Climatic Features of Rainstorm Days in South China
我国南方暴雨一些气候特征的统计分析

With data of the rainstorm days of 59 stations in South China in the period of 1958-1995, by three dimensional EOF and wavelet analysis, we investigated climatic features of the rainstorm days in South China, e.g., their spatial distributions, seasonal, interannual and interdecadal variations. The results show that the annual mean rainstorm days has small ascending tendency in the period of 1958 -1995. There are 32-, 10-, 5-, and 2- 3-year periods in the rainstorm days. These oscillations have interdecadal changes with 10-year period in the 1950- 1960s, 5-year period in the 1970s, 10- and 3-year periods in the 1980s, and 10-year period in the 1990s. Rainstorm days have obvious seasonal variations. More rainstorm days are during April- October and the maximum is in June. The maximum values appears in South China. There are obvious differences on climatic features among rainstorm days, hail days, and thunderstorm days in South China. This implies that the cause of the three kinds of weather phenomena is very complex.