Portal de Periódicos da CAPES

Subglacial bedforms reveal complex basal regime in a zone of paleo–ice stream convergence, Amundsen Sea embayment, West Antarctica

2009; Geological Society of America; Volume: 37; Issue: 5 Linguagem: Inglês

10.1130/g25505a.1

1943-2682

Robert D Larter, Alastair G C Graham, Karsten Gohl, Gerhard Kühn, Claus‐Dieter Hillenbrand, James A Smith, T. Deen, Roy Livermore, Hans-Werner Schenke,

Winter Sports Injuries and Performance

Research Article| May 01, 2009 Subglacial bedforms reveal complex basal regime in a zone of paleo–ice stream convergence, Amundsen Sea embayment, West Antarctica Robert D. Larter; Robert D. Larter 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar Alastair G.C. Graham; Alastair G.C. Graham 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar Karsten Gohl; Karsten Gohl 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Search for other works by this author on: GSW Google Scholar Gerhard Kuhn; Gerhard Kuhn 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Search for other works by this author on: GSW Google Scholar Claus-Dieter Hillenbrand; Claus-Dieter Hillenbrand 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar James A. Smith; James A. Smith 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar Tara J. Deen; Tara J. Deen 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar Roy A. Livermore; Roy A. Livermore 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar Hans-Werner Schenke Hans-Werner Schenke 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Robert D. Larter 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Alastair G.C. Graham 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Karsten Gohl 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Gerhard Kuhn 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Claus-Dieter Hillenbrand 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK James A. Smith 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Tara J. Deen 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Roy A. Livermore 11British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Hans-Werner Schenke 22Alfred Wegener Institut für Polar und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany Publisher: Geological Society of America Received: 22 Sep 2008 Revision Received: 09 Dec 2008 Accepted: 14 Dec 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (5): 411–414. https://doi.org/10.1130/G25505A.1 Article history Received: 22 Sep 2008 Revision Received: 09 Dec 2008 Accepted: 14 Dec 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert D. Larter, Alastair G.C. Graham, Karsten Gohl, Gerhard Kuhn, Claus-Dieter Hillenbrand, James A. Smith, Tara J. Deen, Roy A. Livermore, Hans-Werner Schenke; Subglacial bedforms reveal complex basal regime in a zone of paleo–ice stream convergence, Amundsen Sea embayment, West Antarctica. Geology 2009;; 37 (5): 411–414. doi: https://doi.org/10.1130/G25505A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.