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Humidity Effect and Its Influence on the Seasonal Distribution of Precipitation δ~(18)O in Monsoon Regions
引用本文:章新平,刘晶淼,何元庆,田立德,姚檀栋.Humidity Effect and Its Influence on the Seasonal Distribution of Precipitation δ~(18)O in Monsoon Regions[J].大气科学进展,2005(2).
作者姓名:章新平  刘晶淼  何元庆  田立德  姚檀栋
作者单位:College of Resources and Environment Sciences Hunan Normal University,Changsha 410081,Chinese Academy of Meteorological Sciences Beijing 100081,Cold and Arid Regions Environmental and Engineering Research Institute Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute Lanzhou 730000
摘    要:The humidity effect, namely the markedly positive correlation between the stable isotopic ratio in precipitation and the dew-point deficit ATd in the atmosphere, is put forward firstly and the relationships between the δ18O in precipitation and ATd are analyzed for the Urumqi and Kunming stations, which have completely different climatic characteristics. Although the seasonal variations in δ18O and △Td exhibit differences between the two stations, their humidity effect is notable. The correlation coefficient and its confidence level of the humidity effect are higher than those of the amount effect at Kunming, showing the marked influence of the humidity conditions in the atmosphere on stable isotopes in precipitation. Using a kinetic model for stable isotopic fractionation, and according to the seasonal distribution of mean monthly temperature at 500 hPa at Kunming, the variations of the δ18O in condensate in cloud are simulated. A very good agreement between the seasonal variations of the simulated

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