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DOI	10.1007/s11434-007-0401-z
	Water isotope variations in the snow pack and summer precipitation at July 1 Glacier, Qilian Mountains in northwest China
	Zhou ShiQiao; Nakawo, Masayoshi; Sakai, Akiko; Matsuda, Yoshihiro; Duan KeQin; Pu JianChen
发表日期	2007
ISSN	1001-6538
起始页码	2963
结束页码	2972
卷号	52 期号:21
英文摘要	This paper presents the stable isotope data of the snow pack and summer precipitation collected at the July 1 Glacier, Qilian Mountains in northwest China and analyses their relationships with meteorological factors. On an event scale, there is no temperature effect on the delta O-18 values in the summer precipitation, whereas the amount effect is shown to be clear. By tracing the moisture transport history and comparing the precipitation with its isotopic composition, it is shown that this amount effect not only reflects the change in moisture trajectory, which is related to the monsoon activities, but is also associated with the cooling degree of vapor in the cloud, the evaporation of falling raindrops and the isotopic exchange between the falling drops and the atmospheric vapor. As very little precipitation occurs in winter, the snow pack profile mainly represents the precipitation in the other three seasons. There are low precipitation delta O-18 ratios in summer and high ratios in spring and autumn. The Meteoric Water Line (MLW) for the summer precipitation is delta D = 7.6 delta O-18 + 13.3, which is similar to that at Delingha, located in the south rim of the Qilian Mountains. The MWL for the snow pack is delta D = 10.4 delta O-18 + 41.4, showing a large slope and intercept. The deuterium excess (d) of the snow pack is positively correlated with delta O-18, indicating that both d and delta O-18 decrease from spring to summer and increase from early autumn to early spring. This then results in the high slope and intercept of the MWL. Seasonal fluctuations of d in the snow pack indicate the change of moisture source and trajectory. During spring and autumn, the moisture originates from continental recycling or rapid evaporation over relatively warm water bodies like Black, Caspian and Aral Seas when the dry westerly air masses pass over them, hence very high d values in precipitation are formed. During summer, the monsoon is responsible for the low d values. This indicates that the monsoon can reach the western part of the Qilian Mountains.
关键词	TIBETAN PLATEAU DEUTERIUM EXCESS STABLE-ISOTOPE ICE CORE MOISTURE TRANSPORT DELTA-O-18 RECORDS SURFACE ASIA
英文关键词	Tibetan Plateau; Qilian Mountains; July 1 Glacier; precipitation; snow; firn; stable isotopes; meteoric water line; deuterium excess
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000250463400014
来源期刊	CHINESE SCIENCE BULLETIN
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/257519
推荐引用方式 GB/T 7714	Zhou ShiQiao,Nakawo, Masayoshi,Sakai, Akiko,et al. Water isotope variations in the snow pack and summer precipitation at July 1 Glacier, Qilian Mountains in northwest China[J]. 中国科学院青藏高原研究所,2007,52(21).
APA	Zhou ShiQiao,Nakawo, Masayoshi,Sakai, Akiko,Matsuda, Yoshihiro,Duan KeQin,&Pu JianChen.(2007).Water isotope variations in the snow pack and summer precipitation at July 1 Glacier, Qilian Mountains in northwest China.CHINESE SCIENCE BULLETIN,52(21).
MLA	Zhou ShiQiao,et al."Water isotope variations in the snow pack and summer precipitation at July 1 Glacier, Qilian Mountains in northwest China".CHINESE SCIENCE BULLETIN 52.21(2007).