Evaluating the variability of glacial lakes in the Kyrgyz and Teskey ranges, Tien Shan
Evaluating the variability of glacial lakes in the Kyrgyz and Teskey ranges, Tien Shan
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DOI：
10.3389/feart.2022.850146
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
M. Daiyrov;D. B. Kattel;C. Narama;Weicai Wang
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文献类型：
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作者：
M. Daiyrov;D. B. Kattel;C. Narama;Weicai Wang
由于频繁的冰川湖暴发洪水(GLOF)，天山北部是吉尔吉斯斯坦最危险的地区之一。近年来，该地区冰川湖泊的现状尚未见报道。因此，这项研究利用Sentinel-2和PlanetScope光学卫星图像调查了2017年至2019年吉尔吉斯山脉和特斯基山脉冰川湖泊的变化。结果证实有800个冰川湖泊，其中351个位于吉尔吉斯山脉，449个位于特斯基山脉。我们发现冰川湖泊的特征具有季节性，在我们的观察期内，大多数冰川湖泊被发现是不稳定的。242个冰川湖泊在面积上表现出显著的差异。我们发现了46个新出现的冰川湖泊，其中5个在形成后的一年里迅速扩张，而18个被发现已经消失。13个湖泊被发现是短暂或不稳定的。在本研究中，14个湖泊的面积呈显著扩大的趋势。冰川湖泊的如此大的变化与当地的地貌条件、当地的气候和冰川融化密切相关。我们还发现，海拔3500米以上的冰川湖泊的数量发生了显著变化。它与山脉永久冻土带和冰川末端的变化有关。目前的研究建议利用遥感和实地调查对每个季节的冰川湖泊进行详细调查。
The northern Tien Shan Mountains are one of the most hazardous areas in Kyrgyzstan due to frequent glacial lake outburst floods (GLOFs). The current status of glacial lakes in this region has not been reported in recent years. Therefore, this study investigates the variations of glacial lakes in the Kyrgyz and Teskey ranges using Sentinel-2 and PlanetScope optical satellite images from 2017 to 2019. Results confirm that there are 800 glacial lakes, of which 351 were in the Kyrgyz and 449 were in the Teskey Range. We found seasonality in the character of glacial lakes, most of which have been found to be unstable during our observation period. 242 glacial lakes showed significant variations in area. We found 46 newly emerging glacial lakes, five of which have rapidly expanded in the year since they formed, while 18 were found to have vanished. Thirteen lakes were found to be short-lived or unstable. In this study, 14 lakes showed a significant expansion of area. Such large variations in the glacial lakes are closely linked to local geomorphological conditions, local climate and glacier melt. We also identified a significant shift in the number of glacial lakes at altitudes over 3,500 m asl. It is associated with the mountain permafrost zone and variations of the glacier terminus. The current study recommends detailed investigation of glacial lakes in each season with the use of remote sensing and field surveys.