Using the NCAR/NCEP reanalysis （1958-1999）, COADS monthly data（1945-1993） and Kuroshio transport observation from various sources covering 1980-1997, we studied mainly the relationship between Kuroshio transport and ocean-atmosphere interaction in the area northeast of Taiwan in Northwest Pacific （NWP） during winter. First, we employed composite analysis to understand simple corresponding relationship between Z500 geopotential height difference in north hemisphere and net heat flux difference in NWP from large Kuroshio transport years to small Kuroshio transport years. ,When larger Kuroshio transport is very different from smaller Kuroshio transport in the period, the net heat in the NWP would be released to the atmosphere, resulting in the occurrence of large low-pressure anomaly in the areas from southeastern Japan to Aleutian. With singular value decomposition （SVD） analysis, we further confirmed that in winter the air-sea interaction in NWP releases net heat to the atmosphere, which corresponds to the low-pressure anomaly in NWP and high-pressure anomalies in Nei Mongol （Inner Mongolia） and in North America. In addition, the year of strong air-sea interaction in NWP largely corresponds to the year of large Kuroshio transport. Having related the Kuroshio flux to the first principle component obtained with SVD using lead or lag correlation, we discovered that when Kuroshio transport lead by two months, it could best match the air-sea interaction in NWP in winter. In conclusion, we believe that that the Kuroshio plays an important role in winter air-sea interaction in NWP for transporting heat. In other words, the warm advection of the Kuroshio in late fall sustains the winter air-sea interaction in NWP.
Oceanologia Et Limnologia Sinica