http://lod.bco-dmo.org/id/dataset/904782
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2023-07-19
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Electrochemical data from sediment cores collected on the Louisiana Shelf of the Northern Gulf of Mexico during November 2020 on R/V Savannah cruise SAV-20-07
2023-07-20
publication
2023-07-20
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-07-02
publication
https://doi.org/10.26008/1912/bco-dmo.904782.1
Martial Taillefert
Georgia Institute of Technology
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Taillefert, M. (2024) Electrochemical data from sediment cores collected on the Louisiana Shelf of the Northern Gulf of Mexico during November 2020 on R/V Savannah cruise SAV-20-07. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-07-20 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.904782.1 [access date]
Northern Gulf of Mexico electrochemical data Fall 2020 Dataset Description: Methods and Sampling: <p>Intact sediments were collected and brought inside the ship's laboratory for profiling within 30 minutes after sampling. Each sediment core was profiled with a single non-invasive mercury/gold (Hg/Au) voltammetric microelectrode deployed on a computer-controlled micromanipulator along with an M-414 combination pH mini-electrode (Microelectrodes, Inc.). Dissolved oxygen (O2(aq)), manganese (Mn2+), iron (Fe2+), organic-Fe(III) complexes (Org-Fe(III)), aqueous clusters of FeS (FeS(aq)), thiosulfate (S2O32-), and total dissolved sulfide (SH2S = H2S + HS- + S(0) + Sx2-) were detected voltammetrically using either linear sweep voltammetry (LSV) for O2(aq) or cathodic square-wave voltammetry (CSWV) for the other species (Luther et al., 2008). Each voltammetric microelectrode was fabricated in-house and prepared by polishing the 100-micrometer (µm) gold tip to a mirror-like surface with diamond pastes of different sizes (15, 6, 1, and ¼ µm, Buehler Inc.), electroplating a liquid mercury layer on the Au surface at -0.2 volts (V) for 4 minutes, and calibrating for Mn2+ in degassed seawater according to previously published methods (Brendel and Luther, 1995). Voltammetric microelectrode quality was determined before calibration by measuring O2(aq) in a fully aerated 0.54 molar (M) NaCl solution by LSV. Dissolved oxygen is reduced to water at the electrode surface in two steps of two-electron transfer with the formation of hydrogen peroxide (H2O2) as intermediate species. As a result, good electrodes should produce two linear sweep waves of the same shape and current intensity. Electrodes that passed this quality test were calibrated for deployment in the sediment cores. Mn2+ calibrations were obtained by CSWV using at least five standard additions of a 0.1 M Mn2+ stock to a 0.54 M NaCl solution degassed with UHP N2 before calibration. Dissolved oxygen measured by LSV was calibrated ex situ in the overlying waters of sediment cores collected during the same cast by Winkler titration. Dissolved Fe2+ and SH2S were quantified by the pilot ion method using Mn2+ as the pilot ion (Luther et al., 2008; Tercier-Weber and Taillefert, 2009). Org-Fe(III) and FeS(aq) cannot be quantified by these methods and are reported in current intensities. Finally, the pH on the total scale was determined by measuring the temperature and electrode potential of both samples and a TRIS buffer in NaCl 0.54 M, then using the Nernst equation to calculate the pH of the samples (Skoog and Leary, 1996). Errors of all reported concentrations and current intensities represent the standard deviation of at least three replicate measurements at each depth in the sediment core.</p>
<p><strong>Instruments:</strong><br />
Sediment cores were collected with an MC-800 multi-corer (Ocean Instruments). Core barrels of 10-centimeter (cm) inner diameter and 75 cm long were used to collect sediments. A DLK-70 Electrochemical analyzer with electrode stand (STAND-1) and EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.) was used for all electrochemical analyses, including voltammetric scans and potential measurements at the pH minielectrode.</p>
<p><strong>Known Issues or Problems:</strong><br />
"nd" in the data set is provided when the chemical species were not determined, typically because of electrochemical noise issues on the ship, or because the electrochemical technique was not applied (e.g., the CSWV technique was not applied in the overlying waters). All data sets provided have been analytically validated using the procedures described above.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1948914 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1948914
completed
Martial Taillefert
Georgia Institute of Technology
404-894-6043
School of Earth and Atmospheric Sciences 311 Ferst Dr. NE
Atlanta
GA
30332
USA
mtaillef@eas.gatech.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Year
Month
Day
Date
Collection_Type
Station
Lon
Lat
Sediment_depth
pH
O2
sd_O2
Mn_II
sd_Mn_II
Fe_II
sd_Fe_II
SH2S
sd_SH2S
S2O3
sd_S2O3
Org_Fe_III
sd_Org_Fe_III
FeS_aq
sd_FeS_aq
EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.)
