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| Titel |
Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica |
| VerfasserIn |
F. O. Nitsche, K. Gohl, R. D. Larter, C.-D. Hillenbrand, G. Kühn, J. A. Smith, S. Jacobs, J. B. Anderson, M. Jakobsson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 1 ; Nr. 7, no. 1 (2013-02-08), S.249-262 |
| Datensatznummer |
250017417
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| Publikation (Nr.) |
 copernicus.org/tc-7-249-2013.pdf |
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| Zusammenfassung |
| Increasing evidence for an elaborate subglacial drainage network underneath
modern Antarctic ice sheets suggests that basal meltwater has an important
influence on ice stream flow. Swath bathymetry surveys from previously
glaciated continental margins display morphological features indicative of
subglacial meltwater flow in inner shelf areas of some paleo ice stream
troughs. Over the last few years several expeditions to the eastern Amundsen
Sea embayment (West Antarctica) have investigated the paleo ice streams that
extended from the Pine Island and Thwaites glaciers. A compilation of
high-resolution swath bathymetry data from inner Pine Island Bay reveals
details of a rough seabed topography including several deep channels that
connect a series of basins. This complex basin and channel network is
indicative of meltwater flow beneath the paleo-Pine Island and Thwaites ice
streams, along with substantial subglacial water inflow from the east. This
meltwater could have enhanced ice flow over the rough bedrock topography.
Meltwater features diminish with the onset of linear features north of the
basins. Similar features have previously been observed in several other
areas, including the Dotson-Getz Trough (western Amundsen Sea embayment) and
Marguerite Bay (SW Antarctic Peninsula), suggesting that these features may
be widespread around the Antarctic margin and that subglacial meltwater
drainage played a major role in past ice-sheet dynamics. |
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