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DOI	10.1016/j.quaint.2020.09.052
	Stable isotopes of precipitation in Nepal Himalaya highlight the topographic influence on moisture transport
	Acharya, Sunil; Yang, Xiaoxin; Yao, Tandong; Shrestha, Dibas
通讯作者	Yang, XX (通讯作者)
发表日期	2020
ISSN	1040-6182
EISSN	1873-4553
起始页码	22
结束页码	30
卷号	565
英文摘要	The Nepal Himalaya is a transition zone for pollutants transport from the South Asia onto the Tibetan Plateau, with the moist convection identified as dominating the chemical composition that would be transported onto the Plateau. Yet little is known regarding the atmospheric water vapor transport over this region, and how the summer monsoon flows would interact with local topography, with traces detectable from ground sample and observations. The stable oxygen and hydrogen isotopes in precipitation (delta O-18(p) and delta D-p) are important tracers for understanding various hydrological processes. This study reports, for the first time, stable isotope data in daily precipitation at five stations along a north-south transect on the southern slope of Himalaya, with altitudes ranging from 102 m to 5050 m above sea level (a.s.l). The altitude effect of delta O-18(p) across the region of interest is apparent with an altitudinal lapse rate as 0.17 parts per thousand/100 m. Seasonal trends in delta O-18(p) and dDp show low values during June-September and higher values during October-May at all of the study sites, with the noticeable decrease of delta O-18(p) during summer indicative of the presence of the Indian monsoon over the eastern Nepal Himalaya. The average d-excess values in the summer precipitation increase with altitudes til 3800 m a.s.l before decreasing afterward to 5050 m a.s.l. This corroborates with previous meteorological discovery in the region, and probably confirms the replacement of prevailing westerly by the southerly monsoon flows during summer monsoon season.
关键词	DEUTERIUM EXCESS TIBETAN PLATEAU SURFACE WATERS MONSOON SOUTHERN DELTA-O-18 O-18 PALEOELEVATION SIMULATION CONVECTION
英文关键词	Stable isotopes in precipitation; Altitude; Monsoon; Southern slope of himalaya
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000591580600003
来源期刊	QUATERNARY INTERNATIONAL
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/259889
推荐引用方式 GB/T 7714	Acharya, Sunil,Yang, Xiaoxin,Yao, Tandong,et al. Stable isotopes of precipitation in Nepal Himalaya highlight the topographic influence on moisture transport[J]. 中国科学院青藏高原研究所,2020,565.
APA	Acharya, Sunil,Yang, Xiaoxin,Yao, Tandong,&Shrestha, Dibas.(2020).Stable isotopes of precipitation in Nepal Himalaya highlight the topographic influence on moisture transport.QUATERNARY INTERNATIONAL,565.
MLA	Acharya, Sunil,et al."Stable isotopes of precipitation in Nepal Himalaya highlight the topographic influence on moisture transport".QUATERNARY INTERNATIONAL 565(2020).