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Spectral analysis of quasi-stationary sea surface topography from GRACE mission

Science China Earth Sciences 2005年第11期48卷 2040-2048页

作者： ZHANG Zizhan1,2 & LU Yang1,3 1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3. Unite Center for Astro-geodymics Research, Chinese Academy of Sciences, Shanghai 200030, China Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Graduate School of the Chinese Academy of Sciences Beijing China Unite Center for Astro-geodymics Research Chinese Academy of Sciences Shanghai China

During the last two decades satellite altimetry has offered an abundance of meas-urements of the sea surface resulting in the improvement of global mean sea surface height (MSSH) and marine geoid determination. On the other hand, with the launching of new genera-tion gravity satellites, some high accuracy long-wavelength gravity models are available. These breakthroughs give us a great opportunity for new estimation of quasi-stationary sea surface topography (QSST). In this paper, the new gravity model ggm01C derived from GRACE mission is briefly presented, and a new global high precision and high-resolution QSST is determined based on the ggm01C model and the global MSSH. The spectral features of the QSST esti-mated by ggm01C and EGM96 gravity model to degree/order 200 are discussed by spectral analysis. As a result, the QSST is mainly composed of long waves, medium waves partially and short waves scarcely, its power spectral structures are different between the zonal direction and the meridional direction, there are great differences between the two models, which maybe ex-plain why the ocean currents derived from the two gravity models by Tapley show different pat-terns.

关键词： quasi-stationary sea surface topography, mean sea surface height, ggm01, fast Fourier transform, spectral analysis

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