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| Titel |
Increased rate of acceleration on Pine Island Glacier strongly coupled to changes in gravitational driving stress |
| VerfasserIn |
J. B. T. Scott, G. H. Gudmundsson, A. M. Smith, R. G. Bingham, H. D. Pritchard, D. G. Vaughan |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2009-05-13), S.125-131 |
| Datensatznummer |
250000790
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| Publikation (Nr.) |
 copernicus.org/tc-3-125-2009.pdf |
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| Zusammenfassung |
| Pine Island Glacier, Antarctica, has been undergoing several related changes
for at least two decades; these include acceleration, thinning and grounding
line retreat. During the first major ground-based study between 2006 and
2008, GPS receivers were used to monitor ice flow from 55 km to 171 km
inland, along the central flowline. At four sites both acceleration and
thinning rates over the last two years exceeded rates observed at any other
time over the last two decades. At the downstream site acceleration was 6.4%
over 2007 and thinning was 3.5±0.5 ma−1. Acceleration and
thinning have spread rapidly inland with the acceleration 171 km inland at
4.1% over 2007, greater than any measured annual flow increase along the
whole glacier prior to 2006. Increases in surface slope, and hence
gravitational driving stress, correlate well with the acceleration and no
sustained change in longitudinal stress gradient is needed to explain the
force balance. There is no indication that the glacier is approaching a new
steady state. |
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