URLhttps://www.bco-dmo.org/dataset/671260
Download URLhttps://www.bco-dmo.org/dataset/671260/data/download
Media Typetext/tab-separated-values
CreatedDecember 27, 2016
ModifiedJuly 3, 2017
StateFinal no updates expected
Brief DescriptionPore 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

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).
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

cmbsf [depth_bsf]
Details
cmbsf

Depth below sea floor of sample

depth below seafloor.  Includes mbsf (meters below seafloor) and cmbsf (centimeters below seafloor).

core_id [core_id]
Details
core_id

Gravity core identifier

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

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)

phosphate [PO4]
Details
phosphate
Phosphate concentration

Orthophosphate (phosphate, reactive phosphorus), Various units. 

N_plus_N [NO3_NO2]
Details
N_plus_N
Nitrate plus Nitrite (NO3+NO2) 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.)

NH4 [Ammonium]
Details
NH4
Ammonium concentration

Ammonium and ammonia concentration parameters in any body of fresh or salt water.

d13C_DIC [d13C_DIC]
Details
d13C_DIC
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).

d13C_DIC_stdev [d13C_DIC]
Details
d13C_DIC_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).

d13C [d13C]
Details
d13C
Stable carbon isotope ratio (13C:12C)

Delta 13C (d13C) is the ratio of stable isotopes 13C:12C, reported in parts per thousand (per mil, 0/00).

Ba [Ba]
Details
Ba
Barium concentration

Ba (Barium). May be reported in parts per million, nanomoles per 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.
Si [Si]
Details
Si
Silicon concentration

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

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.

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
Calcium 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.

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.

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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