Study on the effect of short-term variations in the upper ocean on the atmosphere

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We investigated short-term variations of the upper ocean and their impacts on the atmosphere in the northwestern Pacific Ocean around Japan. It was revealed from an analysis of satellite data that the surface chlorophyll-a quick increase events with quick sea surface temperature (SST) drop tended to occur south of Okinawa and Honshu, and in the Kuroshio-Oyashio Extention region, where cyclones often pass. We also performed numerical experiments by using an ocean-atmosphere coupled regional model, and shown that the diurnal variation of SST can modify precipitation in the Baiu season and the intensity of a typhoon.