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

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 b...

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Bibliographic Details
Main Authors: 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
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
Subjects:
DATE/TIME
LATITUDE
LONGITUDE
Course
Speed
Uniform resource locator/link to raw data file
Underway cruise track measurements
ParaSound Atlas Hydrographic
ANT-XXIII/4
Polarstern
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo
Amundsen Sea
West Antarctica
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.708219
https://doi.pangaea.de/10.1594/PANGAEA.708219
Description
Summary: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. : see also http://www.marine-geo.org/tools/search/DataSets.php?data_set_uids=9112,9126

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