Geosat-derived geoid anomalies at medium wavelength

Physics

Scientific paper

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Geoids, Geosat Satellites, Gravity Anomalies, Satellite Altimetry, Topography, Earth Surface, Geopotential, Ground Tracks, Power Spectra

Scientific paper

Medium-wavelength (0-1500 km) geoid anomalies not associated with hotspot swells are derived, and their relationship with topography anomalies are examined on a regional scale (over the Pacific). A full year of Geosat altimeter data of the Exact Repeat Mission are analyzed, and a filtering procedure based on inverse method techniques is developed in order to remove the long-wavelength geoid signal. Cross-spectral analysis carried out on geoid and topography data over the Pacific yields coherence maxima at 750-km and 1100-km wavelengths and admittance values of 2-3 m/km. Observed admittance matches the magnitude and shape of admittance predicted by lithospheric cooling models, suggesting that the lineations are related to regional variations in the plate cooling process. The results suggest a physical relationship between the medium-wavelength lineations and long-lived regional variations in lithospheric cooling which provide evidence of probable temperature variations along spreading ridges.

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