, or coral cores.
date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)
Alvin submersible dive latitude; north is positive
latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes
Alvin submersible dive longitude; east is positive
longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes
Orthophosphate (phosphate, reactive phosphorus), Various units.
Nitrate and Nitrite, µM (micromolar) or µg-at NO3-N and NO2-N/l
Silicate (Orthosilicic Acid), Si(OH)4, uM (micromolar) or ug-at Si(OH)4-Si/l (colloquially known as 'silicate') [Note: this parameter name was redefined to remove the parentheses.)
Ammonium and ammonia concentration parameters in any body of fresh or salt water.
Stable carbon isotope ratio of dissolved inorganic carbon (13C/12C ratio in DIC).
Stable carbon isotope ratio of dissolved inorganic carbon (13C/12C ratio in DIC).
Delta 13C (d13C) is the ratio of stable isotopes 13C:12C, reported in parts per thousand (per mil, 0/00).
Ba (Barium). May be reported in parts per million, nanomoles per Liter, or other units. Refer to dataset metadata for units.
B (Boron) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
Manganese (Mn). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
Iron (Fe). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
Silicon (Si). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
Sr (Strontium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
Concentration of a trace element in seawater. Does not include trace metals and metaloids. Refer to dataset for element name and units.
Sodium (Na). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
Calcium (Ca). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
Mg (magnesium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
K (potassium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
Dataset Maintainers
Name | Affiliation | Contact |
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Charles Geoffrey Wheat | University of Alaska Fairbanks (UAF) | ✓ |
James McManus | University of Alaska Fairbanks (UAF) | ✓ |
Beth N. Orcutt | University of Akron (UAkron) | |
Andrew T. Fisher | University of Akron (UAkron) | |
Samuel M. Hulme | Bigelow Laboratory for Ocean Sciences | |
Amber York | University of California-Santa Cruz (UC Santa Cruz) | |
Amber York | University of California-Santa Cruz (UC Santa Cruz) | |
Samuel M. Hulme | Moss Landing Marine Laboratories (MLML) | |
Samuel M. Hulme | Moss Landing Marine Laboratories (MLML) | |
Amber York | Woods 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 |
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Acronym | Dorado Outcrop |
URL | https://www.bco-dmo.org/project/627844 |
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
Name | Affiliation | Role |
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Charles Geoffrey Wheat | University of Alaska Fairbanks (UAF-IMS) | Principal Investigator |
Andrew T. Fisher | University of California-Santa Cruz (UC Santa Cruz) | Principal Investigator |
Samuel M. Hulme | Moss Landing Marine Laboratories (MLML) | Principal Investigator |