When summer monsoon intensity is weak (strong), drought (flood) frequently happen in the North China Plane.
夏季风偏强(弱)年份，华北平原多发生雨涝(干旱)。
Moreover, by studying prophase variety character of the Northwest Pacific subtropical high pressure its effect on the change of distribution of summer drought and flood in Jiangsu is analyzed.
此外，通过研究前期西太平洋副热带高压的变化特征，分析其对江苏省夏季旱涝分布变化的影响。
In the context of ECMWF height data, investigation is conducted of the decadal mean and anomaly characteristics of major summer monsoon systems in May, 1985 (of drought) and 1991 (severe flood).
利用ECMWF高度场资料，详细分析了1985年（旱年）和1991年（涝年）5月主要季风环流系统的旬平均和旬距平特征。
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