Recent climatic significance of chemical signals in a shallow firn core from an alpine glacier in the South-Asia monsoon region
文献类型：期刊论文
| 作者 | He, YQ; Yao, TO; Theakstone, WH; Cheng, GD; Yang, MX; Chen, T |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2002-02-01 |
| 卷号 | 20期号:3页码:289-296 |
| ISSN号 | 1367-9120 |
| 通讯作者 | He, YQ(yqhe@ns.lzb.ac.cn) |
| 英文摘要 | There are 19 sub-tropical temperate glaciers on Mount Yulong, the southernmost currently glacier-covered area in Eurasia, controlled by the south-western monsoon climate. In the Summer of 1999, a firn core, 10.10 m long, extending down to glacier ice, was recovered in the accumulation area of the largest glacier, Baishui No. I. Periodic variations of climatic signals above 7.8 m depth were apparent, and net accumulation of four years was identified by the annual oscillations of isotopic and ionic composition. The! boundaries of annual accumulation were confirmed by higher values of electrical conductivity and pH, and by dirty refreezing ice layers at the levels of summer surfaces. Calculated mean annual net accumulation from 1994/95 to 1997/98 was 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. The decreasing trend of Na(+)/Cl(-) ratios with increasing depth further reflects a progressive homogenization process caused by meltwater percolation. Concentrations of SO(4)(2-) and NO(3)(-) in the core are quite low. 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 2400-3 100 mm, but this needs to be confirmed by long-term observation of mass balance. (C) 2002 Elsevier Science Ltd. All rights reserved. |
| 收录类别 | SCI ; ISTP |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000172661900012 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556729 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | He, YQ |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Inst, Lanzhou 730000, Peoples R China 2.Univ Manchester, Dept Geog, Manchester M13 9PL, Lancs, England |
| 推荐引用方式 GB/T 7714 | He, YQ,Yao, TO,Theakstone, WH,et al. Recent climatic significance of chemical signals in a shallow firn core from an alpine glacier in the South-Asia monsoon region[J]. JOURNAL OF ASIAN EARTH SCIENCES,2002,20(3):289-296. |
| APA | He, YQ,Yao, TO,Theakstone, WH,Cheng, GD,Yang, MX,&Chen, T.(2002).Recent climatic significance of chemical signals in a shallow firn core from an alpine glacier in the South-Asia monsoon region.JOURNAL OF ASIAN EARTH SCIENCES,20(3),289-296. |
| MLA | He, YQ,et al."Recent climatic significance of chemical signals in a shallow firn core from an alpine glacier in the South-Asia monsoon region".JOURNAL OF ASIAN EARTH SCIENCES 20.3(2002):289-296. |
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来源：寒区旱区环境与工程研究所
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