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| Titel |
Refinement of palaeotopography in modelling of glacial isostatic adjustment |
| VerfasserIn |
Volker Klemann, Jan M. Hagedoorn, Zdeněk Martinec |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049753
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| Zusammenfassung |
| When modelling the glacial-isotatic adjustment (GIA) by an initial value approach, the earth
is assumed to be hydrostatically prestressed in an initial state. Including the sea-level
equation in a solution requires, in addition, to define an initial topography, for which the
present-day topography is mostly chosen. At the first view, this choice is reasonable:
Topographical variability is by a few orders of magnitude larger than the residual
surface deformation at present time due to GIA, which is at most of the order of
100 m in northern Canada and some parts of Antarctica. But, when considering
the effect of the time-varying ocean load, the influence of palaeotopography may
become important. Assuming that coast lines follow the sea level, we determine the
initial topography in such a way that the predicted present-day topography after one
glacial cycle coincides with the actual topography. We discuss consequences for the
prediction of geodetic and geological observables as for the reconstruction of palaeo-sea
level. |
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