Glacial-isostatic adjustment and recent sea-level change: the influence of 
Pleistocene ice-sheet evolution on tide-gauge measurements

Hagedoorn, Jan; Martinec, Z.; Wolf, D.; Klemann, Volker; 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum; 1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum; Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

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Glacial-isostatic adjustment and recent sea-level change: the influence of Pleistocene ice-sheet evolution on tide-gauge measurements

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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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Wolf, D.
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Klemann, Volker
Deutsches GeoForschungsZentrum;

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Hagedoorn, J., Martinec, Z., Wolf, D., Klemann, V. (2004): Glacial-isostatic adjustment and recent sea-level change: the influence of Pleistocene ice-sheet evolution on tide-gauge measurements, (EOS, Transactions, American Geophysical Union, 85(17), Suppl.), CGU-AGU-SEG-EEGS 2004 Joint Assembly (Montreal 2004) (Montreal, Canada).

https://gfzpublic.gfz-potsdam.de/pubman/item/item_231172

Abstract

The solution to the sea-level equation describing the redistribution of glacial melt water in the oceans is implemented in conjunction with the spectral-finite element method (Martinec, 2000) of modelling glacial-isostatic adjustment (GIA). The main feature of this method is that it solves the field equations governing GIA in the time domain, where a radially symmetric, self-gravitating, incompressible earth model consisting of a fluid core, a Maxwell-viscoelastic lower and upper mantle, and an elastic lithosphere has been adopted in the present study. The additional contribution to sea-level caused by the variation of the Earth's rotation due to the ice-water mass redistribution is determined by means of the Liouville equation. For predicting the GIA-induced sea-level change, three different global models of the Pleistocene deglaciation and several viscosity stratifications are used. We compare the predicted postglacial sea-level change induced by the Pleistocene deglaciation with a set of globally distributed sea-level index points and evaluate the acceptability of the underlying earth and ice models. The best-fitting models are employed to remove the GIA-induced contribution to the recent sea-level change recorded by a set of Fennoscandian tide-gauge stations. In future studies, the reduced tide-gauge trends may serve as a datum when studying the relation between recent ice-mass change and absolute sea-level rise. Martinec,Z., 2000. Spectral-finite element method approach to three-dimensional viscoelstic relaxation in a spherical earth. Geophys. J. Int., 142, 117-141.