Controls on the stable isotopes in precipitation and surface waters across the southeastern Tibetan Plateau

doi:10.1016/j.jhydrol.2016.12.034

	Controls on the stable isotopes in precipitation and surface waters across the southeastern Tibetan Plateau
	Ren, W (Ren, Wei)1,2; Yao, TD (Yao, Tandong)2; Xie, SY (Xie, Shiyou)1; He, Y (He, You)2; Ren, W
刊名	JOURNAL OF HYDROLOGY
	2017
卷号	545 期号:0 页码:276-287
关键词	DEUTERIUM EXCESS ALTITUDINAL VARIATIONS UNITED-STATES RIVER WATERS MASS-BALANCE ICE CORES MONSOON PALEOELEVATION PALEOALTIMETRY DELTA-O-18
DOI	10.1016/j.jhydrol.2016.12.034
文献子类	Article
英文摘要	Constraining temporal and spatial variability in water stable isotopes (delta O-18 and delta D) is requested for interpreting proxy records of paleoclimate/paleoaltimetry. The southeastern Tibetan Plateau (TP) receives large amounts of precipitation in both summer (JJAS) and spring (MAM) and this makes it different from most other parts of the TP where annual precipitation concentrates only in summer. However, our knowledge of controls on precipitation and surface runoff generation in this region is still far from sufficient. In this study, the delta O-18 and delta D of precipitation and stream waters across the southeastern TP were analyzed to investigate moisture sources and empirical isotope-elevation relationships. Herein, seasonal precipitation patterns, moisture trajectories and precipitation isotopes suggest this region is seasonally dominated by the monsoon in summer and the southerlies (from the Bay of Bengal) or a mix of southerlies and westerlies in spring. Spatially, vertical variations in precipitation seasonality exert profound influences on isotopic variability for stream waters. Larger contributions of spring precipitation (with higher delta O-18 and d-excess (d-excess = delta D-8 delta O-18) compared to summer precipitation) vs. summer precipitation in the surface runoff generation at lower elevations account for the uncommon altitudinal decrease in streamwater d-excess. Such a cause also contributes to the slightly greater vertical lapse rates of streamwater delta O-18 (-0.28 to -0.48 parts per thousand/100 m) relative to the Himalayan front. In addition, although a robust delta O-18 elevation relationship is demonstrated based upon our measured and other published data on a broad spatial scale (over a 5200 m elevation range), this relationship is found to deviate from the empirical/theoretical pattern in the Himalayan front, which is also caused by the substantial spring precipitation in the southeastern TP. It is suggested that long-term changes in delta O-18 or delta D of paleowater in this region actually represent both changes in past regional elevations and contributions of summer vs. spring atmospheric circulations. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	自然地理学
WOS研究方向	Engineering; Geology; Water Resources
语种	英语
WOS记录号	WOS:000394399100021
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8339]
专题	青藏高原研究所_图书馆
通讯作者	Ren, W
作者单位	1.Southwest Univ, Sch Geog Sci, Chongqing 400715, Peoples R China. 2.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China.
推荐引用方式 GB/T 7714	Ren, W ,Yao, TD ,Xie, SY ,et al. Controls on the stable isotopes in precipitation and surface waters across the southeastern Tibetan Plateau[J]. JOURNAL OF HYDROLOGY,2017,545(0):276-287.
APA	Ren, W ,Yao, TD ,Xie, SY ,He, Y ,&Ren, W.(2017).Controls on the stable isotopes in precipitation and surface waters across the southeastern Tibetan Plateau.JOURNAL OF HYDROLOGY,545(0),276-287.
MLA	Ren, W ,et al."Controls on the stable isotopes in precipitation and surface waters across the southeastern Tibetan Plateau".JOURNAL OF HYDROLOGY 545.0(2017):276-287.