| 祁连山七一冰川表面运动特征最新观测研究 |
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| 引用本文： | 王坤,井哲帆,吴玉伟,邓宇峰.祁连山七一冰川表面运动特征最新观测研究[J].冰川冻土,2014,36(3):537-545. |
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| 作者姓名： | 王坤 井哲帆 吴玉伟 邓宇峰 |
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| 作者单位： | 1. 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, 甘肃 兰州 730000;2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 全球变化研究国家重大科学研究计划项目(2010CB951404);中国科学院重点部署项目(KJZD-EW-G03-04);国家自然科学基金项目(41071043)资助 |
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| 摘 要： | 为了保持对祁连山七一冰川运动变化情况观测的连续性，进一步揭示全球气候变暖背景下山岳冰川的运动变化规律，对布设在七一冰川表面的花杆进行了定期观测，获取了2012年7-8月以及2013年8-9月冰川考察期间的最新观测数据（花杆位置、冰川末端边界以及物质平衡等数据资料），通过对数据进行分析，获得了七一冰川表面的运动状况以及末端进退变化情况. 结果表明：空间分布特征方面，七一冰川在横剖面以及纵剖面的运动保持了一般山岳冰川的运动规律；横剖面上，主流线附近冰川运动速度较两侧运动速度要大；纵剖面上，由冰川末端到零物质平衡线，冰川运动速度逐渐增大；运动方向上，七一冰川运动速度矢量大多沿主流线向下运动，或者稍微偏离主流线一定方向. 在冰川运动速度时间分布特征方面，七一冰川在消融季与非消融季的运动速度差异显著，消融季运动速度要明显大于非消融季运动速度. 最近几十年，七一冰川整体运动速度呈现出了逐年减小的趋势. 在2012年8月至2013年8月期间，冰川末端退缩了大约5～7 m，退缩较为显著.
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| 关 键 词： | 七一冰川 表面运动 GPS 特征 |
| 收稿时间： | 2013-11-20 |
| 修稿时间： | 2014-03-17 |
Latest survey and study of surface flow features of the Qiyi Glacierin the Qilian Mountains |
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| WANG Kun,JING Zhefan,WU Yuwei,DENG Yufeng.Latest survey and study of surface flow features of the Qiyi Glacierin the Qilian Mountains[J].Journal of Glaciology and Geocryology,2014,36(3):537-545. |
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| Authors: | WANG Kun JING Zhefan WU Yuwei DENG Yufeng |
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| Institution: | 1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In order to monitor the flow features of the Qiyi Glacier and further reveal the variation of mountain glaciers, the positions of posts on the surface of the Qiyi Glacier were surveyed and the latest observation data (the positions of posts, the mass balance of the glacier, the border of glacier's terminus) were obtained by using hand-held GPS receiver from July to August of 2012 and from August to September of 2013. Through analyzing these data with the help of GIS software, the surface flow features and the terminus variation of the glacier were obtained. In terms of spatial distribution, the flow features of the glacier maintains a general regulation of the mountain glaciers in cross section and longitudinal section. In the cross section, velocities nearby the mainstream line are larger than those in both sides of the glacier；along a longitudinal section, velocity increases from the terminus to the equilibrium line altitude. In terms of the flow direction, the velocity vector of the glacier mostly points downwards along the mainstream line or slightly off the line in a certain direction. Temporally, the surface flow velocity varies with season. In detail, the velocity in the ablation season is significantly higher. The overall velocity of the Qiyi Glacier is showing a decreasing trend in recent decades. The terminus is significantly retreating, for example, it retreated about 5-7 m from August 2012 to August 2013. |
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| Keywords: | Qiyi Glacier surface flow GPS features |
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