| 西北干旱地区大气降水δ18O的特征及水汽来源 |
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| 引用本文： | 柳鉴容,宋献方,孙晓敏,袁国富,刘鑫,王仕琴.西北干旱地区大气降水δ18O的特征及水汽来源[J].地理学报(英文版),2009,19(2):164-174. |
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| 作者姓名： | 柳鉴容 宋献方 孙晓敏 袁国富 刘鑫 王仕琴 |
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| 作者单位： | |
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| 基金项目： | 国家自然科学基金，Foundation of Isotopes in Precipitation of Chinese Ecosystem Research Network |
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| 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=7.42 δ18O+1.38, based on the 95 ob-tained 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 pre-cipitation 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 estab-lished 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.
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| 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 |
| 收稿时间： | 23 July 2009 |
Isotopic composition of precipitation over Arid Northwestern China and its implications for the water vapor origin |
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| Jianrong Liu,Xianfang Song,Xiaomin Sun,Guofu Yuan,Xin Liu,Shiqin Wang.Isotopic composition of precipitation over Arid Northwestern China and its implications for the water vapor origin[J].Journal of Geographical Sciences,2009,19(2):164-174. |
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| Authors: | Jianrong Liu Xianfang Song Xiaomin Sun Guofu Yuan Xin Liu Shiqin Wang |
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| Institution: | (1) Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China;(3) CERN Sub-center of Water, Beijing, 100101, China |
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| Abstract: | 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 (°C)−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 quantitative
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.
Foundation: National Natural Science Foundation of China, No.40830636; No.40671034; Foundation of Isotopes in Precipitation of Chinese
Ecosystem Research Network
Author: Liu Jianrong (1982–), Ph.D Candidate, specialized in isotope hydrology and water cycle. |
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| Keywords: | Arid Northwestern China (ANC) δ 18O precipitation water vapor origin |
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