Constraints on Glacial Isostatic Adjustment from GOCE and Sea Level Data

摘要

Current constraints on the glacial isostatic adjustment (GIA) process are mainly provided by relative sea-level data and GPS measurements. Due to a lack of resolving power in the shallow earth (down to about 200 km), these data sets only provide weak constraints on the shallow viscosity structure and the thickness of the lithosphere. Future high-resolution gravity data, as expected from ESA’s Gravity field and steady-state Ocean Circulation Explorer (GOCE) launched on March 17, 2009, are predicted to provide additional information on the shallow earth, more specifically the viscosity structure. Here we present an overview of recent developments in extracting information on rheology and stratification of the shallow earth from high-resolution quasi-steady gravity and geoid data to be obtained from GOCE. Keywords Crustal deformation - geoid and gravity anomalies - glacial isostatic adjustment - GOCE - sea-level change - self-gravitation PACS 91.10.Kg - 91.10.Op - 91.10.Qm - 91.32.De - 91.32.Gh - 91.35.Gf - 91.50.Kx