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Behrendt, Axel; Dierking, Wolfgang; Fahrbach, Eberhard; Witte, Hannelore (2013): Sea ice draft measured by upward looking sonars in the Weddell Sea (Antarctica). PANGAEA,, Supplement to: Behrendt, A et al. (2013): Sea ice draft in the Weddell Sea, measured by upward looking sonars. Earth System Science Data, 5(1), 209-226,

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The presented database contains time-referenced sea ice draft values from upward looking sonar (ULS) measurements in the Weddell Sea, Antarctica. The sea ice draft data can be used to infer the thickness of the ice. They were collected during the period 1990-2008. In total, the database includes measurements from 13 locations in the Weddell Sea and was generated from more than 3.7 million measurements of sea ice draft. The files contain uncorrected raw drafts, corrected drafts and the basic parameters measured by the ULS. The measurement principle, the data processing procedure and the quality control are described in detail. To account for the unknown speed of sound in the water column above the ULS, two correction methods were applied to the draft data. The first method is based on defining a reference level from the identification of open water leads. The second method uses a model of sound speed in the oceanic mixed layer and is applied to ice draft in austral winter. Both methods are discussed and their accuracy is estimated. Finally, selected results of the processing are presented.
Related to:
Behrendt, Axel (2013): The sea ice thickness in the Atlantic sector of the Southern Ocean. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 667, 246 pp,
Menze, Sebastian; Zitterbart, Daniel P; Van Opzeeland, Ilse; Boebel, Olaf (2017): The influence of sea ice, wind speed and marine mammals on Southern Ocean ambient sound. Royal Society Open Science, 4(1), 160370,
Further details:
Behrendt, Axel; Dierking, Wolfgang; Fahrbach, Eberhard; Witte, Hannelore (2013): Updates of figures 2 & 11 and table 5. hdl:10013/epic.39714.d007
Median Latitude: -65.617250 * Median Longitude: -12.682279 * South-bound Latitude: -70.911700 * West-bound Longitude: -52.101700 * North-bound Latitude: -59.029300 * East-bound Longitude: 0.177000
Date/Time Start: 1990-11-23T21:38:00 * Date/Time End: 2011-01-06T19:57:00
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