MC-800 multi-corer
pH microelectrodes
DLK-70 Electrochemical analyzer with electrode stand
theme
None, User defined
year
month of year
day of month
date
sample description
station
longitude
latitude
depth core
pH
dissolved Oxygen
Manganese
Iron
H2S
S2O3
featureType
BCO-DMO Standard Parameters
micromanipulator
Multi Corer
pH Sensor
Voltammetry Analyzers
instrument
BCO-DMO Standard Instruments
SAV-20-07
service
Deployment Activity
Louisiana Shelf, Northern Gulf of Mexico
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Importance of Riverine Discharge on the Benthic Flux of Alkalinity to Continental Margins
https://osprey.bco-dmo.org/project/894879
Importance of Riverine Discharge on the Benthic Flux of Alkalinity to Continental Margins
<p><em><strong>NSF Award Abstract</strong></em><br />
Ocean acidification is the process that lowers the pH of the ocean over time due to uptake of atmospheric carbon dioxide. This project investigates how chemical reactions in marine sediments exposed to high riverine sediment loads influence ocean acidification in coastal waters. Although we know that ocean acidification affects marine life and commercial fisheries in coastal waters, little is known about how acidification processes in the water column are influenced by reactions occurring in sediments on the sea floor. The role of large sediment deposits from rivers in these processes has also never been investigated. This study will be conducted in the Mississippi River and Gulf of Mexico. The Mississippi River transports a high sediment load to the continental shelf in the Gulf of Mexico and plays an important role in the economy of the southern coast of the United States. Results from this study will be useful to the oceanographic community for increasing understanding of ocean acidification processes in delta and shelf environments. It will also benefit decision makers interested in predicting the role of sediments on the nutrient -rich Louisiana shelf for discharge control purposes. This project also has an important educational component by training undergraduate, graduate, and postdoctoral students, providing experiences at sea for undergraduates, and conducting outreach activities with K-12 students.</p>
<p>The geochemical and microbiological processes responsible for the transformation of particles deposited on the seafloor will be characterized near the Mississippi River mouth and along the nearby continental slope. The release of acids (CO2) and bases (alkalinity) from the sediment will be quantified using autonomous instruments deployed on the seafloor to determine whether sediments contribute to the acidity of the surrounding water column or instead provide bases to buffer the water column from atmospheric CO2 inputs. As the Mississippi River discharge during the later Winter and Spring provides much more sediment to the coastal zone compared to the rest of the year, research cruises will be taken twice a year to determine how seasonal variations in riverine discharge affect the release of acids and bases into the water column. Mathematical models will then be used to predict the effect of seasonal variations on acids or bases release to the water column. This study will therefore provide a quantitative understanding of the role of large sediment depositions to the seafloor on sediment geochemical and microbiological processes and their feedback to the overlying waters. Simultaneously, a large data set will be generated and used to calibrate mathematical models and better characterize benthic-pelagic interactions. Such efforts are needed to predict how continental margins respond to constantly increasing stress from anthropogenic activities.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
NGoM Benthic Alk Flux
largerWorkCitation
project
eng; USA
oceans
Louisiana Shelf, Northern Gulf of Mexico
-90.3041
-89.5994
28.6035
28.9134
2020-11-03
