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	Climatic records in a firn core from an Alpine temperate glacier on Mt. Yulong, southeastern part of the Tibetan Plateau
	He, YQ; Yao, TD; Cheng, CD; Yang, MX
刊名	EPISODES
	2001-03-01
卷号	24期号:1页码:13-18
ISSN号	0705-3797
通讯作者	He, YQ()
英文摘要	Mr. Yulong is the southernmost glacier-covered area in Eurasia, including China. There are 19 sub-tropical temperate glaciers on the mountain, controlled by the southwestern monsoon climate. In the summer of 1999, a firm core, 10.10 m long, extending down to glacier ice, was recovered in the accumulation area of the largest glacier Baishui No. 1. Periodic variations of climatic signals above 7.8 m depth were apparent, and net accumulation of four years was identified bq the annual oscillations of isotopic and ionic composition. The boundaries of annual accumulation were confirmed by higher values of electrical conductivity, and pH, and bq dirty refreezing ice layers at the levels of summer surfaces. Calculated mean annual net accumulation from 1994/1995 to 1997/1998 tt,ns about 900 mm water equivalent. The amplitude of isotopic variations in the profile decreased with increasing depth, and isotopic homogenization occurred below 7.8 m as a result of meltwater percolation. Variations of delta (18)O above 7.8 m showed an approximate correlation with the winter climatic trend at Lijiang station, 25 km away. Concentrations of Ca(2+) and Mg(2+) were much higher than those of Na(+) and K(+), indicating that the air masses for precipitation were mainly from a continental source, and that the core material accumulated during the winter period. The close correspondence of Cl(-) and Na(+) indicated their common origin. Very low concentrations of SO(4)(2-) and NO(3)(-) suggest that pollution caused by human activities is guile low in the area, The mean annual net accumulation in the core and the estimated ablation indicate that the average annual precipitation above the glacier's equilibrium line is 2400-3150 mm, but this needs to be confirmed by long-term observation of mass balance.
收录类别	SCI
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
语种	英语
出版者	GEOLOGICAL SOC INDIA
WOS记录号	WOS:000168029700004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556674
专题	寒区旱区环境与工程研究所
通讯作者	He, YQ
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 73000, Peoples R China
推荐引用方式 GB/T 7714	He, YQ,Yao, TD,Cheng, CD,et al. Climatic records in a firn core from an Alpine temperate glacier on Mt. Yulong, southeastern part of the Tibetan Plateau[J]. EPISODES,2001,24(1):13-18.
APA	He, YQ,Yao, TD,Cheng, CD,&Yang, MX.(2001).Climatic records in a firn core from an Alpine temperate glacier on Mt. Yulong, southeastern part of the Tibetan Plateau.EPISODES,24(1),13-18.
MLA	He, YQ,et al."Climatic records in a firn core from an Alpine temperate glacier on Mt. Yulong, southeastern part of the Tibetan Plateau".EPISODES 24.1(2001):13-18.

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