摘要
基于中国606个地面台站1951～2008年的逐日降水量和气温资料,采用综合气象干旱指数CI统计分析了中国全国及十大江河流域近60年的干旱变化趋势。结果表明,近60年来,从整体来看,中国干旱面积呈现出弱的增加趋势。干旱持续时间长的几个中心分别位于北方的辽河流域西部、黄河流域东部、海河流域、西南诸河流域东南部等地,最长持续时间可达4个月以上;北方江河流域干旱面积一般表现出增加趋势,其中松花江流域、辽河流域、海河流域干旱面积出现显著的增加趋势,辽河流域、海河流域、黄河流域在20世纪90年代中后期至21世纪前期连续数年出现大范围干旱,南方大多数江河流域干旱面积的变化趋势不明显,只有西南诸河流域有显著的减少趋势。
Based on the calculation results of a Compound Index （CI） of meteorological drought,the variations in drought conditions for ten major river basins and China as a whole are investigated. In recent 60 years,a weak increasing trend of drought areas is found for the entire country. Most northern river basins of China experience upward trends of drought areas,with significant trends being found in the Songhuajiang River basin,the Liaohe River basin,and the Haihe River basin. Severe and prolonged droughts occurred in the areas of Liaohe River,Haihe River,and Yellow River basins during the periods from the late 1990s to the early 2000s. There are no significant long-term upward or downward trends in drought areas in most river basins of southern China,except for the southwestern rivers basin where a significant decreasing trend can be detected.
出处
《气候与环境研究》
CSCD
北大核心
2010年第4期371-378,共8页
Climatic and Environmental Research
基金
国家科技支撑项目2007BAC29B02
公益性行业科研专项200801001
