Climatic Characteristics of the Summer Drought in 2001 in Inner Mongolia and Its Signal

Based on analysis of the climatic characteristics of the summer drought in 2001 and the investigation of the climatic features of drought/flood from 1739 to 2000 in the central and western area, from 1774 to 2000 in the eastern area in the Inner Mongolia,the change features of previous signals of summer drought in Inner Mongolia area are discussed. The results show that the severe summer drought in Inner Mongolia occurred in next year after the La Nina event, when the Northern Hemisphere polar vortex is stronger in the early winter but weaker in the late winter, Ockotsk high is stronger and the western Pacific high is weaker, lasting three to seven months, from May in former year to April, then, the Ockotsk high is weaker but the western Pacific high is stronger lasting two to six months. These characteristics can be taken for the signals of severe summer drought in Inner Mongolia.

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