摘要
利用ERA-40再分析资料集的风、温度、水汽等再分析资料,分析了华北地区干旱以及北非萨赫勒地区干旱化的气候特征及它们之间的关联,指出在亚非季风区上空存在一个年代际的季风环流异常遥相关波列,正是由于此波列的作用,使得我国华北地区从1965年以后所发生的干旱与北非萨赫勒地区干旱化存在着明显的相关联。并且分析了这两地区的干旱与之相关联的全球气候变化背景,指出由于1965年之后北、南半球气温变化差异的减少导致了亚非季风系统发生了年代际减弱和南撤,从而使得华北和北非萨赫勒地区发生了持续干旱现象。
The ERA-40 reanalysis data of wind, air temperature, water vapour etc. are used to analyze the climatological characteristics of the droughts in North China and the Sahelian region of North Africa and the relationship between them. It may be pointed out from the analyzed results that there is a likely teleconnection wave train in the summer monsoon circulation anomalies over the Asia-African monsoon regions on interdecadal time scale. Just because of the effect of this wave train, there exists an obvious relationship between the droughts occurred in North China from 1965 and the desertification occurred in the Sahelian region of North Africa. Moreover, the background of global climate change associated with the droughts occurred in these two regions is also analyzed in this paper. The results show that after 1965, the decrease of the difference between the air temperature over the Northern Hemisphere and that over the Southern Hemisphere has led to occurrence of the weakening and southward retreat of the Asia-African summer monsoon system on interdecadal time scale, which caused the persistent droughts in North China and the Sahelinan region of North Africa.
出处
《气候与环境研究》
CSCD
北大核心
2006年第3期270-279,共10页
Climatic and Environmental Research
基金
中国科学院知识创新工程重要方向项目KZCX3-SW-218
国家重点基础研究发展规划2004CB418300
2006CB400500
国家自然科学基金委青年项目40305012
关键词
干旱
亚非季风带
南半球
北半球
气温差
drought, Asia-African monsoon zone, difference of air temperature, the Northern Hemisphere, the Southern Hemisphere
