Computer Science
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........24b&link_type=abstract
Ph.D. Thesis Maryland Univ., College Park.
Computer Science
Cooling, Free Convection, Geodesy, Geoids, Lithosphere, Ocean Surface, Spectrum Analysis, Transfer Functions, Venus Surface, Cape Verde, Fir Filters, Indian Ocean, Isostasy, Pacific Ocean, Pioneer Venus 1 Spacecraft
Scientific paper
Cross-spectral analysis was used to study the relationship between mean sea surface height (geoid) and bathymetry in 16 deg x 16 deg blocks in the oceans. The admittances (spectral transfer functions) obtained from this analysis were compared with thermomechanical models of the lithosphere and sublithosphere to determine modes of topographic compensation in different parts of the oceans. Peak admittances at short wavelengths indicate that loads are supported by the mechanical strength of the lithosphere, while peak admittances at long wavelengths are indicative of lithospheric cooling or dynamic sublithospheric processes. Models of upper mantle convection predict higher admittances at long wavelengths than do models of lithospheric cooling. In most areas the observed admittances can be explained by models of the thermomechanical properties of the lithosphere, but in the eastern Pacific Ocean, the northern Indian Ocean, and the Cape Verde Rise high long-wavelength admittances are evidence for upper mantle convection. Observed Pioneer Venus orbiter gravity profiles over Aphrodite Terra were compared to profiles predicted from models of thermal isostasy, mantle convection, and Airy compensation using finite impulse response filters.
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