Although the DSR-cover/DCR-cover decreases with SST in concert with LCH2001, it was shown that DSR-cover itself increased significantly with SST. Therefore, when we assume the moist air in proportion with DSR-cover, the iris hypothesis is not expected to work over the average situation of the warm water. The effects of large-scale circulation on rain-SST relationship are not as large as expected, except for the larger intensity of the convective rain under the El Nino condition. We have to note that there also exist complicated atmosphere-ocean interactions, as suggested by the different behavior of the Indian Ocean. On the other hand, very robust relationship of DSR properties normalized by DCR values, free from regional differences, is suggested. These relations may become a clue to the variation of rain properties associated with the climate change in future studies. The physical reason of decreasing tendency of DCR and DSR intensity with SST should also be considered.
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