首页|青藏高原念青唐古拉山廓琼岗日1号冰川变化研究

青藏高原念青唐古拉山廓琼岗日1号冰川变化研究

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小冰川对气候变化非常敏感,监测与定量评估此类冰川变化有助于理解冰川对气候变化的响应幅度与机制.本研究结合多源遥感数据(卫星遥感与无人机航测),分析了近50年来青藏高原念青唐古拉山廓琼岗日1号冰川面积变化趋势,定量评估了该冰川近期的冰面高程变化幅度与空间分布.结果表明,1968-2021年廓琼岗日小型冰斗冰川的面积从(1.444±0.013)km2缩减至(0.712±0.001)km2,萎缩幅度达到50.7%,冰川末端退缩平均速率约为(6.23±0.71)m·a-1.基于2020-2021年高精度无人机航测数据发现,廓琼岗日1号冰川冰面平均高程差达到(-2.41±0.69)m,冰川末端高程变化大于3 m,中部的冰面高程下降幅度在1.5～3 m之间.研究还发现冰川表面河道对冰面高程空间变化起着重要作用,该冰川表面共发育有13条表面河道,2020-2021年河道向西北方向偏移约2 m.冰面河道的向下侵蚀与侧向消融导致末端冰面高程变化呈现显著的空间差异.
Changes of Kuoqionggangri No.1 Glacier in the Nyainqêntanglha Mountains,Qinghai-Tibet Plateau
Small glaciers are very sensitive to climate change,and monitoring and quantitative assessment of this type of glacier changes can help to understand the magnitude and mechanism of glacier response to climate change.In this study,we combined multi-source remote sensing data(satellite and UAV data)and meteorologi-cal data to analyze the change in area of Kuoqionggangri No.1 Glacier in the Nyainqêntanglha Mountains,Qing-hai-Tibet(Xizang)Plateau over the past 50 years,and quantitatively evaluated the magnitude of recent elevation changes and the spatial distribution of Kuoqionggangri No.1 Glacier.The study shows that the area of Kuoq-ionggangri small cirque glacier shrank from(1.444±0.013)km2 to(0.712±0.001)km2 during 1968-2021,with a shrinkage of 50.7%,and the average rate of glacier terminus retreat was(6.23±0.71)m·a-1.Based on the high-precision UAV survey data from 2020 to 2021,we found that the average elevation difference of the ice surface of Kuoqionggangri No.1 Glacier reached(-2.41±0.69)m·a-1.The average ice surface elevation change at the glacier terminus was greater than 3 m,and a decrease in the central part of the glacier in the range of 1.5 to 3 m.The study also found that glacier supraglacial streams play an important role in the spatial variation of el-evation.There are 13 supraglacial streams developed on the surface of this glacier,and the average offset of the streams to the northwest from 2020 to 2021 is about 2 m.Downward and lateral erosion of the supraglacial streams resulted in causing significant spatial differences ice elevation changes at the glacier terminate.

remote sensingUAVNyainqêntanglha MountainsKuoqionggangri No.1 Glacierice surface elevation changesupraglacial streams

张天诏、杨威、赵传熙、王忠彦、何震、王永杰、邬光剑、李久乐、安宝晟

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中国科学院 青藏高原研究所 青藏高原地球系统与资源环境全国重点实验室,北京 100101

中国科学院大学,北京 100049

兰州大学 资源环境学院,甘肃 兰州 730000

西藏大学 理学院,西藏 拉萨 850011

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遥感 无人机 念青唐古拉山 廓琼岗日1号冰川 冰面高程变化 冰面河道

第二次青藏高原综合科学考察研究项目国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目西藏自治区科技计划项目西藏自治区科技计划项目西藏自治区科技计划项目拉萨河流域生态环境保护修复治理地球系统科考示范平台

2019QZKK0201419611340354227113842271312XZ202301ZY0028GXZ202301ZY0022GXZ202101ZD0014G

2024

10.7522/j.issn.1000-0240.2024.0032

冰川冻土
中国地理学会 中国科学院寒区旱区环境与工程研究所

冰川冻土

CSTPCD
影响因子：2.546
ISSN：1000-0240
年,卷(期)：2024.46(2)
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