Reference : Effect of gravitational consistency and mass conservation on seasonal surface mass lo...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/840
Effect of gravitational consistency and mass conservation on seasonal surface mass loading models
English
Clarke, Peter J. [School of Civil Engineering and Geosciences, University of Newcastle]
Lavallée, David A. [School of Civil Engineering and Geosciences, University of Newcastle]
Blewitt, Geoffrey [School of Civil Engineering and Geosciences, University of Newcastle]
Wahr, J. M. [Department of Physics and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado]
van Dam, Tonie mailto [European Center for Geodynamics and Seismology, Walferdange, Luxembourg]
2005
Geophysical Research Letters
American Geophysical Union
32
L08306
1-5
Yes (verified by ORBilu)
International
0094-8276
0094-8276
[en] seasonal surface mass loading ; mass conservation ; space geodesy
[en] Increasingly, models of surface mass loads are used either to correct geodetic time coordinates by removing seasonal and other ‘‘noise’’, or for comparison with other geodetic parameters. However, models of surface loading obtained by simply combining the mass redistribution due to individual phenomena will not in general be self- consistent, in that (i) the implied global water budget will not be mass-conserving, and (ii) the modelled sea level will not be an equipotential surface of Earth’s total gravity field. We force closure of the global water budget by allowing the ‘‘passive’’ ocean to change in mass. This medium-term passive ocean response will not be a uniform change in non- steric ocean surface height, but must necessarily be spatially variable to keep the ‘‘passive’’ ocean surface on an equipotential. Using existing load models, we demonstrate the effects of our consistency theory. Geocenter motion is amplified significantly, by up to 43%.
Researchers
http://hdl.handle.net/10993/840
10.1029/2005GL022441

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