2020-11-06
0
BCO-DMO catalogue of parameters from Electrochemical data from sediment cores collected on the Louisiana Shelf of the Northern Gulf of Mexico during November 2020 on R/V Savannah cruise SAV-20-07
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/904822.rdf
Name: Year
Units: unitless
Description: <p>4-digit year when samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/904823.rdf
Name: Month
Units: unitless
Description: <p>Month when samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/904824.rdf
Name: Day
Units: unitless
Description: <p>Day of month when samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/904825.rdf
Name: Date
Units: unitless
Description: <p>Date when samples were collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/904826.rdf
Name: Collection_Type
Units: unitless
Description: <p>Type of sample collection (Voltammetry)</p>
http://lod.bco-dmo.org/id/dataset-parameter/904827.rdf
Name: Station
Units: unitless
Description: <p>Station identifier</p>
http://lod.bco-dmo.org/id/dataset-parameter/904828.rdf
Name: Lon
Units: decimal degrees
Description: <p>Longitude where samples were collected; negative values = West</p>
http://lod.bco-dmo.org/id/dataset-parameter/904829.rdf
Name: Lat
Units: decimal degrees
Description: <p>Latitude where samples were collected; positive values = North</p>
http://lod.bco-dmo.org/id/dataset-parameter/904830.rdf
Name: Sediment_depth
Units: centimeters (cm)
Description: <p>Sediment depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/904831.rdf
Name: pH
Units: unitless (pH scale)
Description: <p>pH</p>
http://lod.bco-dmo.org/id/dataset-parameter/904832.rdf
Name: O2
Units: micrometers (uM)
Description: <p>Dissolved oxygen</p>
http://lod.bco-dmo.org/id/dataset-parameter/904833.rdf
Name: sd_O2
Units: micrometers (uM)
Description: <p>Standard deviation of O2</p>
http://lod.bco-dmo.org/id/dataset-parameter/904834.rdf
Name: Mn_II
Units: micrometers (uM)
Description: <p>Reduced manganese (Mn2+)</p>
http://lod.bco-dmo.org/id/dataset-parameter/904835.rdf
Name: sd_Mn_II
Units: micrometers (uM)
Description: <p>Standard deviation of Mn_II</p>
http://lod.bco-dmo.org/id/dataset-parameter/904836.rdf
Name: Fe_II
Units: micrometers (uM)
Description: <p>Electrochemical labile reduced iron (Fe2+)</p>
http://lod.bco-dmo.org/id/dataset-parameter/904837.rdf
Name: sd_Fe_II
Units: micrometers (uM)
Description: <p>Standard deviation of Fe_II</p>
http://lod.bco-dmo.org/id/dataset-parameter/904838.rdf
Name: SH2S
Units: micrometers (uM)
Description: <p>Total dissolved sulfides</p>
http://lod.bco-dmo.org/id/dataset-parameter/904839.rdf
Name: sd_SH2S
Units: micrometers (uM)
Description: <p>Standard deviation of SH2S</p>
http://lod.bco-dmo.org/id/dataset-parameter/904840.rdf
Name: S2O3
Units: micrometers (uM)
Description: <p>Thiosulfate (S2O32-)</p>
http://lod.bco-dmo.org/id/dataset-parameter/904841.rdf
Name: sd_S2O3
Units: micrometers (uM)
Description: <p>Standard deviation of S2O3</p>
http://lod.bco-dmo.org/id/dataset-parameter/904842.rdf
Name: Org_Fe_III
Units: nanoampere (nA)
Description: <p>Organic Fe(III) complexes</p>
http://lod.bco-dmo.org/id/dataset-parameter/904843.rdf
Name: sd_Org_Fe_III
Units: nanoampere (nA)
Description: <p>Standard deviation of Org_Fe_III</p>
http://lod.bco-dmo.org/id/dataset-parameter/904844.rdf
Name: FeS_aq
Units: nanoampere (nA)
Description: <p>Aqueous clusters of FeS</p>
http://lod.bco-dmo.org/id/dataset-parameter/904845.rdf
Name: sd_FeS_aq
Units: nanoampere (nA)
Description: <p>Standard deviation of FeS_aq</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
40504
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/809e123d-b6cd-4b98-b9ce-f9c45b90b83a/content
download
https://doi.org/10.26008/1912/bco-dmo.904782.1
download
onLine
dataset
