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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Ice Mass Balance and Antarctic Gravity Change: Satellite and Terrestrial Perspectives
verfasst von : Erik R. Ivins, Eric Rignot, Xiaoping Wu, Thomas S. James, Gino Casassa
Erschienen in: Earth Observation with CHAMP
Verlag: Springer Berlin Heidelberg
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Recent advances in the spatial and temporal retrieval of land-based cryospheric change information south of 42.5° allow fairly robust construction of forward model predictions of the time-rate of change in gravity. A map-view prediction is presented for the time-rate of change in geoid,
d
N/
dt
that might be retrieved from the currently orbiting gravity space craft, CHAMP (Challenging Mini-Satellite Payload for Geophysical Research and Application) and/or GRACE (Gravity Recovery and Climate Experiment). Complementary computation of the surface gravity change,
dδg/dt
, is also presented. The latter can be recovered from terrestrial absolute gravity measurements. Also, the computed rate of change Stokes coefficients for degree and order
l, m
1–12 may be used as reliable estimates of the Southern Hemisphere cryospheric change contribution to the global low-degree harmonic variability recorded in multidecadal satellite laser ranging (SLR) data sets.