Abstract
The interdecadal change in seasonality of rainfall around 1992/1993 in South China and its possible reasons were investigated, using the station data and NCEP/NCAR reanalysis. The bimodality pattern in rainfall is a salient climatological feature in South China. The present analysis reveals that the typical bimodality feature becomes unconspicuous with postponement and enhancement in the first rainfall peak after 1992/1993. The first rainfall peak occurred in pentad 30 (P30) before 1992/1993, while the rainfall peak postponed to P32 ~ P33 after 1992/1993. This postponement leads to the increase in precipitation in summer, and the decrease in spring. The changes in heavy and torrential rain amount have major contribution to the change in the total rainfall.
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