摘要
近来,严中伟等利用COADS及我国的观测资料,分析指出了北半球夏季自北非、印度、我国中部至日本一带,在60年代出现了降水突发性减少的气候跃变。作者曾分析过近30多年来我国的年度大气干旱指数及其年际变化,指出我国大陆长江以北的变化趋势,与Sahel地区。
After the regionalization of the winter, summer and annual Atmospheric Drought Indexes (ADI) over China based on the data of monthly precipitation and monthly mean temperature with the orthogonally Rotated Principal Component(RPC) analysis, the Student's 't' test and other statistic tests were applied to the subsam-ples of the regional ADI over a time span of 1-2 decades. It was emphasized that abrupt changes were also significant for the winter and annual ADI in the northern part of China besides for the summer.
出处
《气象学报》
CSCD
北大核心
1993年第2期237-240,共4页
Acta Meteorologica Sinica
基金
国家自然科学基金
