干旱区研究

干旱区研究 ›› 2011, Vol. 28 ›› Issue (6): 950-956.

• 气候及其灾害 • 上一篇    下一篇

乌鲁木齐河源1号冰川雪坑δ18O剖面特征与气候的关系

 李亚举1, 张明军1,2, 李忠勤1,2, 王圣杰1, 王飞腾2   

    1. 西北师范大学 地理与环境科学学院，甘肃 兰州 730070
    2. 中国科学院寒区旱区环境与工程研究所 冰冻圈科学国家重点实验室/天山冰川观测试验站，甘肃 兰州 730000
  • 收稿日期:2010-11-16 修回日期:2011-02-25 出版日期:2011-11-15 发布日期:2012-01-16
  • 通讯作者: 张明军.E-mail：mjzhang2004@163.com
  • 作者简介:李亚举（1988－），男，河南平顶山人，硕士研究生，主要从事环境地球化学研究. E-mail：liyaju100@126.com
  • 基金资助:

    国家自然科学基金项目（41161012，40701035，40631001，40571033，40701034）；教育部新世纪优秀人才支持计划项目（NCET-10-0019）；陇原青年创新人才扶持计划项目；国家重点基础研究发展规划（973）项目（2010CB951003，2007CB411501）；中国科学院知识创新工程重要方向项目（KZCX2-YW-127）；冰冻圈科学国家重点实验室自主研究项目资助；西北师范大学知识与科技创新工程创新团队项目（NWNU-KJCXGC-03-66）和科研骨干培育项目（NWNU-KJCXGC-03-78）

Relationship between Profile Features of δ18O in Snow Pits over a Mountain Glacier and Local Climate—A Case Study on Glacier No.1 at the Headwaters 
of the Urumqi River in the Tianshan Mountains

 LI  Ya-Ju1, ZHANG  Ming-Jun1,2, LI  Zhong-Qin1,2, WANG  Sheng-Jie1, WANG  Fei-Teng2   

  1.  
    1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
    2. State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station, Cold and Arid Regions Environmental 
      and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2010-11-16 Revised:2011-02-25 Online:2011-11-15 Published:2012-01-16

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摘要： 004年10月至2005年9月，在天山乌鲁木齐河源1号冰川积累区采集了16组雪坑样品。利用雪坑中δ18O资料，分析干季和湿季冰川雪坑δ18O剖面特征与气候的关系。结果表明：δ18O变化主要集中在雪坑上部，在距底部附加冰130 cm以下变化不大，且维持在较高值。其中，干季雪层剖面上部基本反映了积累期温度的变化，湿季不同雪层之间的同位素差异变小，峰值削弱，反映了同位素分馏在干湿季的不同作用，体现了同位素后沉积作用的富集与均质化效应的季节差异。

关键词: 冰川雪坑, 氧同位素, 干季, 湿季, 气候, 1号冰川, 乌鲁木齐河

Abstract: During the period from October 2004 to September 2005, snow samples were collected from 16 snow pits at the accumulation zone of Glacier No. 1 at the headwaters of the Urumqi River in east Tianshan Mountains. According to the δ18O data of the snow samples, the relationship between  δ18O in the snow pits over the glacier in different seasons and local climate was discussed. The result indicated that an evident profile characteristic was displayed in different periods (dry season or wet season). In general, a significant variation occurred at the upper snow pits, and a high value was steadily maintained at the bottom (within 130 cm to superimposed ice layer). A snow stratigraphy was a record of temperature variation during accumulation period in dry season; in wet season, however, variation range of  δ18O was reduced, and the peak was dropped down. In dry season, isotope value was mainly affected by partial melting and refreezing process of surface snow, snow/firn texture transformation and exchange of atmospheric moisture, but most information of  δ18O variation in snow pits was kept. In wet season, distribution of δ18O  in snow pits was strongly affected by enrichment of melt water infiltration and homogenizing process, some typical values (e.g. peaks) were smoothed; so from the top to the button, the  δ18O value was homogenized more and more significantly. In conclusion, the δ18O  value in the snowpack at the accumulation zone of Glacier No. 1 at the headwaters of the Urumqi River reflects mainly the local temperature variation in dry season, but it was significantly affected by fractionation and homogenizing process. Due to the complex process of fractionation in wet season and the limited time density, a further investigation will be needed in the future, especially for the improvement in the sampling spatiotemporal interval and quantification of explanations.

Key words: snow pit, oxygen isotope, dry season, wet season, climate, Glacier No.1, Urumqi River

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