| URL | https://www.bco-dmo.org/dataset/664454 |
|---|---|
| Download URL | https://www.bco-dmo.org/dataset/664454/data/download |
| Media Type | text/tab-separated-values |
| Created | November 10, 2016 |
| Modified | July 3, 2017 |
| State | Final no updates expected |
| Brief Description | Chemistry from discrete samples of hydrothermal springs |
Syringe samples of hydrothermal water were collected during Alvin dives.
The Alvin dives were conducted off the west coast of Costa Rica in the Pacific Ocean at Dorado Outcrop during the R/V Atlantis cruise AT26-24. For more information about operations of this cruise see the cruise pages which contain links to cruise reports (AT26-24)
Chemical Measurements:
All fluids were measured using established standard protocols. At sea, alkalinity was determined potentiometrically via titration with 0.1N hydrochloric acid; a pH measurement is conducted as part of this procedure. An Inductively Coupled Plasma Optical Emission Spectrophotometer (ICPOES) was used to measure Na, K, Sr, Li, Mg, Ca, and S with a 1:200 dilution and Sr, Li, Fe, Mn, and B with a 1:25 dilution in 1% nitric acid. An inductively coupled plasma mass spectrometry (ICP-MS) was used to analyze Rb, Cs, Ba, Mo, V and U with a 1:75 dilution in 3% nitric acid. Nutrients (silicate, phosphate, total nitrogen and nitrate) were measured at Oregon State University using standard colorimetric, automated, segmented flow procedures. Chlorinity was determined potentiometrically via titration with silver nitrate. Carbon analyses were conducted at Oregon State University
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
* added lat, lon, and date of Alvin dives as listed in the Alvin Dive Log
A device that collects an in-situ discrete water sample from any depth and returns it to the surface without contamination by the waters through which it passes, such as a water bottle.
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.
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
Sample identifier
unique sample identification or number; any combination of alpha numeric characters; precise definition is file dependent
Dissolved Inorganic Carbon
Dissolved Inorganic Carbon
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).
Molybdenum (Mo). Concentrations may be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.
V (Vanadium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
A measure of chloride content (Cl).
Rb (rubidium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
Cs (Cesium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
U (Uranium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for 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.)
Sr (Strontium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.
Li (Lithium) 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.
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.
| Name | Affiliation | Contact |
|---|---|---|
| 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) |
| 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 |
| URL | https://www.bco-dmo.org/project/627844 |
| Created | November 30, 2015 |
| Modified | December 1, 2015 |
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.
| Name | Affiliation | Role |
|---|---|---|
| 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 |
