裂缝能改变冰架下的海洋动力学吗?

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Cryosphere Pub Date : 2023-06-07 DOI:10.5194/tc-17-2261-2023
M. Poinelli, M. Schodlok, E. Larour, M. Vizcaíno, R. Riva
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引用次数: 1

摘要

摘要从南极大陆流入海洋的陆冰受到冰架的限制,冰架是支撑冰川流出的浮冰的延伸部分。这些冰架的持续变薄——主要是由于其底部因全球变暖而加速融化——已知会加速冰川融水向世界海洋的释放,从而提高全球海平面。因此,冰基下海洋热侵入的机制对于预测南极冰架的未来至关重要。此外,在南极洲周围到处可见的千米宽的全厚冰裂谷的存在削弱了冰架。然而,它们对冰架周围和冰架下方海洋环流的影响在很大程度上尚未被探索,因为海洋模型的通常特点是分辨率太粗,无法解决它们的存在。在这里,我们应用麻省理工学院的高分辨率环流模型,研究了冰架下海洋动力学和冰架融化对冰锋附近一公里宽裂谷存在的敏感性。我们发现(a)裂谷减少了冰架底部的水和热侵入,(b)在相同的强迫下,裂谷冰架的基底融化平均比完整冰架低20%。值得注意的是,我们计算出在裂谷冰架接地线附近,融化速率显著降低了30%。因此,我们假设裂缝及其对亚冰架动力学的影响是重要的考虑因素,以便准确地再现和预测热侵入冰架腔的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Can rifts alter ocean dynamics beneath ice shelves?
Abstract. Land ice discharge from the Antarctic continent into the ocean is restrained by ice shelves, floating extensions of grounded ice that buttress the glacier outflow. The ongoing thinning of these ice shelves – largely due to enhanced melting at their base in response to global warming – is known to accelerate the release of glacier meltwater into the world oceans, augmenting global sea level. Mechanisms of ocean heat intrusion under the ice base are therefore crucial to project the future of Antarctic ice shelves. Furthermore, ice shelves are weakened by the presence of kilometer-wide full-thickness ice rifts, which are observed all around Antarctica. However, their impact on ocean circulation around and below ice shelves has been largely unexplored as ocean models are commonly characterized by resolutions that are too coarse to resolve their presence. Here, we apply the Massachusetts Institute of Technology general circulation model at high resolution to investigate the sensitivity of sub-shelf ocean dynamics and ice-shelf melting to the presence of a kilometer-wide rift in proximity of the ice front. We find that (a) the rift curtails water and heat intrusion beneath the ice-shelf base and (b) the basal melting of a rifted ice shelf is on average 20 % lower than for an intact ice shelf under identical forcing. Notably, we calculate a significant reduction in melting rates of up to 30 % near the grounding line of a rifted ice shelf. We therefore posit that rifts and their impact on the sub-shelf dynamics are important to consider in order to accurately reproduce and project pathways of heat intrusion into the ice-shelf cavity.
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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.
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