Sediment echosounding data files from the Amundsen Sea, supplement to: Larter, Robert D; Graham, Alastair G C; Gohl, Karsten; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Smith, James A; Deen, Tara J; Livermore, Roy A; Schenke, Hans Werner (2009): Subglacial bedforms reveal complex basal regime in a zone of paleo-ice stream convergence, Amundsen Sea Embayment, West Antarctica. Geology, 37(5), 411-414

DOI

The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at their bed. Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods extensive areas of the former bed can be imaged using modern swath sonar tools. We present new multibeam swath bathymetry data analyzed alongside sparse pre-existing data from the Amundsen Sea Embayment. The compilation is the most extensive, continuous area of multibeam data coverage yet obtained on the inner continental shelf of Antarctica. The data reveal streamlined subglacial bedforms that define a zone of paleo-ice stream convergence but, in contrast to previous models, do not show a simple down-flow progression of bedform types along paleo-ice stream troughs. We interpret high spatial variability of bedforms as indicating a complex mechanical and hydrodynamic regime at the former ice stream beds, consistent with observations from some modern ice streams. We conclude that care must be taken when using bedforms to infer paleo-ice stream velocities.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.708219
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.708219
Provenance
Creator Hillenbrand, Claus-Dieter;Gohl, Karsten;Kuhn, Gerhard;Deen, Tara J;Larter, Robert D;Smith, James A;Schenke, Hans Werner;Graham, Alastair G C;Livermore, Roy A
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2009
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Discipline Earth System Research
Spatial Coverage (75S-70S,119W-103W)
Temporal Point 2006-02-23T11:59:59Z