In addition,the spatial distribution of severe flood and drought in North China is investigated with EOF analysis and the relationship between North China summerprecipitation and North Arctic sea-ice in spring is also discussed.

• 分析了华北地区夏季旱涝的年代际变化特征 ,然后对该地区 4 9a的 Z指数场进行 EOF分析 ,讨论了华北地区夏季旱涝的空间分布特征。