Dryland Expansion in Northern China from 1948 to 2008

作     者：LI Yue HUANG Jianping JI Mingxia RAN Jinjiang 

作者机构：Key Laboratory for Semi-Arid Climate Change of the Ministry of EducationCollege of Atmospheric Sciences Lanzhou University 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2015年第32卷第6期

页      面：870-876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：jointly supported by the National Basic Research Program of China (Grant No. 2012CB 955301) the National Science Foundation of China (Grant Nos. 41175134 and 41305060) a China 111 project (Grant No. B13045) 

主　　题：aridity index dryland expansion climate variation northern China 

摘      要：This study examines the expansion of drylands and regional climate change in northern China by analyzing the variations in aridity index （AI）, surface air temperature （SAT）, precipitation and potential evapotranspiration （PET） from 1948 to 2008. It is found that the drylands of northern China have expanded remarkably in the last 61 years. The area of drylands of the last 15 years （1994--2008） is 0.65 × 106 km2 （12%） larger than that in the period 1948-62. The boundary of drylands has extended eastward over Northeast China by about 2 °of longitude and by about 1° of latitude to the south along the middle- to-lower reaches of the Yellow River. A zonal band of expansion of semi-arid regions has occurred, stretching from western Heilongjiang Province to southern Gansu Province, while shifts to the east of semi-arid regions in dry subhumid regions have also occurred. Results show that the aridity trend of drylands in northern China is highly correlated with the long-term trend of precipitation and PET, and the expansion of semi-arid regions plays a dominant role in the areal extent of drylands, which is nearly 10 times larger than that in arid and subhumid regions.