摘要
中纬度中国,主要指35°N至50°N之间的半湿润至干旱荒漠地带,占中国面积的60％以上,自上世纪末小冰期结束以来,具有鲜明的波动性的增暖和变干趋势,特别是60年代以来更为剧烈。在其影响下,冰川与湖泊萎缩,地表径流减少,地下水位下降,水质恶化,干旱频率和旱灾的严重性都在增加。 在全球变暖的大趋势下,干旱化在近期可能还会继续。但如CO_2及其它微量气体的温室效应导致下世纪升温2℃或更多.重现全新世暖期情景,则中纬度中国会变得湿润起来。而在气候剧变的过渡时期,水旱灾害会进一步增加。
The area of mid latitude China, mainly the zones from semi-humid to arid-desert extending from 35° N, accounts for 60% or more of the area of China. Since the end of the Little Ice Age, climatic change has shown obviously wanning 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 more in the next century, the climate of mid latitude China could get humid.
出处
《水科学进展》
EI
CAS
CSCD
1991年第4期217-223,共7页
Advances in Water Science
