全新世晚期阿蒙森海堤的可逆冰盖变薄

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-04-28 DOI:10.5194/tc-17-1787-2023
G. Balco, N. Brown, K. Nichols, R. Venturelli, Jonathan Adams, S. Braddock, S. Campbell, B. Goehring, Joanne S. Johnson, D. Rood, K. Wilcken, B. Hall, J. Woodward
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引用次数: 2

摘要

摘要冰下基岩岩芯中的宇宙成因核素浓度表明,位于斯维特冰川和波普冰川之间的南极西部冰盖(WAIS)至少为35 m比过去几千年的现在更薄,然后变厚。这一点很重要,因为人们担心,目前阿蒙森海堤中这些冰川和附近冰川的变薄和接地线退缩可能会不可逆转地导致WAIS的大部分冰川消融,在几十年到几个世纪内,海平面将以分米到米的比例上升。过去发生在类似但不完全相同的气候中的冰盖变薄事件并非不可逆转。我们认为,过去的变薄-增厚周期是由于冰川均衡反弹反馈,类似于被称为当前接地线后退的可能稳定机制,其中全新世早期变薄引起的均衡抬升导致相对海平面下降,有利于接地线前进。
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Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene
Abstract. Cosmogenic-nuclide concentrations in subglacial bedrock cores show that the West Antarctic Ice Sheet (WAIS) at a site between Thwaites and Pope glaciers was at least 35 m thinner than present in the past several thousand years and then subsequently thickened. This is important because of concern that present thinning and grounding line retreat at these and nearby glaciers in the Amundsen Sea Embayment may irreversibly lead to deglaciation of significant portions of the WAIS, with decimeter- to meter-scale sea level rise within decades to centuries. A past episode of ice sheet thinning that took place in a similar, although not identical, climate was not irreversible. We propose that the past thinning–thickening cycle was due to a glacioisostatic rebound feedback, similar to that invoked as a possible stabilizing mechanism for current grounding line retreat, in which isostatic uplift caused by Early Holocene thinning led to relative sea level fall favoring grounding line advance.
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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
Greenland and Canadian Arctic ice temperature profiles database The stability of present-day Antarctic grounding lines – Part 2: Onset of irreversible retreat of Amundsen Sea glaciers under current climate on centennial timescales cannot be excluded The stability of present-day Antarctic grounding lines – Part 1: No indication of marine ice sheet instability in the current geometry Phase-field models of floe fracture in sea ice Relevance of warm air intrusions for Arctic satellite sea ice concentration time series
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