<p>Intact sediments were collected and brought inside the ship's laboratory for profiling within 30 minutes after sampling. Each sediment core was profiled with a single non-invasive mercury/gold (Hg/Au) voltammetric microelectrode deployed on a computer-controlled micromanipulator along with an M-414 combination pH mini-electrode (Microelectrodes, Inc.). Dissolved oxygen (O2(aq)), manganese (Mn2+), iron (Fe2+), organic-Fe(III) complexes (Org-Fe(III)), aqueous clusters of FeS (FeS(aq)), thiosulfate (S2O32-), and total dissolved sulfide (SH2S = H2S + HS- + S(0) + Sx2-) were detected voltammetrically using either linear sweep voltammetry (LSV) for O2(aq) or cathodic square-wave voltammetry (CSWV) for the other species (Luther et al., 2008). Each voltammetric microelectrode was fabricated in-house and prepared by polishing the 100-micrometer (µm) gold tip to a mirror-like surface with diamond pastes of different sizes (15, 6, 1, and ¼ µm, Buehler Inc.), electroplating a liquid mercury layer on the Au surface at -0.2 volts (V) for 4 minutes, and calibrating for Mn2+ in degassed seawater according to previously published methods (Brendel and Luther, 1995). Voltammetric microelectrode quality was determined before calibration by measuring O2(aq) in a fully aerated 0.54 molar (M) NaCl solution by LSV. Dissolved oxygen is reduced to water at the electrode surface in two steps of two-electron transfer with the formation of hydrogen peroxide (H2O2) as intermediate species. As a result, good electrodes should produce two linear sweep waves of the same shape and current intensity. Electrodes that passed this quality test were calibrated for deployment in the sediment cores. Mn2+ calibrations were obtained by CSWV using at least five standard additions of a 0.1 M Mn2+ stock to a 0.54 M NaCl solution degassed with UHP N2 before calibration. Dissolved oxygen measured by LSV was calibrated ex situ in the overlying waters of sediment cores collected during the same cast by Winkler titration. Dissolved Fe2+ and SH2S were quantified by the pilot ion method using Mn2+ as the pilot ion (Luther et al., 2008; Tercier-Weber and Taillefert, 2009). Org-Fe(III) and FeS(aq) cannot be quantified by these methods and are reported in current intensities. Finally, the pH on the total scale was determined by measuring the temperature and electrode potential of both samples and a TRIS buffer in NaCl 0.54 M, then using the Nernst equation to calculate the pH of the samples (Skoog and Leary, 1996). Errors of all reported concentrations and current intensities represent the standard deviation of at least three replicate measurements at each depth in the sediment core.</p>
<p><strong>Instruments:</strong><br />
Sediment cores were collected with an MC-800 multi-corer (Ocean Instruments). Core barrels of 10-centimeter (cm) inner diameter and 75 cm long were used to collect sediments. A DLK-70 Electrochemical analyzer with electrode stand (STAND-1) and EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.) was used for all electrochemical analyses, including voltammetric scans and potential measurements at the pH minielectrode.</p>
<p><strong>Known Issues or Problems:</strong><br />
"nd" in the data set is provided when the chemical species were not determined, typically because of electrochemical noise issues on the ship, or because the electrochemical technique was not applied (e.g., the CSWV technique was not applied in the overlying waters). All data sets provided have been analytically validated using the procedures described above.</p>
Specified by the Principal Investigator(s)
<p><strong>Data Processing:</strong><br />
