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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. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, PANGAEA,

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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:
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,
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
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 * 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 * 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 * Device: CTD/Rosette, ultra clean (CTD-UC)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Polonium 210, particulate210Po partdpm/100 lFriedrich, Jana
8Polonium 210, particulate, standard deviation210Po part std dev±Friedrich, Jana
9Polonium 210, dissolved210Po dissdpm/100 lFriedrich, Jana
10Polonium 210, dissolved, standard deviation210Po diss std dev±Friedrich, Jana
11Polonium 210210Podpm/100 lFriedrich, Jana
12Polonium 210, standard deviation210Po std dev±Friedrich, Jana
13Lead 210, particulate210Pb partdpm/100 lFriedrich, Jana
14Lead 210, particulate, standard deviation210Pb part std dev±Friedrich, Jana
15Lead 210, dissolved210Pb dissdpm/100 lFriedrich, Jana
16Lead 210, dissolved, standard deviation210Pb diss std dev±Friedrich, Jana
17Lead 210210Pbdpm/100 lFriedrich, Jana
18Lead 210, standard deviation210Pb std dev±Friedrich, Jana
19Polonium 210/Lead 210 activity ratio, dissolved(210Po/210Pb) dissFriedrich, Jana
20Polonium 210/Lead 210 activity ratio, dissolved, standard deviation(210Po/210Pb) diss std dev±Friedrich, Jana
21Polonium 210/Lead 210 activity ratio(210Po/210Pb)Friedrich, Jana
22Polonium 210/Lead 210, standard deviation210Po/210Pb std dev±Friedrich, Jana
23Polonium 210/Lead 210 activity ratio, particulate(210Po/210Pb) partFriedrich, Jana
24Polonium 210/Lead 210 activity ratio, particulate, standard deviation(210Po/210Pb) part std dev±Friedrich, Jana
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