干旱区研究2024，Vol.41Issue(11)：1853-1863,11.DOI:10.13866/j.azr.2024.11.06
那棱格勒河流域氢氧同位素特征及其指示意义
Hydrogen and oxygen isotopic characteristics and indicative significance in the Nalenggele River
摘要
Abstract
In this study,63 samples comprising atmospheric precipitation,river water,groundwater,lake surface brine,and intercrystaline bittern were collected from the Nalenggele River.These samples were analyzed to as-sess the distribution characteristics and influencing factors of hydrogen and oxygen isotope,as well as deuterium surplus.The key findings are as follows:(1)The δD and δ18 O values of atmospheric precipitation in the study area are higher than the average values across China.Due to the combined effect of evaporation and water vapor recir-culation,the slope of the meteoric water line in the study area is lower than the global meteoric water line but higher than that of other drainage basins in the northwest arid zone.The East Asian monsoon,which transports water vapor over long distances,is the primary factor contributing to the low deuterium surplus in the atmospher-ic precipitation of the study area in August.(2)The river water line slope in the study area is smaller than that of the global meteoric water line.The deuterium surplus in river water is negatively correlated with δ18 O and TDS(Total dissolved solids),which is attributed to isotopic fractionation caused by evaporation.The river is primarily recharged by atmospheric precipitation from southern mountainous areas.Variations in isotopic elevation effects result in differences in δD and δ18 O values across different sections of the Nalenggele River.(3)Groundwater-sur-face water interactions,along with the groundwater recharge from multiple sources in the southern mountainous areas,cause the slope and intercept of the groundwater lines to be larger than those of both the global and local meteoric water lines.(4)The hydrogen and oxygen isotopes of surface brine and intercrystaline brine show an"oxygen drift"phenomenon,with deuterium surplus values falling below zero.This is attributed to excessive frac-tionation induced by evaporation.The deuterium surplus value in intercrystaline is lower than that of surface brine,likely due to the dissolution and filtration of salt minerals.关键词
氢氧同位素/氘盈余/干旱区流域/那棱格勒河Key words
hydrogen and oxygen isotopes/deuterium surplus/arid watershed/Nalenggele River引用本文复制引用
张寿川,赵春涛,安亚涛,刘凯,余冬梅,陈亮,李庆宽,王建萍..那棱格勒河流域氢氧同位素特征及其指示意义[J].干旱区研究,2024,41(11):1853-1863,11.基金项目
第二次青藏高原综合科学考察研究项目(2022QZKK0201) （2022QZKK0201）
青海省盐湖地质与环境重点实验室开放课题项目(2024-KFKT-B10) （2024-KFKT-B10）
中国地质科学院基本科研业务费(JKY202406) （JKY202406）
国家自然科学基金(U20A2088) （U20A2088）
盐湖资源综合开发与利用项目(2023ZXKYA05100) （2023ZXKYA05100）
