伊犁河谷大气降水同位素特征及环境意义  

Stable Isotopic Characteristic and Environmental Significance of Ili River Valley Precipitation

作　　者：蒋新华 苏晨[2,3] 程中双 陈宗宇 Jiang Xinhua;Su Chen;Cheng Zhongshuang;Chen Zongyu(Hydrology & engineering Geology Depatment,Xinjiang Bureau of Geology and Mineral Resource,Urumqi,Xinjiang,830091,China;Institute of Hydrogeology & Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,Hebei,050061,China;Key Laboratory of Groundwater Science and Engineering,Ministry of Natural Resource,Shijiazhuang,Hebei,050061,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第一水文工程地质大队,新疆乌鲁木齐830091 [2]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [3]自然资源部地下水科学与工程重点实验室,河北石家庄050061

出　　处：《新疆地质》2019年第3期378-381,共4页Xinjiang Geology

基　　金：中国地质调查局地质调查项目（12120115047801）;国家自然基金项目（41702283）联合资助

摘　　要：为研究伊犁谷地降水同位素特征及陆地内循环对其的影响,为流域水循环研究提供科学依据,于2016年在伊宁、尼勒克和新源气象站采集降水同位素样品。采用回归对照法,讨论降水氘氧稳定同位素的影响因素。研究表明,研究区大气降水线方程为δD=7.96δ^18O+10.37,与全球大气降水线较接近,水汽主要由西风带输送;氘氧同位素夏季富集冬季贫化而氘盈余无规律变化,由于降水过程不仅受温度效应,还受到水汽陆地再循环影响。冬夏季样品在D-^18O关系图中分布特征,证明冬夏影响降水同位素本地水循环因素不同,夏季以云下蒸发为主。根据对氘过量计算的夏季降水雨滴蒸发分数为4.1%~16.2%,再次证明夏季云下蒸发效应明显,而在冬季云下蒸发效应几乎不会发生。The characterize of climate is dried and intense evaporation in Ili river valley.The precipitation's isotope char- acteristics is impacted remarkably by local recycled moisture.Therefore, precipitation isotope samples were collected in yining,nileke and xinyuan stations for stable isotopes of precipitation in 2016.The value of δD and δ^18O showed relative- ly enriched during the winter summer and more depleted in winter,while the deuterium surplus showed irregular chang- es.It means that precipitation was affected by strong local water vapor cycle in addition to the temperature effect. The lo- cal meteoric water line was δD=7.96δ^18O + 10.37,which is very closely with the global meteoric water line.It suggested that the water vapor source is relatively simple.The distribution that samples of winter and summer in the δD-δ^18O rela- tion diagram indicated that the factors modifed the local water cycle of precipitation isotopes are different in winter and summer,and the summer samples are mainly affected by moisture recycling.According to the semi-quantitative estima- tion of deuterium excess,the moisture recycling fraction in raindrops is 4.1%~16.2% in summer precipitation, which proved that the evaporation effect of moisture recycling was obvious in summer,but hardly occurred in winter.

关 键 词：伊犁河谷 大气降水 氘盈余 二次蒸发 

分 类 号：P512.31[天文地球—地质学]