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Detailed 1×1° gravimetric Indian Ocean geoid and comparison with GEOS-3 radar altimeter geoid profiles |
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| Authors: | Hans-Gert Kahle Michael Chapman Manik Talwani |
| Institution: | Institut für Geophysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland and Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964, USA;Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964, USA |
| Abstract: | Summary. A new set of 1×1° mean free-air anomalies in the Indian Ocean is determined on the basis of previously published free-air anomaly maps (Talwani & Kahle) and the most recent Lamont surface ship gravity measurements. The data are then used to compute a (total) 1×1° gravimetric Indian Ocean geoid. The computation is carried out by combining the Goddard Space Flight Center (GSFC) GEM-6 geoid and a difference geoid that corresponds to the differences between the set of 1×1° surface gravity values and the GEM-6 gravity anomalies. The difference geoid is highest over the Madagascar Ridge (+ 20 m) and lowest over the Timor Trough (-30 m). The total geoid is compared with GEOS-3 radar altimeter derived geoid profiles and geophysical implications are discussed. |
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