江南南部—华南北部前汛期严重旱涝诊断分析

利用江南南部—华南北部区域18个站45年（1951～1995年）4～6月降水资料计算了Z指数，确定出该区域严重涝年（1954、1962、1968、1973、1975年）和严重旱年（1958、1963、1967、1985、1991年）。分析了严重旱涝的频数分布和空间分布的特征，以及印度洋和太平洋整个赤道地区的SSTA、OLR距平场的分布。结果表明旱涝年SSTA、OLR距平场均有明显的差异。

Diagnostic Analysis on the Severe Drought/flood for the Beginning of Flood Season in Southern Part of the South of Yangtze River Valley and Northern South China

Based on the precipitation data of 18 stations for the first summer rainfall (April-June) from 1951 to 1995 in northern South China and southern part of the south of Yangtze River valley, the Z index is calculated, and the severe drought years including 1958,1963,1967,1985 and 1991, as well as the severe flood years including 1954,1962,1968,1973 and 1975 are defined in this region. The characteristics for the frequency distribution and spatial distribution of severe drought/flood are analysed, and the anomalies of SSTA and OLR for the most area of Indian Ocean and Pacific equatorial area are given. The results show that there are obvious differences for the SSTA and OLR anomalies in severe drought/flood years.