Past intrusion of Circumpolar Deep Water in the Ross Sea: Impacts on the ancient Ross Ice Shelf

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-06-27

Chiara Pambianco, Alessio Nogarotto, Mathia Sabino, Lucilla Capotondi, Francesca Battaglia, Federico Giglio, Gesine Mollenhauer, Jens Hefter, Alessio Di Roberto, Simon T. Belt, Enrico Pochini, Francesco Muschitiello, Andrea Geniram, Ester Colizza, Giulia Giorgetti, Fiorenza Torricella, Tommaso Tesi

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Abstract

The Ross Ice Shelf, Antarctica’s largest by area, may face increased instability under future warming, threatening the Antarctic Ice Sheet. Understanding its past response to climate change is critical for anticipating future sea-level rise. We present a multi-proxy reconstruction of ocean and cryosphere conditions in the Ross Sea over the past 40,000 years. Our data show that warm Circumpolar Deep Water reached the JOIDES Trough in the western Ross Sea shortly after the Last Glacial Maximum, coinciding with the retreat of an ancestral ice shelf. This oceanic warming aligns with a southward shift of both the westerly and easterly wind belts, indicating a large-scale atmospheric mechanism driving regional ocean changes. The timing and nature of these processes reveal the tight coupling between atmospheric circulation, ocean heat transport, and ice shelf dynamics. These interactions led to reduced ice shelf extent, highlighting the role of ocean-atmosphere coupling in the Pacific sector of the Southern Ocean during deglaciation.

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罗斯海极地深水过去的入侵：对古罗斯冰架的影响

罗斯冰架是南极洲面积最大的冰架，在未来变暖的情况下，它可能面临更大的不稳定性，威胁到南极冰盖。了解它过去对气候变化的反应对于预测未来海平面上升至关重要。我们提出了罗斯海过去4万年的海洋和冰冻圈条件的多代理重建。我们的数据表明，温暖的环极深水在末次盛冰期后不久到达罗斯海西部的JOIDES槽，与祖先冰架的退缩相吻合。这种海洋变暖与西风带和东风带的南移一致，表明了驱动区域海洋变化的大尺度大气机制。这些过程的时间和性质揭示了大气环流、海洋热输送和冰架动力学之间的紧密耦合。这些相互作用导致冰架范围缩小，突出了冰消期南大洋太平洋部分海洋-大气耦合的作用。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.