Publication Date:
2024-02-27
Description:
Vertical profiles of dissolved oxygen (O2) concentrations in the surface sediment of the North Atlantic Basin were acquired during MSM96 through ex-situ voltametric measurements during this research cruise. For every multicorer station, one liner was selected and transported to the on-board cool room immediately for analysis at 5°C. At some stations, a second core was analyzed for validation and to achieve better measurement resolution. Measurements were carried out through cyclic voltammetry (start: -100 mV, vertex: -1900 mV, start: -100 mV, scan rate: 500 mv/s) with Hg/Au microelectrodes (100 µm diameter) in a 3-electrode configuration with an Ag/AgCl pseudoreference electrode and a Pt counter electrode using a modified custom version of the DStat open source potentiostat (Dryden & Wheeler, 2015; doi:10.1371/journal.pone.0140349). Working electrodes were polished and Hg-plated prior to the research cruise according to the method by Brendel & Luther III (1995; doi:10.1021/es00003a024) and repolished (using diamond polishing plates of 5, 1 and 0.25 µm grit) and plated (180s at -100mV in 0.1M Hg(NO3)2 solution) on board when degradation of the signal was detected (twice over the duration of the cruise). Measurements were calibrated to 100% O2 saturation in bottom water at equilibrium with the atmosphere after recording air pressure and temperature to calculate dissolved O2 concentration as well as 0% O2 saturation in bottom water that was purged of oxygen by bubbling with nitrogen (N2) gas. The sensor was moved vertically on a linear axis with a stepper motor through an automated control system hosted on a Raspberry Pi control unit.
Keywords:
Comment; Core; Date/Time of event; DEPTH, sediment/rock; Elevation of event; Event label; GPF 20‐3_088; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; KIEL0233GE0V201; KIEL0233GE1V201; KIEL0233GE4V201; KIEL0233GE5V201; KIEL0233GE6V201; KIEL0233GE7V201; KIEL0233GE9V201; KIEL0233GEAV201; KIEL0233GEBU201; KIEL0233GEBV201; KIEL0233GECU201; KIEL0233GEDV201; KIEL0233GEMU201; KIEL0233GEPU201; KIEL0233GEQU201; KIEL0233GERU201; KIEL0233GESU201; KIEL0233GETU201; KIEL0233GEUU201; KIEL0233GEVU201; KIEL0233GEXU201; KIEL0233GEYU201; KIEL0233GEZU201; Latitude of event; Location; Location type; Longitude of event; MareHub; MareHub der marinen Zentren AWI, GEOMAR und HZG als Teil des DataHub des Forschungsbereichs Erde und Umwelt der HGF; Maria S. Merian; MSM96; MSM96_11-1; MSM96_20-1; MSM96_21-1; MSM96_22-1; MSM96_24-1; MSM96_25-1; MSM96_27-1; MSM96_28-1; MSM96_33-1; MSM96_36-1; MSM96_37-1; MSM96_39-1; MSM96_40-1; MSM96_47-1; MSM96_48-1; MSM96_50-1; MSM96_51-1; MSM96_55-1; MSM96_57-1; MSM96_61-1; MSM96_66-1; MSM96_7-3; MSM96_8-1; MUC; MultiCorer; Multicorer with television; North Atlantic; Optional event label; Oxygen; Oxygen, microelectrode, ex-situ; Oxygen saturation; Sample ID; sediment; sedimentary geochemistry; South Atlantic Ocean; Station label; TVMUC
Type:
Dataset
Format:
text/tab-separated-values, 44830 data points
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