Interactive movements of outlet glacier tongue and landfast sea ice in Lutzow-Holm Bay, East Antarctica, detected by ALOS-2/PALSAR-2 imagery
Interactive movements of outlet glacier tongue and landfast sea ice in Lutzow-Holm Bay, East Antarctica, detected by ALOS-2/PALSAR-2 imagery
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ALOS-2/PALSAR-2 图像检测到南极洲东部卢佐夫-霍尔姆湾出口冰川舌和陆地海冰的交互运动
DOI：
10.1016/j.srs.2022.100064
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发表时间：
2022
影响因子：
--
通讯作者：
Tamura Takeshi
中科院分区：
文献类型：
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作者：
Nakamura Kazuki;Aoki Shigeru;Yamanokuchi Tsutomu;Tamura Takeshi
白濑冰川是南极洲东部流速最快的注出冰川之一，流入通常被固定海冰覆盖的海湾。尽管固定冰的存在被认为可以稳定冰川舌，但定量评估还不够。我们利用 ALOS-2/PALSAR-2 图像的相关方法，研究了 2017 年 4 月陆地冰崩塌前后冰川舌和周围陆地冰流速的时空变化。崩塌后，冰川舌流速加速了 8-15%（0.20-0.38 km a−1）。固陆冰重建后，与冰川末端接触的固陆冰流速为冰川末端流速的20%~90%。冰川冰和海冰运动相互作用变化的估计可以用来量化支撑效应，支撑效应是影响南极出口冰川质量收支的关键因素。
The Shirase Glacier, one of the fastest-flowing outlet glaciers in East Antarctica, flows into a bay that is usually covered by landfast sea ice. Although the presence of landfast ice is considered to stabilize glacier tongue, quantitative assessments are insufficient. We investigated the spatiotemporal variations in the flow velocities of both the glacier tongue and the surrounding landfast ice using a correlation method with ALOS-2/PALSAR-2 images, before and after a landfast-ice collapse in April 2017. After the collapse, the glacier tongue flow accelerated by 8–15% (0.20–0.38 km a−1). After reestablishment of landfast ice, the flow velocity of the landfast ice in contact with the glacier terminus is 20%–90% of the flow velocity of the glacier terminus The estimates of interactive changes in the motions of both glacier ice and sea ice can be used to quantify the buttress effect, which is a key factor affecting the mass budget of Antarctic outlet glaciers.