Swath sonar bathymetry during POLARSTERN cruise ARK-VII/3a (PS17) with links to multibeam raw data files

In multibeam echosounder and subbottom profiler data acquired during R/V Polarstern cruise ARK-VII/3a from the Hovgaard Ridge (Fram Strait), we found evidence for very deep (>1200 m) iceberg scouring. Five elongated seafloor features have been detected that are interpreted to be iceberg scours. T...

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Bibliographic Details
Main Authors: Schenke, Hans Werner, Niederjasper, Fred, Monk, Jürgen, Dreyer, Johannes, Laing, Ralf, Voelker, Karsten
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
ARK-VII/3a
AWI_Paleo
CT
DATE/TIME
LATITUDE
LONGITUDE
Paleoenvironmental Reconstructions from Marine Sediments @ AWI
Polarstern
PS17
PS17/3a-track
Swath-mapping system Atlas Hydrosweep DS-1
Underway cruise track measurements
Uniform resource locator/link to raw data file
Arctic
Arctic Ocean
St. Anna Trough
Hovgaard
Fram Strait
Iceberg*
Nordic Seas
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.767608
https://doi.org/10.1594/PANGAEA.767608
Description
Summary:In multibeam echosounder and subbottom profiler data acquired during R/V Polarstern cruise ARK-VII/3a from the Hovgaard Ridge (Fram Strait), we found evidence for very deep (>1200 m) iceberg scouring. Five elongated seafloor features have been detected that are interpreted to be iceberg scours. The scours are oriented in north-south/south-north direction and are about 15 m deep, 300 m wide, and 4 km long crossing the entire width of the ridge. They are attributed to multiple giant paleo-icebergs that most probably left the Arctic Ocean southward through Fram Strait. The huge keel depths are indicative of ice sheets extending into the Arctic Ocean being at least 1200 m thick at the calving front during glacial maxima. The deep St. Anna Trough or grounded ice observed at the East Siberian Continental Margin are likely source regions of these icebergs that delivered freshwater to the Nordic Seas.

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