摘要
本文应用正交旋转主分量分析方法,计算分析了我国大陆1952—1987年间大气干旱指数s=ΔT/σ_T-ΔR/σ_R的地域相关和年际变化特征。结果表明,可以将我国大陆上旱涝异常的变化大致按43°N和30°N为分界线划分成三个基本相关的纬带。1954—1957年间和1963、1969年前后大部分地区相对湿润多雨。70年代以来,长江以北相对少雨干旱,气候变化的大趋势与撒亥勒(Sahel),以及英格兰中部和威尔士等地区相类似。年度干旱指数年际变化的短周期大部分地区以2—3年为主,具有准两年振荡的特点。
With the analysis method of the Orthogonally Rotated Principal Component (Varimax Criterion), the regional teleconnection and interannual variability of the atmospheric dryness index, in the period of 1951-1987 in China mainland were investigated.The results indicate that three correlative zones for the annual index of atmospheric dryness might be approximately partitioned by 43 ° N and 30 ° N in China, that the droughts in the north of 30 ° N of China lasted 1970-1986, and that the general trend of climatic variation was similar to that in the Sahel, the central England and the Wales areas, and the dryness index in most part of these regions has the feature of quasi biennial oscillation.
出处
《大气科学》
CSCD
北大核心
1991年第1期43-52,共10页
Chinese Journal of Atmospheric Sciences
关键词
中国
大陆
干旱
指数
年际变化
Orthogonally Rotated Principal Component Analysis, Atmospheric Dryness Index, Regionalization, Interannual Variation.
