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1 temperature and salinity are the two basic physical ocean water mass, the navigation observation and supplemented by other data, we can know the dividing of the Kuroshio, Oyashio, North Pacific Ocean and the Arctic Ocean water masses, determine the front position, intensity, especially the sub Arctic front, and their. 2 the study of air sea interface water vapor mass flux and energy flux. 3 for the observation of other subjects such as CO2 flux, radiation chemistry, marine biology, and provide basic data. 4 for the use of satellite data retrieval. SST can provide calibration based on.