duration: Sep 2005 - Aug 2008 

In cooperation with: TU München, Uni Bonn, TU Dresden, AWI Bremerhaven
supported by: Geotechnologien research program, joint effort of German Research Council (DFG) and Ministry of Education and Research (BMBF)

This project intends to achive an advanced scientific benefit from the satellite gravity field mission GRACE by increasing the accuracy of its Level-1 and Level-2 products. This is reached through an integrated performance assessment of the gravity field sensor system and through an updated atmosphere-ocean de-aliasing product as well as the application of a new atmospheric tide model. Subsequently, alternative approaches to generate gravity field solutions are implemented and the resulting monthly mean solutions are evaluated against in-situ ocean bottom pressure observations.In particular, Section 1.5 is involved in updating the atmosphere-ocean dealiasing product by replacing the formerly used barotropic ocean model with the Ocean Model for Circulation and Tides (OMCT). Acquisition of latest available atmospheric data from the European Centre for Medium-Range Weather Forecasts (ECMWF) and preparation as forcing fields for OMCT has been fully automated in order to allow the calculation of ocean mass anomalies with 3 days latency only. Currently, 6 hourly ocean mass anomalies in terms of spherical harmonics are released bi-weekly to the GRACE project via the ISDC data portal of GFZ Potsdam. 

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