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| Titel |
Glacial Isostatic Adjustment over the Amundsen Sea Sector inferred by means of geodetic observations |
| VerfasserIn |
Andreas Groh, Heiko Ewert, Mirko Scheinert, Mathias Fritsche, Axel Rülke, Andreas Richter, Ralf Rosenau, Reinhard Dietrich |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074577
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| Zusammenfassung |
| Using GRACE-derived monthly gravity field solutions and campaign-wise laser altimetry data provided by ICESat, mean present-day changes of mass and volume over the Amundsen Sea Sector, West Antarctica, are derived. Since a priori a GIA model is not used to correct the observations the combination of both observational results allows to infer the mean GIA-induced mass change. This GIA-induced mass change is found to be significantly larger than predicted by current GIA models. In order to validate this finding, the inferred mean GIA-induced elevation change is compared to the uplift rates observed at three GPS sites. For this purpose, the observed uplift rates are corrected for elastic crustal deformations due to present-day ice-mass changes, which are derived from ICESat-observed high resolution surface height changes. Finally, the impact of the newly inferred GIA correction for the Amundsen Sea Sector on GRACE-derived present-day ice-mass change estimates and their corresponding sea-level contribution are discussed. |
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