Friedrich, Jana (2011): Polonium-210 and Lead-210 activities measured on 17 water bottle profiles and 50 surface water samples during POLARSTERN cruise ARK-XXII/2 [dataset]. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.763937
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Abstract:
Polonium-210 and Lead-210 have been measured in the water column and on suspended particulate matter during the POLARSTERN cruise ARK-XXII/2. The data have been submitted to Pangaea following a Polonium-Lead intercalibration exercise organized by GEOTRACES, where the AWI lab results range within the data standard deviation from 10 participating labs.
Polonium-210 and Lead-210 in the ocean can be used to identify the sources and sinks of suspended matter. In seawater, Polonium-210 (210Po) and Lead-210 (210Pb) are produced by stepwise radioactive decay of Uranium-238. 210Po (138 days half life) and 210Pb (22.3 years half life) have high affinities for suspended particles. Those radionuclides are present in dissolved form and adsorbed onto particles. Following adsorption onto particle surfaces, 210Po especially is transported into the interior of cells where it bonds to proteins. In this way, 210Po also accumulates in the food chain. 210Po is therefore considered to be a good tracer for POC, and traces particle export over a timescale of month. 210Pb (22.3 years half life) adsorbs preferably onto structural components of cells, biogenic silica and lithogenic particles, and is therefore a better tracer more rapidly sinking matter.
Our goal during ARK XXII/2 was to trace pathways of particulate and dissolved matter leaving the Siberian Shelf. The pathways of particulate and dissolved matter will be followed by the combined use of 210Po and 234Th as a tracer pair (and perhaps 210Pb) for particle flux (Cai, P.; Rutgers van der Loeff, MM (2008) doi:10.1594/PANGAEA.708354). This information gathered from the water column will be complemented with the results of the 210Po-210Pb study in sea ice (Camara-Mor, P, Instituto de Ciencias del Mar-SCIC, Barcelona, Spain) to provide a more thorough picture of particle transport from the shelf to the open sea and from surface to depth.
Related to:
Roca-Martí, Montserrat; Puigcorbé, Viena; Friedrich, Jana; Rutgers van der Loeff, Michiel M; Rabe, Benjamin; Korhonen, Meri; Cámara-Mor, Patricia; García-Orellana, Jordi; Masqué, Pere (2018): Distribution of 210Pb and 210Po in the Arctic water column during the 2007 sea-ice minimum: Particle export in the ice-covered basins. Deep Sea Research Part I: Oceanographic Research Papers, https://doi.org/10.1016/j.dsr.2018.09.011
Schauer, Ursula (2008): The Expedition ARKTIS-XXII/2 of the Research Vessel Polarstern in 2007. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 579, 264 pp, https://doi.org/10.2312/BzPM_0579_2008
Project(s):
Coverage:
Median Latitude: 82.719598 * Median Longitude: 102.443533 * South-bound Latitude: 75.200500 * West-bound Longitude: 33.950100 * North-bound Latitude: 88.411100 * East-bound Longitude: -135.034800
Date/Time Start: 2007-07-31T07:47:00 * Date/Time End: 2007-09-23T22:42:00
Minimum DEPTH, water: 10 m * Maximum DEPTH, water: 4365 m
Event(s):
PS70/236-1 * Latitude: 77.500800 * Longitude: 33.986600 * Date/Time: 2007-07-31T07:47:00 * Elevation: -190.0 m * Location: Arctic Ocean * Campaign: ARK-XXII/2 (PS70 SPACE DAMOCLES) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS70/237-1 * Latitude: 78.997200 * Longitude: 33.989800 * Date/Time: 2007-07-31T18:35:00 * Elevation: -275.0 m * Location: Arctic Ocean * Campaign: ARK-XXII/2 (PS70 SPACE DAMOCLES) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS70/239-1 * Latitude: 80.994600 * Longitude: 33.996600 * Date/Time: 2007-08-01T08:24:00 * Elevation: -222.0 m * Location: Arctic Ocean * Campaign: ARK-XXII/2 (PS70 SPACE DAMOCLES) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2820 data points
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