Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.g51c0264b&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #G51C-0264
Physics
1223 Ocean/Earth/Atmosphere Interactions (3339), 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1249 Tides: Earth, 1255 Tides: Ocean (4560)
Scientific paper
Atmosphere and oceans are, below solid Earth tides, major sources of surface gravity perturbations. In the paper, we show how an estimation of global atmospheric loading using global pressure charts provided by NCEP and ECMWF allows a significant and systematic reduction of surface gravity residues of several superconducting gravimeters (SG) of the GGP (Global Geodynamics Project) network versus the usual and empirical pressure correction using only local pressure data. We also demonstrate that the non-inverted barometer (NIB) hypothesis is definitively not relevant for describing the oceanic response to pressure forcing. The inverted barometer (IB) assumption is shown to be a valid model for periods exceeding a week. We also investigate tidal and non-tidal ocean loading on surface gravity. We compare diurnal and semi-diurnal tidal loading estimated with eight different ocean tidal models to surface gravity observations. Differences between the estimated loading is shown to be larger than the tidal accuracy of all SGs. The precision of the SGs of the GGP network allows also us to detect the contribution of small amplitude non-linear quart-diurnal oceanic tides which appear on major continental shelves. We finally compute the non-tidal oceanic loading using sea-surface height variations derived from Topex/Poseidon altimeter data. The steric effects are estimated using sea-surface temperature and WOA98 data. We show that oceanic circulation induced effects can reach an amplitude of a few microgals, i.e. larger than annual and semi-annual solid Earth tides.
Boy J. J.
Gegout Pascal
Hinderer Jacques
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