Abstract
Since the TOPEX/POSEIDON satellite was successfully launched on Aug. 10 1992, the SSHA time series from the T/P altimeter data has been available for almost ten years, yielding the level 2 data of 0.5° ×0.5° space resolution and 10 day's time resolution, and the level 3 data of 1° × 1° space resolution and 5 day's time resolution. We analyzed the SSHA time series from the T/P altimeter data spanning from Oct. 1992 to Aug. 2002 to extract the information of the SSHA rising and annual and semiannual fluctuations of the SSHA variations with the space resolution of 1° × 1° by using wavelet technique. The results show that the global sea surface height rose about 24.2mm in the last ten years, of which that of Northern Hemisphere rose about 19.0mm and that of Southern Hemisphere rose about 26.9mm. The averages of the amplitudes of the annual and semiannual variability of the global SSHA were 28.8mm and 8.8mm respectively. The annual variation was larger then semiannual variation. The amplitudes of annual SSHA in Northern Hemisphere and Southern Hemisphere were 40.3mm and 21.1mm respectively. The amplitudes of semiannual SSHA in Northern Hemisphere and Southern Hemisphere were 10.9mm and 7.3mm, respectively. The analysis also found the phase jump phenomenon of annual SSHA fluctuation in southern and northern equator warm current regions.
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