气候变化领域集成服务门户(CCPortal): Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes

CCPortal

DOI	10.1016/j.jhydrol.2019.124506
	Runoff dominated by supra-permafrost water in the source region of the Yangtze river using environmental isotopes
	Li, Zongxing; Li, Zongjie; Feng, Qi; Zhang, Baijuan; Gui, Juan; Xue, Jian; Gao, Wende
发表日期	2020
ISSN	0022-1694
EISSN	1879-2707
卷号	582
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.
英文关键词	Runoff; Permafrost; Stable isotope; Accelerating multiphase water transformation; Yangtze River
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS关键词	QINGHAI-TIBET PLATEAU ; STABLE-ISOTOPES ; CLIMATE-CHANGE ; HYDROGRAPH SEPARATION ; GROUNDWATER ; PRECIPITATION ; CATCHMENT ; IMPACTS ; CHINA ; BASIN
WOS记录号	WOS:000517663700040
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239354
作者单位	[Li, Zongxing; Feng, Qi; Gui, Juan; Xue, Jian] 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; [Li, Zongjie; Zhang, Baijuan; Gao, Wende] 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]. 中国科学院西北生态环境资源研究院,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).