Resumo

GUO, Jin Yun et al. Temporal-spatial distribution of oceanic vertical deflections determined by TOPEX/Poseidon and Jason-1/2 missions. Earth Sci. Res. J. [online]. 2016, vol.20, n.2, pp.1-5. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v20n2.54402.

Deflections of the Vertical(DOV) are essential data in the geodetic observation reduce, the earth gravity field and geoid model refinement, and the mass earth change. The meridional and prime vertical components of global oceanic DOVs are estimated from altimetry data of TOPEX/Poseidon, Jason-1, and Jason-2, through 1992 to 2013 with the crossover method, to analyze the temporal-spatial distribution of marine DOVs. Comparing with the EGM2008-modelled DOVs, precisions of meridional and prime vertical components can be up to 0.98” and 1.02”, respectively. The time series of annual mean DOVs from 1992 to 2013 are studied to get the annual variation law. Annual changes of meridional and prime vertical components are small over most oceans. But the annual changes are significantover oceans with large submarine topography undulations.The spatial distribution of oceanic DOVs is also analyzed. The absolute DOVs over oceans around lands, islands, and large oceanic trenches are greater than those over the other oceans. The meridional and prime vertical components are consistent withthe longitude and latitude directions, respectively.

Palavras-chave : Deflection of the Vertical (DOV); satellite altimetry; temporal-spatial distribution; crossover point; marine gravity field.

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