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地球科学进展  2006, Vol. 21 Issue (11): 1164-1170    DOI: 10.11867/j.issn.1001-8166.2006.11.1164
研究论文     
乌鲁木齐河源1号冰川不溶微粒的季节变化特征
尤晓妮1,李忠勤2,王飞腾2,朱宇曼2
1.天水师范学院,甘肃 天水 741000;2.中国科学院寒区旱区环境与工程研究所,甘肃 兰州 730000
Seasonal Evolution of Insoluble Microparticles Stratigraphy in Glacier No.1 Percolation Zone, Eastern Tianshan, China
You Xiaoni1,Li Zhongqin2,Wang Feiteng2,Zhu Yuman2
1.Tianshui Teacherc College, Tianshui 741000,China; 2.Key Laboratory of Ice Core and Clod Regions Environment, CAREERI, CAS,Lanzhou 730000, China
 全文: PDF(205 KB)  
摘要:

冰芯中的不溶微粒是反映大气粉尘的良好指标,亦是冰芯定年的重要方法。为了探究不溶微粒在雪层中的季节变化特征,对采自乌鲁木齐河源1号冰川4 130 m处的雪冰样品进行不溶微粒分析。表层雪中粗微粒浓度在一年中有2个峰值,分别出现在12~3月、6~9月;总微粒只有一个峰值区,出现在4~8月。对比同期气象资料发现,其受降水、大气环流以及局地风影响显著。结合雪层物理剖面和微粒在雪层中的浓度发现:污化层是粗颗粒(直径大于10 μm)聚集的区域。对该粒径范围的微粒浓度峰值进行跟踪,发现不溶微粒在雪层中的浓度和位置变化与融水、物理成冰过程密切相关。

关键词: 数量浓度1号冰川不溶微粒季节变化    
Abstract:

The atmospheric dust is one of the most important factors in the global climate changes. Its effects include the scatter and reflect of solar insolation, the supply to the Iron fertilizer to ocean, and its restrain to rain. The microparticles record in ice cores is an excellent proxy for atmospheric dust. Therefore,the processes involved in the evolution of vertical profiles of microparticle concentrations as well as their seasonal variation in surface snow were studied by weekly sampling a snow pit from September 2003 to September 2004 on Glacier No.1 in the eastern Tianshan. The development of the microparticle stratigraphy in the snow pit is closely related to the physical development of the snow-firn pack. The sampling site is located at 4130 m asl in the percolation zone of the glacier, and in addition to the effects of sublimation and wind erosion, melting plays a crucial role in both the physical and chemical evolution processes. During the winter season, aerosol concentrations in the surface layers are altered slightly by sublimation and wind erosion, and the concentrations are further modified as the wet season begins in late April. In contrast, aerosol stratigraphy in the deeper layers remains relatively unchanged through the winter. In early summer, as melting occurs in the upper part of the snow-firn pack, meltwater carries microparticles to different depths in the underlying snow-firn layers. At the end of the ablation season, all of the surface elements might be leached out from the upper layers.

Key words: Glacier No.1    Insoluble particles    Number concentration    Seasonal evolution.
收稿日期: 2006-04-07 出版日期: 2006-11-15
:  P343.6  
基金资助:

中国科学院寒区旱区环境与工程研究所引进国外杰出人才基金项目(编号CACX2003101);国家自然科学基金项目“天山乌鲁木齐河源1号冰川与奎屯河哈希勒根51号冰川冰雪过程观测与研究”(编号:40371028)和“干旱区周边山地冰芯中不溶微粒与粉尘记录研究”(编号:40301009)和“2000年来高分辨率气候环境记录研究”(编号:90102005);国家自然科学基金创新群体项目资助.

通讯作者: 尤晓妮     E-mail: zhuatang@tom.com
作者简介: 尤晓妮(1980-),女,甘肃陇南人,讲师,主要从事冰雪化学与地理教学和研究工作.E-mail:zhuatang@tom.com
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引用本文:

尤晓妮,李忠勤,王飞腾,朱宇曼. 乌鲁木齐河源1号冰川不溶微粒的季节变化特征[J]. 地球科学进展, 2006, 21(11): 1164-1170.

You Xiaoni,Li Zhongqin,Wang Feiteng,Zhu Yuman. Seasonal Evolution of Insoluble Microparticles Stratigraphy in Glacier No.1 Percolation Zone, Eastern Tianshan, China. Advances in Earth Science, 2006, 21(11): 1164-1170.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2006.11.1164        http://www.adearth.ac.cn/CN/Y2006/V21/I11/1164

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