Temporal behavior of temperature-salinity fields in the Kuroshio recirculation gyre region and their influences on the atmospheric field

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We investigated temperature and salinity fields in the Kuroshio recirculation gyre region south of Japan, by using the Argo floats, satellite-derived altimetry data, sea surface temperature (SST) data, and atmospheric reanalysis data. The positive anomalies of temperature in the recirculation gyre region were mainly formed by the horizontal heat advection due to the westward flow associated with the recirculation, and then a vigorous heat was released to the overlying atmosphere in winter in the state of the positive SST anomaly. The salinity in the recirculation gyre region was caused by rainfall in the warm season, which was related to the number of low pressures passing over the recirculation gyre region associated with the location of summertime North Pacific subtropical high.