Voltammetric data were integrated using Voltint, an Matlab-based software developed in-house to identify and quantify the waves (O2, H2O2) by LSV or peaks (S2O32-, SH2S, Mn2+, Fe2+, Org-Fe(III), FeS(aq)) by CSWV (Bristow and Taillefert, 2008). As H2O2 is produced by reduction of O2(aq) at the electrode surface, it is not considered a species that is measurable in situ and is not reported in the data set. The potential of the pH mini-electrode is collected independently before the voltammetric scans and reported in the header of each scan. It is extracted from the headers by Voltint. The filename, potential, current, and surface area of each voltammetric peak quantified in the CSWV files as well as the filename, and potential of the pH mini-electrodes are automatically saved in two different files that can be processed further. The filename, potential, and limiting current of the O2(aq) and H2O2 waves quantified in the LSV scans are saved in a third file that can be processed further. Finally, a Matlab-based software was written to calculate the mean and standard deviation of the currents (and surface area for CSWV data) at each depth in the profiles before quantification of O2 by external calibrations and the other species by the pilot ion method. The Matlab-based software also calculates the average and standard deviation of the pH measurements at each depth.</p>
<p>In the data file, standard deviations of the mean of at least triplicate electrochemical measurements are provided with each parameter.</p>
<p><strong>BCO-DMO Processing:</strong><br />
- imported original file named "GOM_Fall2020_VoltammetryData_BCO-DMO.xlsx" into the BCO-DMO system;<br />
- added "Date" column from the separate "Year", "Month", and "Day" columns;<br />
- renamed fields to comply with BCO-DMO naming conventions;<br />
- named the final file "904782_v1_electrochemical_data.csv".</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.)
EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.)
PI Supplied Instrument Name: EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.) PI Supplied Instrument Description:A DLK-70 Electrochemical analyzer with electrode stand (STAND-1) and EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.) was used for all electrochemical analyses, including voltammetric scans and potential measurements at the pH minielectrode. Instrument Name: micromanipulator Instrument Short Name: Instrument Description: A micromanipulator is an apparatus used to physically interact with a sample under a microscope.
MC-800 multi-corer
MC-800 multi-corer
PI Supplied Instrument Name: MC-800 multi-corer PI Supplied Instrument Description:Sediment cores were collected with an MC-800 multi-corer (Ocean Instruments). Core barrels of 10 centimeters (cm) inner diameter and 75 cm long were used to collect sediments. Instrument Name: Multi Corer Instrument Short Name:Multi Corer Instrument Description: The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/
pH microelectrodes
pH microelectrodes
PI Supplied Instrument Name: pH microelectrodes Instrument Name: pH Sensor Instrument Short Name:pH Sensor Instrument Description: An instrument that measures the hydrogen ion activity in solutions.
The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).
DLK-70 Electrochemical analyzer with electrode stand
DLK-70 Electrochemical analyzer with electrode stand
PI Supplied Instrument Name: DLK-70 Electrochemical analyzer with electrode stand PI Supplied Instrument Description:A DLK-70 Electrochemical analyzer with electrode stand (STAND-1) and EX-MAN-1 micromanipulator (Analytical Instrument Systems, Inc.) was used for all electrochemical analyses, including voltammetric scans and potential measurements at the pH minielectrode. Instrument Name: Voltammetry Analyzers Instrument Short Name:Voltammetry Analyzers Instrument Description: Instruments that obtain information about an analyte by applying a potential and measuring the current produced in the analyte. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB35/
Cruise: SAV-20-07
SAV-20-07
R/V Savannah
Community Standard Description
R/V Savannah
vessel
SAV-20-07
Martial Taillefert
Georgia Institute of Technology
R/V Savannah
Community Standard Description
R/V Savannah
vessel