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当前位置: 首页 > 文章 > 长武塬区大气降水中氢氧同位素特征分析 水土保持学报 2008,22 (3) 56-59
Position: Home > Articles > Characteristics of Hydrogen and Oxygen Isotopes in Precipitation on Changwu Tableland Journal of Soil and Water Conservation 2008,22 (3) 56-59

长武塬区大气降水中氢氧同位素特征分析

作  者：
王锐;刘文兆;宋献方
单  位：
中国科学院水利部水土保持研究所;中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室
关键词：
氢氧同位素;降水;大气降水线;环境效应;氘盈余;长武塬区
摘  要：
通过测定长武塬区2005年降水水样的氢氧同位素组成,分析了该区降水氢氧同位素组成的基本特征。结果表明,长武塬区大气降水线方程为δD=7.44δ~(18)O+1.69,其斜率和截距与全球以及我国大气降水线相比均偏小,这与研究区地理位置和气候条件有关;降水氘盈余d值4—6月份较大,大于或接近10,7—10月份则小于10;以天为时间单位采集的次降水,其氢氧同位素组成的温度效应和降水量效应均不显著,而连续2 d长历时降水的雨量效应极显著;降水氢氧同位素组成季节变化明显,春季降水的氢氧同位素值较高,夏季同位素值降低,秋季同位素值最小,这在以次降水量为权重的加权平均值中表现得更加明显。
译  名：
Characteristics of Hydrogen and Oxygen Isotopes in Precipitation on Changwu Tableland
作  者：
WANG Rui~(1,3) LIU Wen-zhao~(1,2,*) SONG Xian-fang~4 (1.Institute of Soil and Water Conservation,CAS & MWR,Yangling,Shaanxi 712100; 2.Institute of Soil and Water Conservation,Northwest A & F University,Yangling,Shaanxi 712100; 3.Graduate University of Chinese Academy of Sciences,Beijing 100039;4.Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographical Sciences and Natural Resources Research,CAS,Beijing 100101)
关键词：
hydrogen and oxygen isotopes;;precipitation;;local meteoric water line (LMWL);;environmental effects;;deuterium excess;;Changwu tableland
摘  要：
Precipitation is the most important component of water cycle process.Hydrogen and oxygen iso- topic compositions of precipitation are closely related to the source of vapor and the meteorologic process of rainfall formation.The isotopic compositions of precipitation over the Changwu tableland in 2005 are stud- ied.Local meteoric water line is fitted asδD=7.44δ~(18)O+1.69.Its slope and intercept are lower than those of global meteoric water line and Chinese meteoric water line,which are related to the geographical and mete- orological characteristics in the area.Deuterium excess shows seasonal variation.The values of deuterium excess are higher than or about 10 from April to June and less than 10 from July to October.Both tempera- ture and rainfall amount have no significant effect on the isotopic compositions of individual rainfall events with one-day-period.For the 2-day-period rainfall events,rainfall amount have significant effect on them. Moreover,the isotopic compositions of precipitation have seasonal variation.TheδD andδ~(18) O values are higher in spring,lower in summer,and much lower in autumn,which is more remarkable in the average ofδD andδ~(18) O when the individual rainfall amount is assigned as a weight.

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