Isotopic composition of precipitation over Arid Northwestern China and its implications for the water vapor origin

作     者：柳鉴容 宋献方 孙晓敏 袁国富 刘鑫 王仕琴 LIU Jianrong;SONG Xianfang;SUN Xiaomin;YUAN Guofu;LIU Xin;WANG Shiqin

作者机构：Key Laboratory of Water Cycle and Related Land Surface ProcessesInstitute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Graduate University of Chinese Academy of SciencesBeijing 100039China CERN Sub-center of WaterBeijing 100101China 

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

年 卷 期：2009年第19卷第2期

页      面：164-174页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：National Natural Science Foundation of China,No.40830636 No.40671034 Foundation of Isotopes in Precipitation of Chinese Ecosystem Research Network 

主　　题：Arid Northwestern China (ANC) δ^18O precipitation water vapor origin 

摘      要：In order to reveal the characteristics and climatic controls on the stable isotopic composition of precipitation over Arid Northwestern China, eight stations have been selected from Chinese Network of Isotopes in Precipitation(CHNIP).During the year 2005 and 2006, monthly precipitation samples have been collected and analyzed for the composition of δD and δ*** established local meteoric water line δD=7.42δ18O+1.38, based on the 95 obtained monthly composite samples, could be treated as isotopic input function across the *** deviations of slope and intercept from the Global Meteoric Water Line indicated the specific regional meteorological *** monthly δ18O values were characterized by a positive correlation with surface air temperature(δ18O(‰) =0.33 T(℃)-13.12).The amount effect visualized during summer period(δ18O(‰) =-0.04P(mm)-3.44) though not appeared at a whole *** distributions of δ18O have properly portrayed the atmospheric circulation background in each month over Arid Northwestern *** quan-titative simulation of δ18O, which involved a Rayleigh fractionation and a kinetic fractionation, demonstrated that the latter one was the dominating function of condensation of ***, the raindrop suffered a re-evaporation during falling processes, and the precipitation vapor might have been mixed with a quantity of local recycled water *** linear regression equations and a δ18O-T relation have been gained by using meteorological parameters and δ18O data to evaluate physical controls on the long-term *** established δ18O-T relation, which has been based on the present-day precipitation, could be considered as a first step of quantitatively reconstructing the historical environmental climate.