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| Titel |
An ice flow modeling perspective on bedrock adjustment patterns of the Greenland ice sheet |
| VerfasserIn |
M. Olaizola, R. S. W. Wal, M. M. Helsen, B. Boer |
| 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 ; 6, no. 6 ; Nr. 6, no. 6 (2012-11-07), S.1263-1274 |
| Datensatznummer |
250003865
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| Publikation (Nr.) |
 copernicus.org/tc-6-1263-2012.pdf |
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| Zusammenfassung |
| Since the launch in 2002 of the Gravity Recovery and Climate Experiment
(GRACE) satellites, several estimates of the mass balance of the Greenland
ice sheet (GrIS) have been produced. To obtain ice mass changes, the GRACE
data need to be corrected for the effect of deformation changes of the
Earth's crust. Recently, a new method has been proposed where ice mass changes
and bedrock changes are simultaneously solved. Results show bedrock
subsidence over almost the entirety of Greenland in combination with ice mass
loss which is only half of the currently standing estimates. This subsidence
can be an elastic response, but it may however also be a delayed response to
past changes. In this study we test whether these subsidence patterns are
consistent with ice dynamical modeling results. We use a 3-D ice sheet–bedrock model with a surface mass balance forcing based on a mass balance
gradient approach to study the pattern and magnitude of bedrock changes in
Greenland. Different mass balance forcings are used. Simulations since the
Last Glacial Maximum yield a bedrock delay with respect to the mass balance
forcing of nearly 3000 yr and an average uplift at present of 0.3 mm
yr−1. The spatial pattern of bedrock changes shows a small central
subsidence as well as more intense uplift in the south. These results are not
compatible with the gravity based reconstructions showing a subsidence with a
maximum in central Greenland, thereby questioning whether the claim of
halving of the ice mass change is justified. |
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