The ice dynamic and melting response of Pine Island Ice Shelf to calving

IF 2.5 4区地球科学 Q2 GEOGRAPHY, PHYSICAL

Annals of Glaciology Pub Date : 2022-09-01 DOI:10.1017/aog.2023.24

A. T. Bradley, J. De Rydt, D. T. Bett, P. Dutrieux, P. Holland

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引用次数: 2

Abstract

Abstract Sea level rise contributions from the Pine Island Glacier (PIG) are strongly modulated by the backstress that its floating extension – Pine Island Ice Shelf (PIIS) – exerts on the adjoining grounded ice. The front of PIIS has recently retreated significantly via calving, and satellite and theoretical analyses have suggested further retreat is inevitable. As well as inducing an instantaneous increase in ice flow, retreat of the PIIS front may result in increased ocean melting, by relaxing the topographic barrier to warm ocean water that is currently provided by a prominent seabed ridge. Recently published research (Bradley and others, 2022a) has shown that PIIS may exhibit a strong melting response to calving, with melting close to the PIG grounding line always increasing with ice front retreat. Here, we summarise this research and, additionally, place the results in a glaciological context by comparing the impact of melt-induced and ice-dynamical changes in the ice shelf thinning rate. We find that while PIG is expected to experience rapid acceleration in response to further ice front retreat, the mean instantaneous thinning response is set primarily by changes in melting, rather than ice dynamics. Overall, further ice front retreat is expected to lead to enhanced ice-shelf thinning, with potentially detrimental consequences for ice shelf stability.

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松岛冰架对冰裂的动力和融化响应

摘要松岛冰川（PIG）对海平面上升的贡献受到其漂浮延伸部分——松岛冰架（PIIS）——对邻近搁浅冰施加的背压力的强烈调节。PIIS的锋面最近通过崩解显著后退，卫星和理论分析表明，进一步后退是不可避免的。PIIS锋面的后退不仅会导致冰流的瞬间增加，还可能会使地形屏障放松，从而导致海洋融化加剧，而温暖的海水目前是由一个突出的海底山脊提供的。最近发表的研究（Bradley等人，2022a）表明，PIIS可能对冰裂表现出强烈的融化反应，靠近PIG接地线的融化总是随着冰锋的消退而增加。在这里，我们总结了这项研究，此外，通过比较融化引起的变化和冰动力学变化对冰架变薄率的影响，将结果置于冰川学背景下。我们发现，虽然PIG预计会随着冰锋的进一步退缩而快速加速，但平均瞬时变薄响应主要由融化的变化而非冰动力学决定。总的来说，冰锋的进一步退缩预计将导致冰架变薄，对冰架的稳定性产生潜在的不利影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

8.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.