URLhttps://www.bco-dmo.org/dataset/664454
Download URLhttps://www.bco-dmo.org/dataset/664454/data/download
Media Typetext/tab-separated-values
CreatedNovember 10, 2016
ModifiedJuly 3, 2017
StateFinal no updates expected
Brief DescriptionChemistry from discrete samples of hydrothermal springs

Acquisition Description

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

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
* added lat, lon, and date of Alvin dives as listed in the Alvin Dive Log ​​

Instruments

syringe sample taken by Alvin [Discrete water sampler]
Details

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.

inductively coupled plasma mass spectrometry (ICP-MS) [Inductively Coupled Plasma Mass Spectrometer]
Details
An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.
Inductively Coupled Plasma Optical Emission Spectrophotometer (ICPOES) [Inductively Coupled Plasma Optical Emission Spectrometer]
Details

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

dive_id [dive_id]
Details
dive_id
Alvin submersible dive identifier
Unique dive id or number for ROV, AUV or HOV type system dive or deployment
dive_date [date]
Details
dive_date
Alvin submersible dive date in format yyyy-mm-dd

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)

sample_id [sample]
Details
sample_id

Sample identifier

unique sample identification or number; any combination of alpha numeric characters; precise definition is file dependent

DIC [DIC]
Details
DIC
Dissolved inorganic carbon using Pee Dee Belemnite (PDB) standard

Dissolved Inorganic Carbon

DIC_stdev [DIC]
Details
DIC_stdev
Standard deviation of dissolved inorganic carbon using the Pee Dee Belemnite (PDB) standard

Dissolved Inorganic Carbon

DIC_d13C [d13C_DIC]
Details
DIC_d13C
Stable carbon isotope ratio of dissolved inorganic carbon (13C:12C ratio in DIC) using the Pee Dee Belemnite (PDB) standard

Stable carbon isotope ratio of dissolved inorganic carbon (13C/12C ratio in DIC).

DIC_d13C_stdev [d13C_DIC]
Details
DIC_d13C_stdev
Standard deviation of stable carbon isotope ratio of dissolved inorganic carbon (13C:12C ratio in DIC) using the Pee Dee Belemnite (PDB) standard

Stable carbon isotope ratio of dissolved inorganic carbon (13C/12C ratio in DIC).

Mo [Mo]
Details
Mo
Molybdenum concentration

Mo (Molybdenum) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

V [V]
Details
V
Vanadium concentration

V (Vanadium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

pH [pH]
Details
pH
pH

pH: The measure of the acidity or basicity of an aqueous solution

alkalinity [TALK]
Details
alkalinity
Alkalinity

Total alkalinity per unit mass of the water body.

chlorinity [chlorinity]
Details
chlorinity
Chlorinity

A measure of chloride content (Cl).

Rb [Rb]
Details
Rb
Rubidium concentration

Rb (rubidium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Cs [Cs]
Details
Cs
Cesium concentration

Cs (Cesium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

U [U]
Details
U
Uranium concentration

U (Uranium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Details
PO4
Phosphate concentration
Concentration of a trace metal in seawater. Refer to dataset for element name and units.
N_plus_N [NO3_NO2]
Details
N_plus_N
Nitrate plus Nitrite concentration

Nitrate and Nitrite, µM (micromolar) or µg-at NO3-N and NO2-N/l

silicic_acid [SiOH_4]
Details
silicic_acid
Silicic acid concentration

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 [Sr]
Details
Sr
Strontium concentration

Sr (Strontium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Li [Li]
Details
Li
Lithium concentration

Li (Lithium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

S
Sulfur concentration

Concentration of a trace element in seawater. Does not include trace metals and metaloids.  Refer to dataset for element name and units.

Periodic Table

Na [Na]
Details
Na
Sodium concentration

Na (Sodium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Ca [Ca]
Details
Ca
Cadmium concentration

Ca (Calcium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Mg [Mg]
Details
Mg
Magnesium concentration

Mg (magnesium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

K [K]
Details
K
Potassium concentration

K (potassium) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

B [B]
Details
B
Boron concentration

B (Boron) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Mn [Mn]
Details
Mn
Manganese concentration

Mn (Manganese) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

Fe [Fe]
Details
Fe
Iron concentration
Fe (Iron) concentration. May be reported in parts per million, nanomoles/Liter, or other units. Refer to dataset metadata for units.

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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