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Regional Models


  Authors: A.N. Marchenko, N.P. Tretyak     Created: 2008    Resp: A.N. Marchenko  
      Status: PUBLIC   

This model is a gravimetric quasi-geoid for the Antarctic region limited by 50° S in latitude. It is based on marine and land gravity anomalies from BGI and ADGRAV databases, and on gravity anomalies computed by KMS from the inversion of satellite altimetry. Mean gravity anomalies are first computed on a 6'x12' grid, filling the gap with EGM96 synthesized data. A remove-restore procedure is then applied by using the EIGEN-CG01C global gravity model up to degree 360 and the GEBCO DTM topography model. The quasi-geoid solution is based on the Sequential Multipole Analysis (SMA) technique approximating the gridded reduced mean gravity anomalies by 20152 radial multipoles with an accuracy of 5 mGal. The obtained quasi-geoid and the corresponding SST model have been assessed by comparison with independent data from 5 tide-gauges stations (Mawson, Davis, Casey, Macquarie Island, Heard Island) of the Australian levelling network, leading to an estimated accuracy of 10 cm. The geoid heights are referred to WGS84 ellipsoid and presented in the usual (Phi, Lambda, Geoid height) form with the resolution 6'x12' (-89.9° < lat < -50.1°; -179.8° < lon < 180° ).

A.N. Marchenko (1998). Parameterization of the Earth's gravity field. Point and line singularities. Lviv Astronomical and Geodetic Society, Lviv, Ukraine.
A.N. Marchenko, K. Tretyak, A. Kulchicky, N.P. Tretyak (2012). The study of the Earth's Gravity Field, Sea Surface Topography and the Crustal movements in the Antarctic area. Lviv Polytechnic National University, Lviv, Ukraine.
A.N. Marchenko, N.P. Tretyak (2016). Regional quasigeoid and sea surface topography model in the Antarctic area. Unpublished extended astract.