河南省干旱灾害的变化特征和成因分析

利用河南省历史干旱灾害统计资料和NCEP再分析资料,统计分析了河南旱灾变化特点,从气候背景角度对河南旱灾产生的原因进行了初步研究,以期能对提高气候预测水平和指导农业生产有一定帮助。分析结果表明：（1）河南省旱灾发生频率较高,局部旱灾几乎年年出现,大范围、全省性的大旱也时有发生,同时旱灾也具有明显的年代变化特征;（2）年内降水分配不均,无降水日数多是造成河南干旱频发的成因之一;（3）对大尺度环流特征分析表明,冷、暖空气均偏弱,导致冷、暖空气无法在黄淮流域交汇,也是造成河南省干旱频发的另一原因。

Changing Characteristics and Causes Analysis of Drought Disaster in Henan Province

The characteristics and the cause of drought disasters were analyzed by using of historical statistical data of drought disaster in Henan province and reanalysis data of NCEP.The results showed that the frequency of drought disasters in Henan province was high.Regional drought disaster happened almost every year,and large-scaled drought also occurred frequently.The drought disasters also changed obvious decadal.The distribution of annual precipitation had non-uniform and the rainless days occurred more,which was one of the reasons to droughts frequently in Henan province.Weak cold and warm air mass could not meet at basin of the Yellow river and Huaihe river,which was also helpful drought formation.