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| Titel |
The imbalance of glaciers after disintegration of Larsen-B ice shelf, Antarctic Peninsula |
| VerfasserIn |
H. Rott, F. Müller, T. Nagler, D. Floricioiu |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2011-03-01), S.125-134 |
| Datensatznummer |
250002275
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| Publikation (Nr.) |
 copernicus.org/tc-5-125-2011.pdf |
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| Zusammenfassung |
| The outlet glaciers to the embayment of the Larsen-B Ice Shelf started to
accelerate soon after the ice shelf disintegrated in March 2002. We analyse
high resolution radar images of the TerraSAR-X satellite, launched in June
2007, to map the motion of outlet glaciers in detail. The frontal velocities
are used to estimate the calving fluxes for 2008/2009. As reference for
pre-collapse conditions, when the glaciers were in balanced state, the ice
fluxes through the same gates are computed using ice motion maps derived
from interferometric data of the ERS-1/ERS-2 satellites in 1995 and 1999.
Profiles of satellite laser altimetry from ICESat, crossing the terminus of
several glaciers, indicate considerable glacier thinning between 2003 and
2007/2008. This is taken into account for defining the calving cross
sections. The difference between the pre- and post-collapse fluxes provides
an estimate on the mass imbalance. For the Larsen-B embayment the 2008 mass
deficit is estimated at 4.34 ± 1.64 Gt a−1, significantly lower
than previously published values. The ice flow acceleration follows a
similar pattern on the various glaciers, gradually decreasing in magnitude
with distance upstream from the calving front. This suggests stress
perturbation at the glacier front being the main factor for acceleration. So
far there are no signs of slow-down indicating that dynamic thinning and
frontal retreat will go on. |
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