西北干旱地区大气降水δ^(18)O的特征及水汽来源(英文) 柳鉴容;宋献方;孙晓敏;袁国富;刘鑫;王仕琴 【期刊名称】《地理学报：英文版》 【年(卷),期】2009(19)2 【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 δ18O.The 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 region.The deviations of slope and intercept from the Global Meteoric Water Line indicated the specific regional meteorological conditions.The 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 yearly-scale.Spatial distributions of δ18O have properly portrayed the atmospheric circulation background in each month over Arid Northwestern China.The 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 raindrops.Furthermore, the raindrop suffered a re-evaporation during falling processes, and the precipitation vapor might have been mixed with a quantity of local recycled water vapor.Multiple 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 data.The 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. 【总页数】11页(P164-174) 【关键词】同位素组成;月降水量;西北地区;水汽来源;干旱;多元线性回归方程;可视化效果;气候控制 【作 者】柳鉴容;宋献方;孙晓敏;袁国富;刘鑫;王仕琴 【作者单位】Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;Graduate University of Chinese Academy of Sciences,Beijing 100039,China;CERN Sub-center of Water,Beijing 100101,China 【正文语种】中 文 【中图分类】P588.121;P457.6 【相关文献】 1.武汉市大气降水δD和δ18O变化特征及水汽来源 [J], 谷金钰;张文杰;许文盛;张平仓 2.桂林地区大气降水(大雨、暴雨)的δ18O特征与水汽来源的关系 [J], 朱晓燕;张美良;吴夏;潘谋成 3.三峡库区秭归段大气降水δD和δ18O特征及水汽来源 [J], 王婷;高德强;徐庆;靳翔;张蓓蓓;左海军 因版权原因，仅展示原文概要，查看原文内容请购买 本文来源：https://www.wddqw.com/doc/4d86cd8725fff705cc1755270722192e453658ab.html