西北地区大气降水δ18O 的特征及水汽来源

doi:10.11821/xb200801002

Abstract

Abstract:

In order to reveal the characteristics and climatic controls on the stable isotope composition in precipitation over Northwest China, seven stations have been selected from the Chinese Network of Isotopes in Precipitation (CHNIP). During the year 2005, monthly precipitation samples have been collected and analyzed for the composition of δ¹⁸O . The established local meteoric water line "D = 7.05δ¹⁸O - 2.17, based on the 50 monthly samples obtained, could be treated as isotope input functions across the region. The deviations of the slope and the intercept from the Global Meteoric Water Line indicated the specific regional meteorological conditions over Northwest China. The monthly δ¹⁸O values were characterized by a strong correlation with the surface air temperature and a weak correlation with precipitation amount. However, if only the % values during summer period have been taken into account, the amount effect visualized. Spatial distributions of δ¹⁸O have properly portrayed the atmospheric circulation background in each month over Northwest China. The quantitative simulation of δ¹⁸O, which involved a Rayleigh fractionation model and a kinetic fractional model, demonstrated that the kinetic fractionation was the dominating function of condensation of raindrops. Furthermore, the raindrops suffered re-evaporation during the falling process, and the precipitation vapor has been mixed with a quantity of local recycled water vapor. A multiple linear regression equation and a δ¹⁸O-T relation were gained by using meteorological parameters to evaluate physical controls on the long-term values. The established δ¹⁸O-T relation, which has been based on the present-day precipitation, was the first step of quantitatively reconstructing the paleo-climate.

Key words: Northwest China, δ¹⁸O, precipitation, water vapour source

LIU Jianrong,SONG Xianfang,YUAN Guofu,SUN Xiaomin,LIU Xin,CHEN Feng,WANG Zhimin,WANG Shiqin. Characteristics of δ¹⁸O in Precipitation over Northwest China and Its Water Vapor Sources[J].Acta Geographica Sinica, 2008, 63(1): 12-22.

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Characteristics of δ¹⁸O in Precipitation over Northwest China and Its Water Vapor Sources

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Characteristics of δ18O in Precipitation over Northwest China and Its Water Vapor Sources

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Characteristics of δ¹⁸O in Precipitation over Northwest China and Its Water Vapor Sources