Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes

doi:10.1016/j.jhydrol.2019.124506

CORC > 兰州理工大学 > 兰州理工大学

	Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes
	Li, Zongxing 1; Li, Zongjie 2; Feng, Qi 1; Zhang, Baijuan 2; Gui, Juan 1; Xue, Jian 1; Gao, Wende 2
刊名	JOURNAL OF HYDROLOGY
	2020-03
卷号	582
关键词	Runoff Permafrost Stable isotope Accelerating multiphase water transformation Yangtze River
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.124506
英文摘要	Accelerating multiphase water transformation affects runoff processes and components greatly and have changed the spatiotemporal patterns of water resources in the Third Polar Region. The source region of the Yangtze River is one location where accelerated warming has resulted in the gradual extension of the ablation period since 1990. This has caused the acceleration of multiphase water transformation, characterized by increases in the rate of glacial retreat, maximum freezing depth, and annual actual evapotranspiration and by decreased snowfall. In response, the total runoff increased by 53% at the Tuotuohe national hydrological station (TTH) and 6% at the Zhimenda national hydrological station (ZMD) during the periods 1961-1990 and 1991-2017, respectively. Under these conditions, runoff components were being determined based on stable isotope tracing. Substantial seasonal differences in delta O-18 (delta D) among precipitation, river water, supra-permafrost water, and glaciers snow meltwater indicate that the runoff has been replenished by multiple components, and that these first infiltrate the ground, becoming part of the groundwater, and then recharge river water. Supra-permafrost water rather than precipitation now dominates river water. Based on the end-member mixing analysis model, supra-permafrost water, precipitation, and glaciers snow meltwater accounted for 51%, 26%, and 23% of river water at the TTH station from June 2016 to May 2018; the corresponding values at the ZMD station were 49%, 34%, and 17%. Additionally, there are also differences in the seasonal contributions of runoff components to river water. Seasonal variations in the freezing and thawing of the active layer directly trigger the runoff process. Future research should be focused on determining the mechanisms underlying the dynamics of precipitation-supra-permafrost water-runoff, which will aid the assessment of the impacts of an unstable Asian Water Tower on water resources.
资助项目	Second Tibetan Plateau Scientific Expedition and Research Program(STEP)[2019QZKK0405] ; National Key R&D Program of China[SQ2019YFC050024-01] ; Youth Innovation Promotion Association, CAS, China[2013274] ; National Nature Science Foundation of China[91547102][41771077] ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment[SKLLQG1814]
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000517663700040
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/76183]
专题	兰州理工大学能源与动力工程学院
通讯作者	Li, Zongxing; Li, Zongjie
作者单位	1.Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Northwest Inst Ecoenvironm & Resources, Gansu Qilian Mt Rea Environm Res Ctr, Lanzhou 730000, Peoples R China 2.Lanzhou Univ Technol, Coll Energy & Power Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li, Zongxing,Li, Zongjie,Feng, Qi,et al. Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes[J]. JOURNAL OF HYDROLOGY,2020,582.
APA	Li, Zongxing.,Li, Zongjie.,Feng, Qi.,Zhang, Baijuan.,Gui, Juan.,...&Gao, Wende.(2020).Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes.JOURNAL OF HYDROLOGY,582.
MLA	Li, Zongxing,et al."Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes".JOURNAL OF HYDROLOGY 582(2020).