Effect of gravitational consistency and mass conservation on seasonal surface mass loading models

Details Effect of gravitational consistency and mass conservation on seasonal surface mass loading models Effect of gravitational consistency and mass conservation on seasonal surface mass loading models

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3208306c&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 8, CiteID L08306

Other

12

Geodesy And Gravity: Non-Tectonic Deformation, Geodesy And Gravity: Mass Balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532), Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Geodesy And Gravity: Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), Geodesy And Gravity: Reference Systems

Scientific paper

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%.

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