Unveiling spatial variability within the Dotson Melt Channel through high-resolution basal melt rates from the Reference Elevation Model of Antarctica

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-09-05 DOI:10.5194/tc-17-3785-2023
A. Zinck, Bert Wouters, E. Lambert, S. Lhermitte
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Abstract

Abstract. The intrusion of Circumpolar Deep Water in the Amundsen and Bellingshausen Sea embayments of Antarctica causes ice shelves in the region to melt from below, potentially putting their stability at risk. Earlier studies have shown how digital elevation models can be used to obtain ice shelf basal melt rates at a high spatial resolution. However, there has been limited availability of high-resolution elevation data, a gap the Reference Elevation Model of Antarctica (REMA) has filled. In this study we use a novel combination of REMA and CryoSat-2 elevation data to obtain high-resolution basal melt rates of the Dotson Ice Shelf in a Lagrangian framework, at a 50 m spatial posting on a 3-yearly temporal resolution. We present a novel method: Basal melt rates Using REMA and Google Earth Engine (BURGEE). The high resolution of BURGEE is supported through a sensitivity study of the Lagrangian displacement. The high-resolution basal melt rates show a good agreement with an earlier basal melt product based on CryoSat-2. Both products show a wide melt channel extending from the grounding line to the ice front, but our high-resolution product indicates that the pathway and spatial variability of this channel is influenced by a pinning point on the ice shelf. This result emphasizes the importance of high-resolution basal melt rates to expand our understanding of channel formation and melt patterns. BURGEE can be expanded to a pan-Antarctic study of high-resolution basal melt rates. This will provide a better picture of the (in)stability of Antarctic ice shelves.
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通过南极参考高程模型的高分辨率基底融化速率揭示多森融化通道内的空间变动性
摘要南极阿蒙森海和别林斯豪森海的环极深水入侵导致该地区的冰架从下方融化,可能危及其稳定性。早期的研究表明,如何使用数字高程模型以高空间分辨率获得冰架基底融化速率。然而,高分辨率高程数据的可用性有限,南极洲参考高程模型填补了这一空白。在这项研究中,我们使用REMA和CryoSat-2高程数据的新组合,在拉格朗日框架下获得多森冰架的高分辨率基础融化速率 m空间发布,时间分辨率为3年。我们提出了一种新的方法:使用REMA和谷歌地球引擎(BURGEE)的基础熔体速率。通过拉格朗日位移的灵敏度研究,支持了BURGEE的高分辨率。高分辨率的基础熔体速率与基于CryoSat-2的早期基础熔体产物显示出良好的一致性。这两种产品都显示了从接地线延伸到冰锋的宽融化通道,但我们的高分辨率产品表明,该通道的路径和空间变化受到冰架上钉扎点的影响。这一结果强调了高分辨率基础熔体速率的重要性,以扩大我们对通道形成和熔体模式的理解。BURGEE可以扩展到对高分辨率基底融化速率的泛南极研究。这将更好地反映南极冰架的稳定性。
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来源期刊
Cryosphere
Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.70
自引率
17.30%
发文量
240
审稿时长
4-8 weeks
期刊介绍: The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.
期刊最新文献
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