Compositions of hydrogen and oxygen isotope values of Yellow River water and the response to climate change
FAN Bai-ling1,2, ZHANG Dong3, TAO Zheng-hua4, ZHAO Zhi-qi2
1. Guizhou Minzu University, Guiyang 550025, China;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, China Academy of Sciences, Guiyang 550002, China;
3. Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China;
4. Institute of Geographic Sciences and Natural Resources Research, China Academy of Sciences, Beijing 100101
To better understand the source changes and the response of river water to climate change, waters in mainstream and tributaries in Yellow River Basin were sampled from July to August 2012, and temporal and spatial variations of hydrogen and oxygen isotope values in water samples were analyzed. The results showed that (1) Excluding source water, the values for hydrogen, oxygen isotope, and d excess in mainstream waters in Yellow River ranged from-97.2‰ to-62.9‰ with mean value of-72.2‰, and from-13.0‰ to-8.7‰ with mean value of-9.9‰, and from 4.1‰ to 11.0‰ with mean value of 7.0‰, respectively. For tributary water, the values for hydrogen and oxygen isotope varied from-103.8‰ to-30.5‰ with mean value of-68.9‰ and from-13.7‰ to-1.5‰ with mean value of-9.2‰, respectively, and the d excess varied between-18.5‰ and 13.2‰ with mean value of 4.5‰; (2) The hydrogen and oxygen isotope values in water from the upper-stream of Lanzhou station and middle-stream of Yellow river were more negative than those of water from upper-stream between Lanzhou station and Toudaoguai station and the low-stream, while the d excess values decreased gradually along the flow path; (3) The Na+/Cl- molar ratios varied from 0.94 to 3.02. The mean value of Na+/Cl- molar ratio was 1.02 in source water, and 1.58 in mainstream water above Lanzhou station, and 1.30 in mainstream water between Lanzhou station and Toudaoguai station, and 1.79 in middle-stream water and 1.41 in low-stream water. The negative correlation between Na+/Cl- molar ratio and oxygen isotope values of river water indicated that the Yellow River waters were mainly controlled by atmospheric deposition, groundwater recharge and evaporation; (4) Compared with results of previous studies, it was found that since 2000, the annual water flux of Yellow River increased gradually, the second-evaporation effect on the upper-stream river water decreased, and the evaporation effect on middle and low stream water also decreased, indicating that the climate in Yellow River Basin was becoming less dry.
范百龄, 张东, 陶正华, 赵志琦. 黄河水氢、氧同位素组成特征及其气候变化响应[J]. 中国环境科学, 2017, 37(5): 1906-1914.
FAN Bai-ling, ZHANG Dong, TAO Zheng-hua, ZHAO Zhi-qi. Compositions of hydrogen and oxygen isotope values of Yellow River water and the response to climate change. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(5): 1906-1914.
Wang L, Hu F, Yin L, et al. Hydrochemical and isotopic study of groundwater in the Yinchuan plain, China [J]. Environmental Earth Sciences, 2013,69(6):2037-2057.
Fan B L, Zhao Z Q, Tao F X, et al. Characteristics of carbonate, evaporite and silicate weathering in Huanghe River basin: A comparison among the upstream, midstream and downstream [J]. Journal of Asian Earth Sciences, 2014,96:17-26.
Yao Z, Liu J, Huang H, et al. Characteristics of isotope in precipitation, river water and lake water in the Manasarovar basin of Qinghai-Tibet Plateau [J]. Environmental Geology, 2009,57(3): 551-556.
[31]
Cui B L, Li, X Y. Stable isotopes reveal sources of precipitation in the Qinghai Lake Basin of the northeastern Tibetan Plateau [J]. Science of Total Environment, 2015,527-528:26-37.
Li F, Pan G, Tang C, et al. Recharge source and hydrogeochemical evolution of shallow groundwater in a complex alluvial fan system, southwest of North China Plain [J]. Environmental Geology, 2007,55(5):1109-1122.
[34]
Froehlich K, Gibson J J, Aggarwal P. Deuterium excess in precipitation and its climatological significance [C]//Study of Environmental Change Using Isotope Techniques. Proc. Intern. Conf. 2001:54-66.