Skip to main content

IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (0): add | show Print this page

Subglacial bedforms reveal complex basal regime in a zone of paleo–ice stream convergence, Amundsen Sea embayment, West Antarctica
Larter, R.D.; Graham, A.G.C.; Gohl, K.; Kuhn, G.; Hillenbrand, C.-D.; Smith, J.A.; Deen, T.J.; Livermore, R.A.; Schenke, H.W. (2009). Subglacial bedforms reveal complex basal regime in a zone of paleo–ice stream convergence, Amundsen Sea embayment, West Antarctica. Geology (Boulder Colo.) 37(5): 411-414. http://dx.doi.org/10.1130/G25505A.1
In: Geology. Geological Society of America: Boulder. ISSN 0091-7613; e-ISSN 1943-2682, more
Peer reviewed article  

Available in  Authors | Dataset 

Keyword
    Marine/Coastal

Authors  Top | Dataset 
  • Larter, R.D.
  • Graham, A.G.C.
  • Gohl, K.
  • Kuhn, G.
  • Hillenbrand, C.-D.
  • Smith, J.A.
  • Deen, T.J.
  • Livermore, R.A.
  • Schenke, H.W.

Abstract
    The flow of ice streams, which account for most discharge from large ice sheets, is controlled by processes operating at the ice stream 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 preexisting data from the Amundsen Sea embayment. The compilation is the most extensive, continuous area of multi-beam 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 downflow 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.

Dataset
  • Moreau C, Linse K, Griffiths HJ, Barnes DKA, Kaiser S, Glover A, Sands C, Strugnell J, Enderlein P, Geissler P (2013). Amundsen Sea Mollusca from the BIOPEARL II expedition. 692 records, published online, http://ipt.biodiversity.aq/archive.do?r=amundsenseamolluscs_biopearl_ii, more

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors | Dataset