绘制凯尔盖朗群岛(南纬 49 度)库克冰帽东北部冰碛复合体地图并重建冰川动力学

IF 1.8 4区 地球科学 Q3 ENVIRONMENTAL SCIENCES
Philip Deline, Henriette Linge, Ludovic Ravanel, Talin Tuestad, Romain Lafite, Fabien Arnaud, Jostein Bakke
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引用次数: 0

摘要

由于南半球的陆地面积有限,我们必须依靠南大洋中的亚南极岛屿提供的数据来记录历史气候模式。在过去的几十年里,整个南大洋地区的冰川经历了明显的消退,尤其是在凯尔盖朗群岛,那里的冰川地貌为了解长期的气候波动提供了宝贵的资料。我们在其偏远的西北部地区进行了全面的冰川地貌研究,对源自库克冰帽的小型峡谷冰川和大型出口冰川的冰碛复合体进行了细致的研究。我们对这些地貌进行了测绘,以重建全新世的历史冰川范围。与最大冰川面积相比,1962-1964 年三大冰川的表面积仅减少了 35%,而航空和卫星图像显示的 1962 年至 2019 年 12 个时间区间的表面积变化则累计减少了 43.5%。此外,我们还模拟了关键冰川在三个不同阶段的冰川厚度和平衡线高度变化:1)1962 年前的最大范围;2)20 世纪 60 年代初;3)2019 年。这一多方面的分析为了解凯尔盖朗冰川的动态以及对了解南半球过去和现在的气候动态的更广泛影响提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mapping of morainic complexes and reconstruction of glacier dynamics north-east of Cook Ice Cap, Kerguelen Archipelago (49°S)

Due to the limited landmasses in the Southern Hemisphere, we must rely on data from sub-Antarctic islands within the Southern Ocean to record historical climate patterns. Over the past few decades, glaciers throughout the Southern Ocean region have experienced a noticeable retreat, especially in the Kerguelen Archipelago, whose glacial landforms offer valuable insights into long-term climate fluctuations. Our comprehensive glacial geomorphological study conducted in its remote north-western region meticulously examines morainic complexes from smaller cirque glaciers and larger outlet glaciers stemming from the Cook Ice Cap. We mapped these landforms to reconstruct historical glacier extents during the Holocene. The surface area of the three main glaciers had decreased in 1962–1964 by only 35% compared to their maximum extents, whereas surface area changes across 12 time intervals spanning from 1962 to 2019 from aerial and satellite imagery reveal a cumulative reduction of 43.5%. Additionally, we modelled changes in glacier thickness and equilibrium-line altitude for the key glaciers at three distinct stages: 1) their maximum extent before 1962, 2) the early 1960s and 3) 2019. This multifaceted analysis contributes valuable insights into the dynamics of Kerguelen's glaciers and the broader implications for understanding past and ongoing climate dynamics in the Southern Hemisphere.

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来源期刊
Antarctic Science
Antarctic Science 地学-地球科学综合
CiteScore
3.60
自引率
6.20%
发文量
42
审稿时长
3 months
期刊介绍: Antarctic Science provides a truly international forum for the broad spread of studies that increasingly characterise scientific research in the Antarctic. Whilst emphasising interdisciplinary work, the journal publishes papers from environmental management to biodiversity, from volcanoes to icebergs, and from oceanography to the upper atmosphere. No other journal covers such a wide range of Antarctic scientific studies. The journal attracts papers from all countries currently undertaking Antarctic research. It publishes both review and data papers with no limits on length, two-page short notes on technical developments and recent discoveries, and book reviews. These, together with an editorial discussing broader aspects of science, provide a rich and varied mixture of items to interest researchers in all areas of science. There are no page charges, or charges for colour, to authors publishing in the Journal. One issue each year is normally devoted to a specific theme or papers from a major meeting.
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