Interdecadal fluctuation of dry and wet climate boundaries in China in the past 50 years

作     者：Yang Jian-ping Ding Yong-jian Chen Ren-sheng Liu Lian-you 

作者机构：Cold and Arid Regions Environmental and Engineering Research Institute CAS Lanzhou China Institute of Resource and Environmental Sciences Beijing Normal University Beijing China 

出 版 物：《Journal of Geographical Sciences》 (地理学报（英文版）)

年 卷 期：2002年第12卷第2期

页      面：87-93页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：The Knowledge Innovation Project of CAS NO. KZCX1-10-06 

主　　题：China the index of aridity dry and wet climate boundary fluctuation 

摘      要：Based on the mean yearly precipitation and the total yearly evaporation data of 295 meteorological stations in China in 1951-1999, the aridity index is calculated in this paper. According to the aridity index, the climatic regions in China are classified into three types, namely, arid region, semi-arid region and humid region. Dry and wet climate boundaries in China fluctuate markedly and differentiate greatly in each region in the past 50 years. The fluctuation amplitudes are 20-400 km in Northeast China, 40-400 km in North China, 30-350 km in the eastern part of Northwest China and 40-370 km in Southwest China. Before the 1980s (including 1980), the climate tended to be dry in Northeast China and North China, to be wet in the eastern part of Northwest China and very wet in Southwest China. Since the 1990s there have been dry signs in Southwest China, the eastern part of Northwest China and North China. The climate becomes wetter in Northeast China. Semi-arid region is the transitional zone between humid and arid regions, the monsoon edge belt in China, and the susceptible region of environmental evolution. At the end of the 1960s dry and wet climate in China witnessed abrupt changes, changing wetness into dryness. Dry and wet climate boundaries show the fluctuation characteristics of the whole shifts and the opposite fluctuations of eastward, westward, southward and northward directions. The fluctuations of climatic boundaries and the dry and wet variations of climate have distinctive interdecadal features.