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Ryan North^1,2, Timothy T Barrows³

¹School of Earth, Atmospheric and Life Sciences, Environmental Futures Research Centre, University of Wollongong, Wollongong, NSW, 2522, Australia. rnorth.academic@gmail.com.

Scientific reports

|July 8, 2024

概括

档案的航空图像显示,南极冰川在2002年之前是稳定的. 在拉森B冰架崩塌后,这些冰川由于动态变化而损失了35.3Gt的冰,这突显了南极研究历史图像的价值.

科学领域:

冰川学的冰川学
气候科学气候科学
遥感遥感遥感遥感

背景情况:

加快的气候变暖影响南极半岛的冰架和冰川.
准确的长期冰损失记录对于冰川质量平衡估计至关重要.

研究的目的:

用历史空中图像重建拉森B地区的冰川几何形状.
为了确定关键南极冰川在冰架崩前后的海拔变化.

主要方法:

在1968年的航空图像上利用了结构-从-运动摄影仪.
创建了五个冰川的高分辨率 (3.2米) 数字海拔模型.
将历史几何形状与最近的数据进行比较,以量化冰的损失.

主要成果:

拉森B冰架的五个支流冰川在1968年至2001年期间显示出稳定性.
在1968年至2021年期间,由于冰架移除后的动态变化,出现了35.3 ± 1.2 Gt的显著冰损失.
历史上的空中图像证明在冰川几十年前观察冰川几何结构至关重要,这是主要的动态变化.

结论:

拉森B冰架的附属冰川在2002年崩之前是稳定的.
冰架的移除引发了这些冰川的大量动态冰损失.
档案的空中图像是对了解南极冰川长期行为的未充分利用但至关重要的资源.

关键词:

在南极洲,南极洲是南极洲.这就是为什么DEMEM.冰架的崩塌导致了冰架的崩塌.这是一种摄影计量技术 (photogrammetry).海平面上升的海平面上升.

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