Glimatic Warming and Drying Trend and its Impact on Water Resources in Mid Latitude China

The area of mid latitude China, mainly the zones from semi-humid to ariddesert extending from 35°N to 50°N, accounts for 60% or more of the area of China. Since the end of the Little Ice Age, climatic change has shown obviously warming and drying trend. Especially, more stronger change has occurred since 1960's. Under the impact of climatic change, such phenomenon as shrinkage of glaciers and lakes,decrease of runoff, descent of groundwater table and increase of drought frequency and extent etc,have been caused.With a tendency of global warming, climatic drying would continue. However,if the greenhouse effect could cause the increase of the temperature by 2℃ or morein the next century, the climate of mid latitude China could get humid.