Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.u32a..06p&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #U32A-06
Physics
1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1236 Rheology Of The Lithosphere And Mantle (8160), 1827 Glaciology (1863), 3344 Paleoclimatology, 4556 Sea Level Variations
Scientific paper
Interpretation of the global field of geoide height secular variation that will be obtained once the GRACE observations have been filtered to remove the influence of the tides and various contributions from the seasonal climate cycle will require a high quality model of the process of glacial isostatic adjustment(GIA). Since this process continues to contribute significantly to the secular change of sea level everywhere on Earth's surface, it constitutes a severe contamination of the signal associated with modern climate change that it is the goal of GRACE to more accurately define. A recently developed new model of the global GIA process(Ann. Rev. Earth PLanet. Sci. 32, 111-149,2004) will be described that is expected to constitute a high quality filter of the GRACE observations. The ICE-5G(VM2) model embodies a deglaciation component that is significantly different from it's ICE-4G(VM2) precursor, although the net eustatic rise across the glacial-interglacial transition is almost identical and very close to the oxygen isotope constrained value of ~120m. The new data that have been invoked to develop this refined model include absolute gravity, VLBI and GPS observations from the interior of the North American continent where the GIA process is unconstrained by 14C dated relative sea level histories. The model also incorporates important modifications to the ice unloading histories of Greenland, the British Isles and Eurasia.
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