格陵兰冰盖的退缩导致其淡水和潮水边缘出现不同的重组模式

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Journal of Glaciology Pub Date : 2024-09-16 DOI:10.1017/jog.2024.61
Jonathan Ryan, Theo Ross, Sarah Cooley, Dominik Fahrner, Nicole Abib, Victoria Benson, David Sutherland
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引用次数: 0

摘要

由于气候变暖,格陵兰的海洋和陆地末端冰川正在向内陆后退,从而重新配置了冰原与其冰期环境的互动方式。在这里,我们利用三十年的卫星图像来确定冰原边缘暴露于海洋和湖泊过程的程度是增加了还是减少了。在 1990-2019 年的研究期间,我们发现,由于海洋末端冰川退缩到更狭窄的峡湾,与海洋接触的冰原周缘长度缩小了 12.3 ± 3.8%(196.2 ± 10.4 公里)。另一方面,我们发现与淡水湖接触的冰盖周长呈现出更多不同的趋势,这在区域尺度上得到了更好的探讨。格陵兰西南部、北部和西北部的冰湖边界长度有所增加,而东南部和中东部则有所减少。我们在研究期间记录到的变化幅度使我们得出结论,冰盖将在未来几十年内进一步大幅重组,从而对格陵兰陆地和海洋环境中的淡水、营养物质和初级生产力的流动产生影响。
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Retreat of the Greenland Ice Sheet leads to divergent patterns of reconfiguration at its freshwater and tidewater margins

Greenland's marine- and land-terminating glaciers are retreating inland due to climate warming, reconfiguring the way the ice sheet interacts with its proglacial environment. Here we use three decades of satellite imagery to determine whether the ice-sheet margin is becoming more or less exposed to marine and lacustrine processes. During our 1990–2019 study period, we find that the length of ice-sheet perimeter in contact with the ocean shrank by 12.3 ± 3.8% (196.2 ± 10.4 km), due to the retreat of marine-terminating glaciers into narrower fjords. On the other hand, we find that the length of the ice-sheet perimeter in contact with freshwater lakes exhibited more divergent trends that is better explored at regional scales. The length of ice–lake boundaries increased in southwest, north and northwest Greenland but declined in southeast and central east Greenland. The magnitude of change we document during our study period leads us to conclude that the ice sheet is poised for further, substantial reconfiguration in the coming decades with consequences for the flux of fresh water, nutrients and primary productivity in Greenland's terrestrial and oceanic environment.

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来源期刊
Journal of Glaciology
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.
期刊最新文献
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