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| Titel |
Empirical estimation of present-day Antarctic glacial isostatic adjustment and ice mass change |
| VerfasserIn |
Olga Didova, Brian C. Gunter, Riccardo Riva, Stefan Ligtenberg, Jan Lenaerts, Matt A. King, Michiel R. van den Broeke, Tim Urban |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091808
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| Publikation (Nr.) |
 EGU/EGU2014-6121.pdf |
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| Zusammenfassung |
| This study explores an empirical approach that simultaneously estimates Antarctic mass
balance and glacial isostatic adjustment (GIA) through the combination of satellite gravity,
altimetry and climate data.
Antarctic ice mass loss estimates are contaminated by large uncertainties associated with
GIA. The impact of this ice loss on the global climate cycle is substantial, as the resulting
change in sea level and ocean currents could have global environmental and societal
consequences.
In this study, estimates of present-day GIA and ice mass changes are generated using
reprocessed and extended satellite gravity and altimetry data sets. The key elements of the
combination approach are an improved estimate of surface processes by incorporating a
regional atmospheric climate model RACMO2 and accompanying firn densification model, as
well as a calibration of the results to a low-precipitation zone in East Antarctica. Through
formal error propagation techniques, the uncertainties for both the GIA and ice mass change
estimates are obtained. The empirically derived GIA models are compared to a set of
Antarctic GNSS site displacements, as well as to traditionally derived Antarctic GIA
models.
The main result is an empirically derived regional Antarctic GIA model with corresponding
uncertainties, which suggests the presence of strong uplift in the Amundsen Sea and
Philippi/Denman sectors, as well as subsidence in large parts of East Antarctica. |
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