Distribution Characters and Its Control Factors of Stable Isotope in Precipitation over China
Distribution Characters and Its Control Factors of Stable Isotope in Precipitation over China
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发表时间：
2010
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通讯作者：
Z. Fuying
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作者：
Z. Fuying
利用IAEA、WMO、GNIP的观测资料，分析了中国降水中稳定同位素的时空变化特征及其影响因素。结果表明，中国降水中稳定同位素总体存在明显的大陆效应和高度效应。对于局地大气水线，研究区之间存在区域差异，内陆地区各站冬、夏半年也有明显差异，降水中稳定同位素的季节变化模式不同，（δ和d-过剩）推断不同季节影响这些地区的气团不同，降水中稳定同位素的长期年际变化与季风指数和ENSO指数的相关说明ENSO与稳定同位素有明显的正相关，但并不总是通过影响降水量而引起稳定同位素的变化，重点分析了降水量和温度效应，指出，在中国沿海和西南季风区，降水量是主导因子，而在不受季风影响的北领地，气温是主导因子，两者在交叉区共同作用。
The temporal and spatial variations of stable isotope in precipitation over China and its control factors are analyzed based on the observations from IAEA\WMO\GNIP.The results show that the overall stable isotope in precipitation in China has obvious continental and altitude effects.For the Local Meteoric Water Line,the regional differences exist among the studying areas,and there also are obvious differences between winter and summer semi-years at the individual stations of inland area,which reveals the different characters of water vapour mass.The various seasonal variation patterns of stable isotope in precipitation(δ and d-excess) infer that there are different air masses influencing these areas at different seasons.The correlations of long term interannual variations of stable isotope in precipitation with monsoon index and ENSO index interpret that ENSO has an obvious positive relation with the stable isotope,but not always cause the stable isotope variations through the influence on the amount of precipitation.With the emphasis on analyzing the amount and temperature effects,we point out that,the amount of precipitation is the dominative factor in the monsoon areas of China Coast and Southwest China,the temperature is the main factor in the northern territory unaffected by monsoon,and the both effects work together in the intersectant zone.