Unraveling of permafrost hydrological variabilities on Central Qinghai-Tibet Plateau using stable isotopic technique

doi:10.1016/j.scitotenv.2017.06.213

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	Unraveling of permafrost hydrological variabilities on Central Qinghai-Tibet Plateau using stable isotopic technique
	Yang, Yuzhong 2; Wu, Qingbai 1,2; Hou, Yandong 3; Zhang, Zhongqiong 2; Zhan, Jing 2; Gao, Siru 2; Jin, Huijun 2
刊名	Science of the Total Environment
	2017-12-15
卷号	605-606 页码:199-210
关键词	Freezing Hydrology Isotopes Lakes Permafrost Rivers Stream flow Thawing Ground ice Hydrological process Hydrological variability Isotopic characteristics Permafrost degradation Permafrost hydrology Qinghai Tibet plateau Stable isotopes
ISSN号	00489697
DOI	10.1016/j.scitotenv.2017.06.213
英文摘要	Permafrost degradation on the Qinghai-Tibet Plateau (QTP) will substantially alter the surface runoff discharge and generation, which changes the recharge processes and influences the hydrological cycle on the QTP. Hydrological connections between different water bodies and the influence of thawing permafrost (ground ice) are not well understood on the QTP. This study applied water stable isotopic method to investigate the permafrost hydrological variabilities in Beiluhe Basin (BLB) on the QTP. Isotopic variations of precipitation, river flow, thermokarst lake, and ground ice were identified to figure out the moisture source of them, and to elaborate the hydrological connections in permafrost. Results suggested that isotopic seasonality in precipitation is evident, it is showing more positive values in summer season, and negative values in winter season. Stable isotopes of river flow are mainly distributed in the range of precipitation which is indicative of replenishment from precipitation. δ18O, δD of thermokarst lakes are more positive than precipitation, indicative of basin-scale evaporation of lake water. Comparison of δI values in different water bodies shows that hydrology of thermokarst lakes was related to thawing of permafrost (ground ice) and precipitation. Near-surface ground ice in BLB exhibits different isotopic characteristics, and generates a special δD-δ18O relationship (freezing line): δD = 5.81δ18O-23.02, which reflects typical freezing of liquid water. From isotopic analysis, it is inferred that near-surface ground ice was mainly recharged by precipitation and active layer water. Stable isotopic and conceptual model is suggestive of striking hydrological connections between precipitation, river flow, thermokarst lake, and ground ice under degrading permafrost. This research provides fundamental comprehensions into the hydrological processes in permafrost regions on QTP, which should be considered in investigating the influence of thawing permafrost on the hydrological cycle on QTP. © 2017
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	Elsevier B.V., Netherlands
WOS记录号	WOS:000408275500022
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150643]
专题	土木工程学院
作者单位	1.Beiluhe Observation Station of Frozen Soil Environment and Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou; 730000, China; 2.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou; 730000, China; 3.School of Civil Engineering, Lanzhou University of Technology, China
推荐引用方式 GB/T 7714	Yang, Yuzhong,Wu, Qingbai,Hou, Yandong,et al. Unraveling of permafrost hydrological variabilities on Central Qinghai-Tibet Plateau using stable isotopic technique[J]. Science of the Total Environment,2017,605-606:199-210.
APA	Yang, Yuzhong.,Wu, Qingbai.,Hou, Yandong.,Zhang, Zhongqiong.,Zhan, Jing.,...&Jin, Huijun.(2017).Unraveling of permafrost hydrological variabilities on Central Qinghai-Tibet Plateau using stable isotopic technique.Science of the Total Environment,605-606,199-210.
MLA	Yang, Yuzhong,et al."Unraveling of permafrost hydrological variabilities on Central Qinghai-Tibet Plateau using stable isotopic technique".Science of the Total Environment 605-606(2017):199-210.