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Refinement of palaeotopography in modelling of glacial isostatic adjustment

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Klemann,  Volker
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/janh

Hagedoorn,  Jan
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Martinec,  Z.
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Klemann, V., Hagedoorn, J., Martinec, Z. (2011): Refinement of palaeotopography in modelling of glacial isostatic adjustment, (Geophysical Research Abstracts, 13, EGU2011-4801, 2011), General Assembly European Geosciences Union (Vienna, Austria 2011).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_243382
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.