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Sea surface height data from the TOPEX/POSEIDON altimetry satisfy continuous (or periodic) data acquisition and wide observation in a horizontal space, which makes it possible to investigate the typical/dominant spatial and temporal scales of ocean variabilities. Here we estimate nonseparable horizontal space-time decorrelation scales from the TOPEX/ POSEIDON altimeter data, because each ocean phenomenon/ variability is linked in the space and time coordinates. In the analysis procedure the direction of the anisotropy, e.g., the westward propagation of a planetary disturbance, is not assumed a priori, and the data alone decide the direction. Additionally, the observation error in the data is evaluated in the present analysis. The observation error is also an important value for objective analysis schemes and assimilation procedures to decide "weight of the data." This analysis is for the establishment of an optimum interpolation system, for developing the design of an optimum observation network, and for an assimilation system, Comprehensive Ocean Modeling, Prediction, Analysis and Synthesis System in the Kuroshio region (COMPASS-K) ] at the Meteorological Research Institute. 955

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