Ulfsbo, Adam; Droste, Elise Sayana; Torres-Valdés, Sinhué (2023): Dissolved oxygen of seawater samples during RV POLARSTERN expedition PS122 – MOSAiC [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.955092
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Abstract:
Discrete seawater samples for total dissolved oxygen were collected from the Polarstern (vessel:polarstern:ctd_sbe9plus_321) and Ocean City (vessel:polarstern:ctd_sbe9plus_935) CTD/Rosette systems during the Multidisciplinary drifting observatory for the study of Arctic Climate (MOSAiC) expedition, 20 September 2019 – 14 October 2020. Dissolved oxygen was analyzed on board RV Polarstern during legs 3, 4, and 5 between 6 March 2020 and 17 September 2020. Seawater was drawn from Niskin bottles into Winkler flasks using silicon tubing, filling from the bottom and allowing seawater to overflow by at least two flask volumes (approximately 120 mL). The samples were directly pickled by the addition of 1 mL each of concentrated manganese chloride (3 M) and alkaline (NaOH 8 M) sodium iodide (4 M) solutions to form manganese oxyhydrodoxide precipitate. Samples were stored in the dark and underwater at room temperature until analysis. Dissolved oxygen was determined using an automatic Winkler titration setup with potentiometric detection (Titrino plus 848, Metrohm, Switzerland). Reagents were prepared according to Langdon (2010). Blanks were determined before each run by addition of reagents to MilliQ water. The titrations were performed directly in the flasks used for sampling after the manganese oxyhydroxide precipitate was dissolved by addition of sulphuric acid (5 M). Sodium thiosulphate (~0.2 N) solutions were prepared onboard for the titration and the concentration was determined before each run using an iodate standard (0.01 N, OSIL, United Kingdom). The analytical precision based on duplicate samples analysis was 0.4 ± 2.6 µmol/kg (n = 60).
References:
Langdon, Chris (2010): Determination of Dissolved Oxygen in Seaweater By Winkler Titration using Amperometric Technique. In: The GO-SHIP Repeat Hydrography Manual: A Collection of Expert Reports and Guidelines. Version 1. GO-SHIP, https://doi.org/10.25607/OBP-1350
Nixdorf, Uwe; Dethloff, Klaus; Rex, Markus; Shupe, Matthew D; Sommerfeld, Anja; Perovich, Donald K; Nicolaus, Marcel; Heuzé, Céline; Rabe, Benjamin; Loose, Brice; Damm, Ellen; Gradinger, Rolf; Fong, Allison A; Maslowski, Wieslaw; Rinke, Annette; Kwok, Ronald; Spreen, Gunnar; Wendisch, Manfred; Herber, Andreas; Hirsekorn, Marius; Mohaupt, Verena; Frickenhaus, Stephan; Immerz, Antonia; Weiss-Tuider, Katharina; König, Bjela; Mengedoht, Dirk; Regnery, Julia; Gerchow, Peter; Ransby, Daniela; Krumpen, Thomas; Morgenstern, Anne; Haas, Christian; Kanzow, Torsten; Rack, Frank R; Saitzev, Vladimir; Sokolov, Vladimir; Makarov, Alexander; Schwarze, Stefan; Wunderlich, Thomas; Wurr, Karsten; Boetius, Antje (2021): MOSAiC Extended Acknowledgement. Zenodo, https://doi.org/10.5281/zenodo.5179738
Project(s):
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AFMOSAiC-1_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS122_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
Department for Business, Energy and Industrial Strategy, UK Government (BEIS), grant/award no. BEIS_MOSAiC
Natural Environment Research Council (NERC), grant/award no. NE/L002582/1: NERC EnvEast Doctoral Training Partnership - NE/L002582/1
Swedish Research Council (VR), grant/award no. 2018-01398_Formas: Drivers of anthropogenic changes in carbon storage and ocean acidification in the new Arctic Ocean (DRACO2)
Coverage:
Median Latitude: 83.494422 * Median Longitude: 26.307976 * South-bound Latitude: 78.587200 * West-bound Longitude: -2.659000 * North-bound Latitude: 89.992700 * East-bound Longitude: 131.630800
Date/Time Start: 2020-03-06T11:07:00 * Date/Time End: 2020-09-17T06:55:00
Minimum DEPTH, water: 1 m * Maximum DEPTH, water: 4211 m
Event(s):
PS122/3_30-53 * Latitude: 88.100391 * Longitude: 29.428494 * Date/Time: 2020-03-06T12:46:00 * Elevation: -4228.2 m * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: Mosaic Scholle; SL= 4317m
PS122/3_31-59 * Latitude: 87.143902 * Longitude: 17.341387 * Date/Time: 2020-03-14T08:28:00 * Elevation: -4145.4 m * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: J. Schaffer, C. Hoppe; 4215 m, SE 32.1
PS122/3_36-59 * Latitude: 84.314389 * Longitude: 13.125592 * Date/Time: 2020-04-16T08:26:00 * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: 20200416 oc ctd: oc
Domain attribute(s):
Comment:
This dataset was produced as part of the international Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC) with the tag MOSAiC20192020. We thank all persons involved in the expedition of the Research Vessel Polarstern during MOSAiC in 2019-2020 (AWI_PS122_00) as listed in Nixdorf et al. (2021). This work was supported by the Swedish Polar Research Secretariat as part of the MOSAiC 2019-2020 expedition.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Ulfsbo, Adam | |||
| 2 | DATE/TIME | Date/Time | Ulfsbo, Adam | Geocode | ||
| 3 | LATITUDE | Latitude | Ulfsbo, Adam | Geocode | ||
| 4 | LONGITUDE | Longitude | Ulfsbo, Adam | Geocode | ||
| 5 | Bottle number | Bottle | Ulfsbo, Adam | Niskin ID | ||
| 6 | DEPTH, water | Depth water | m | Ulfsbo, Adam | Geocode | |
| 7 | Pressure, water | Press | dbar | Ulfsbo, Adam | ||
| 8 | Salinity | Sal | Ulfsbo, Adam | PSS78 | ||
| 9 | Quality flag, salinity | QF sal | Ulfsbo, Adam | World Oceans Circulation Experiment (WOCE) quality flags according to Jiang et al. (2022) | ||
| 10 | Temperature, water | Temp | °C | Ulfsbo, Adam | ITS90 | |
| 11 | Quality flag, water temperature | QF water temp | Ulfsbo, Adam | World Oceans Circulation Experiment (WOCE) quality flags according to Jiang et al. (2022) | ||
| 12 | Oxygen | O2 | µmol/kg | Ulfsbo, Adam | Potentiometric titrator, Metrohm, 848 Titrino plus | |
| 13 | Quality flag, oxygen | QF O2 | Ulfsbo, Adam | World Oceans Circulation Experiment (WOCE) quality flags according to Jiang et al. (2022) | ||
| 14 | Uniform resource locator/link to sensor metadata | URL sensor | Ulfsbo, Adam |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
1404 data points