Calving, ice flow, and thickness of outlet glaciers controlled by land-fast sea ice in Lützow-Holm Bay, East Antarctica

IF 2.8 3区地球科学 Q2 GEOGRAPHY, PHYSICAL Journal of Glaciology Pub Date : 2023-08-14 DOI:10.1017/jog.2023.59

Ken Kondo, S. Sugiyama

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Abstract

To investigate the mechanisms driving recent changes in outlet glaciers in Antarctica, we measured the glacier front position, flow velocity and surface elevation of five outlet glaciers flowing into Lützow-Holm Bay in East Antarctica. After a steady advance from 2008 to 2015, all the glaciers synchronously retreated by 0.4–6.0 km between 2016 and 2018. The initiation of the retreat coincided with the breakup of land-fast sea ice in Lützow-Holm Bay in 2016, which resulted in the largest sea-ice loss in the region since 1998. Similar flow variations and surface elevation changes were observed near the grounding line of Shirase, Skallen and Telen glaciers. The slowdown in 2011–15 (by 13%) and the speedup in 2016–18 (by 7%) coincided with the respective increase and decrease in surface elevation. Simultaneous retreat and acceleration after the land-fast sea-ice breakup implies that sea ice has a significant influence on glacier dynamics. Thickening/thinning observed near the grounding line was attributed to a reduced/enhanced stretching flow regime during the deceleration/acceleration period. Our results demonstrate that land-fast sea ice affects not only terminus positions, but also the flow speed and ice thickness of the Antarctic glaciers.

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南极洲东部吕措-霍尔姆湾陆地快速海冰控制的出口冰川的崩解、冰流和厚度

为了探讨南极出口冰川近期变化的驱动机制，我们测量了流入南极洲东部l zow- holm湾的5个出口冰川的冰川前沿位置、流速和地表高程。经过2008年至2015年的稳步推进，所有冰川在2016年至2018年期间同步后退0.4-6.0公里。2016年，l佐-霍尔姆湾陆上海冰破裂，导致该地区自1998年以来最大的海冰损失。Shirase、Skallen和Telen冰川接地线附近也有类似的流量变化和地表高程变化。2011-15年的放缓(13%)和2016-18年的加速(7%)与地表高度的上升和下降相吻合。海冰在陆速崩解后同时后退和加速，表明海冰对冰川动力学有显著影响。在接地线附近观察到的增厚/变薄归因于减速/加速期间拉伸流态的减少/增强。研究结果表明，陆阻海冰不仅影响南极冰川的末端位置，还影响南极冰川的流速和冰厚。

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来源期刊

Journal of Glaciology 地学-地球科学综合

CiteScore

5.80

自引率

14.70%

发文量

101

审稿时长

6 months

期刊介绍： Journal of Glaciology publishes original scientific articles and letters in any aspect of glaciology- the study of ice. Studies of natural, artificial, and extraterrestrial ice and snow, as well as interactions between ice, snow and the atmospheric, oceanic and subglacial environment are all eligible. They may be based on field work, remote sensing, laboratory investigations, theoretical analysis or numerical modelling, or may report on newly developed glaciological instruments. Subjects covered recently in the Journal have included palaeoclimatology and the chemistry of the atmosphere as revealed in ice cores; theoretical and applied physics and chemistry of ice; the dynamics of glaciers and ice sheets, and changes in their extent and mass under climatic forcing; glacier energy balances at all scales; glacial landforms, and glaciers as geomorphic agents; snow science in all its aspects; ice as a host for surface and subglacial ecosystems; sea ice, icebergs and lake ice; and avalanche dynamics and other glacial hazards to human activity. Studies of permafrost and of ice in the Earth’s atmosphere are also within the domain of the Journal, as are interdisciplinary applications to engineering, biological, and social sciences, and studies in the history of glaciology.