Recent dynamic ocean topography models and their comparison

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Regarding the rapidly growing satellite altimetry database and correspond-ing products worldwide, an investigation of different mean dynamic ocean topog-raphy (MDT) models was assessed to be important for further use in geodetic ap-plications. The efficiency and quality of different MDT models are discussed in view of adopted geoids as reference surfaces. The models used are: 1) The ECCO model based on hydrology and altimetry data, 2) The combined MDT Rio-05 con-structed in CSL AVISO (2005) from data for the period 1993-1999, 3) The com-bined MDT CNES-CLS09 model at the grid points 15'x15' based on altimetry and hydrology data for the period 1993-2007 (CSL AVISO, 2009), 4) The DNSC08MDT solution of mean dynamic topography (Danish National Space Cen-ter) obtained from the geometrical differences between the DNSC08 mean sea sur-face and the EGM2008 geoid model.
The concluding results of the investigation are: 1) statistics of all mean
dyamic topography models leads to the approximately same standard deviations about 70 cm and range from -2 m to 2 m; 2) all differences among various MDT models give much smaller standard deviations about 6 - 15 cm; 3) all such differ-ences among various MDT give larger mean deviation, which can be explained by different geoid models or reference surfaces adopted for each solution; 4) better agreement provides MDT CNES-CLS09 and DNSC08MDT models. As a result, we prefer MDT CNES-CLS09 and DNSC08MDT solutions since their noise level corresponds to an estimated accuracy of modern satellite altimetry data.


Marchenko, A., Tretyak K., Lopyshansky A., Pavliv T. 2010. Recent dynamic ocean topography models and their comparison. Infrastruktura i Ekologia Terenów Wiejskich. Nr 2010/ 11