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DOI	10.1016/j.jhydrol.2017.04.037
	River recharge sources and the partitioning of catchment evapotranspiration fluxes as revealed by stable isotope signals in a typical high-elevation arid catchment
	Guo, Xiaoyu; Tian, Lide; Wang, Lei; Yu, Wusheng; Qu, Dongmei
通讯作者	Tian, LD (通讯作者)
发表日期	2017
ISSN	0022-1694
EISSN	1879-2707
起始页码	616
结束页码	630
卷号	549
英文摘要	Catchment-scale hydrological cycles are expected to suffer more extremes under a background of climate change. Quantifying hydrological changes in high and remote areas is practically challenging. However, stable isotopes in river water can be seen to vary, dependent upon the combined influence exerted by recharge sources and local climatic conditions; the study of river water stable isotopes can therefore provide a meaningful method for delineating catchment-scale hydrological studies. In this study, we present high-resolution time series of river delta C-18 and d-excess values; additionally, we identify the seasonal dynamics of river recharge sources and major components of the catchment-scale water balance, together with precipitation and groundwater isotopes, and concurrent meteorological data recorded in Magazangbu catchment on the northwestern Tibetan Plateau (TP). Using isotopic analysis, and within a proportional framework, we partitioned the isotopic fractionation (El) or non-fractionation (E2) from soil evaporation fluxes (E-soil) apparent in different processes, using NDVI (Normal Differential Vegetation Index) data collected by MODIS satellites to calculate the vegetation fractional coverage (VFC), and Global Land Data Assimilation System (GLDAS) records to determine evapotranspiration data (ET). Finally, the contributions made by each ET component (E-soil and plant transpiration) to total catchment ET were computed for the high and remote northwestern TP. Our results show that: (1) river 8180 values were high in summer and low in winter, while d-excess values displayed a contrary seasonal cycle; (2) for the monsoon period, precipitation contributed 60.6% to Magazangbu catchment runoff. Deeper groundwater was the main water source for the winter low base flow, and shallow groundwater or high elevation snowmelt was the principal component of the spring thaw and autumn freezing periods; and (3) a substantial proportion of E-soil (96.4% annually; 92.2% during monsoon) was consumed without isotopic fractionation (E2); plant transpiration (T) constituted less than half of total ET (41% annually, 29% during monsoon) in Magazangbu catchment. This calculation of river recharge sources and partitioning of catchment ET components using isotopic signals and MODIS NDVI data or GLDAS ET data provide new methods for hydrological studies in high and remote areas. These results provide important catchment-scale water-balance information which is very useful to climate models conducted in a high-elevation arid environment. (C) 2017 Elsevier B.V. All rights reserved.
关键词	TIBETAN PLATEAU WATER-BALANCE SOIL EVAPORATION CLIMATE-CHANGE OXYGEN ISOTOPES SISPAT-ISOTOPE ASIAN MONSOON MASS-BALANCE PRECIPITATION TRANSPIRATION
英文关键词	River stable isotopes; Recharge sources; Partitioning of evapotranspiration fluxes; Water balance; Northwestern Tibetan Plateau
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000403855500049
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258987
推荐引用方式 GB/T 7714	Guo, Xiaoyu,Tian, Lide,Wang, Lei,et al. River recharge sources and the partitioning of catchment evapotranspiration fluxes as revealed by stable isotope signals in a typical high-elevation arid catchment[J]. 中国科学院青藏高原研究所,2017,549.
APA	Guo, Xiaoyu,Tian, Lide,Wang, Lei,Yu, Wusheng,&Qu, Dongmei.(2017).River recharge sources and the partitioning of catchment evapotranspiration fluxes as revealed by stable isotope signals in a typical high-elevation arid catchment.JOURNAL OF HYDROLOGY,549.
MLA	Guo, Xiaoyu,et al."River recharge sources and the partitioning of catchment evapotranspiration fluxes as revealed by stable isotope signals in a typical high-elevation arid catchment".JOURNAL OF HYDROLOGY 549(2017).