Retrieval of surface loading and geocenter motion from a new combination of GRACE, modeled OBP and reprocessed GPS data


Contact
roelof [ at ] gfz-potsdam.de

Abstract

Variations in continental water storage, ocean and atmosphere cause changes in the gravitational potential of the Earth. Additionally, the solid Earth deforms noticeably under its load, which can be detected by a network of permanent GPS stations. The conservation of linear momentum implies that a shift of the center of gravity of the surface load is accompanied by a shift of the solid part of the Earth. Here, we combine GRACE gravimetry, homogeneously processed GPS site displacements, and modeled Ocean Bottom Pressure (OBP) in a least squares inversion. This approach yields weekly estimates of global surface loading, including a consistent treatment of the geocenter motion. Furthermore, we describe the updated spatially varying OBP error, used in the inversion. The inversion results are compared against a globally distributed set of in-situ bottom pressure recorders. Additionally, we propagate the weekly solutions back to the GPS site displacements and asses to what extent the measured GPS site displacements can be explained by surface loading.



Item Type
Conference (Poster)
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Grace Science Team Meeting, 11 Nov 2010 - 12 Nov 2010, Potsdam.
Eprint ID
32520
Cite as
Rietbroek, R. , Fritsche, M. , Brunnabend, S. E. , Gebler, M. , Daras, I. , Kusche, J. , Schröter, J. , Flechtner, F. and Dietrich, R. (2010): Retrieval of surface loading and geocenter motion from a new combination of GRACE, modeled OBP and reprocessed GPS data , Grace Science Team Meeting, Potsdam, 11 November 2010 - 12 November 2010 .


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