Environmental Significance of the Stable Isotopes in Precipitation at Different Altitudes in the Tuolai River Basin

doi:10.13227/j.hjkx.201708087

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	Environmental Significance of the Stable Isotopes in Precipitation at Different Altitudes in the Tuolai River Basin
	Li, Yong-Ge 2,3; Li, Zong-Xing 2; Feng, Qi 2; Xiao, Lian-Gui 1; Lü, Yue-Min 2,3; Gui, Juan 4; Yuan, Rui-Feng 4; Zhang, Bai-Juan 5
刊名	Huanjing Kexue/Environmental Science
	2018-06-15
卷号	39 期号:6 页码:2661-2672
关键词	Evaporation Hydrostatic pressure Isotopes Precipitation (chemical) Rivers Vapor pressure Water piping systems Water vapor Watersheds Altitude Correlation coefficient Environmental significance Positive correlations Precipitation events Precipitation samples River basins Stable isotopes
ISSN号	02503301
DOI	10.13227/j.hjkx.201708087
英文摘要	Precipitation samples and meteorological data were collected simultaneously during individual precipitation events at Tuole station (3 367 m a.s.l.) and Jiayuguan station (1 658 m a.s.l.) in the Tuolai River Basin. A study of temporal variation, Local Meteoric Water Lines, and altitude change on precipitation stable isotopes was conducted. The relationships between precipitation stable isotopes and temperature, precipitation, average vapor pressure, and relative humidity were determined in order to explore the environmental significance of the stable isotopes at different altitudes in the middle reaches of the Qilian Mountains. The analysis indicated that the stable isotopes of the precipitation in Tuole and Jiayuguan station were characterized by pronounced seasonal variation, with Tuole having higher δ18O values in summer and autumn and lower δ18O values in spring and winter, while Jiayuguan displays higher δ18O values in spring and lower in other seasons. The d-excess was correlated negatively with δ18O, and the correlation coefficients between δ18O and d-excess decreased with increasing altitude due to weakening sub-cloud evaporation. The slope and intercept of the Local Meteoric Water Lines from Jiayuguan to Tuole rose significantly, showing an increasing trend from low altitude to high altitude. For the precipitation events above 10, δ18O of Tuole was positively correlated with the temperature, but the Jiayuguan results indicated the opposite. Sub-cloud evaporation weakened with high precipitation events in Jiayuguan. δ18O and d-excess were positively correlated with the average vapor pressure, which declined from Tuole to Jiayuguan. Since the water vapor pressure and saturated water vapor pressure increased, it was difficult to form precipitation with decreasing altitude. The local strong sub-cloud evaporation caused δ18O and δD was positive at low altitude, while the effect of moisture recycling is obvious, such that δ18O and δD are negative in high altitude areas. There is no significant positive correlation between the δ18O and the relative humidity of the precipitation in Jiayuguan, while Tuole displays an opposite pattern. The results of the study will provide a scientific basis for further study of precipitation isotopes in the Tuolai River basin. © 2018, Science Press. All right reserved.
语种	中文
出版者	Science Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114877]
专题	兰州理工大学能源与动力工程学院
作者单位	1.Meteorological Administration of Tianjun, Tianjun; 817200, China; 2.Key Laboratory of Ecohydrology of Inland River Basin/Gansu Hydrology and Water Resources Engineering Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou; 730000, China; 3.University of Chinese Academy of Sciences, Beijing; 100049, China; 4.College of Geography and Environmental Science, Northwest Normal University, Lanzhou; 730070, China; 5.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Li, Yong-Ge,Li, Zong-Xing,Feng, Qi,et al. Environmental Significance of the Stable Isotopes in Precipitation at Different Altitudes in the Tuolai River Basin[J]. Huanjing Kexue/Environmental Science,2018,39(6):2661-2672.
APA	Li, Yong-Ge.,Li, Zong-Xing.,Feng, Qi.,Xiao, Lian-Gui.,Lü, Yue-Min.,...&Zhang, Bai-Juan.(2018).Environmental Significance of the Stable Isotopes in Precipitation at Different Altitudes in the Tuolai River Basin.Huanjing Kexue/Environmental Science,39(6),2661-2672.
MLA	Li, Yong-Ge,et al."Environmental Significance of the Stable Isotopes in Precipitation at Different Altitudes in the Tuolai River Basin".Huanjing Kexue/Environmental Science 39.6(2018):2661-2672.