Pambianco Chiara, Nogarotto Alessio, Sabino Mathia, Capotondi Lucilla, Battaglia Francesca, Giglio Federico, Mollenhauer Gesine, Hefter Jens, Di Roberto Alessio, Belt Simon T, Pochini Enrico, Muschitiello Francesco, Geniram Andrea, Colizza Ester, Giorgetti Giulia, Torricella Fiorenza, Tesi Tommaso
University Ca' Foscari of Venezia, 30170 Venezia Mestre, Italy.
CNR-National Research Council of Italy, ISP-Institute of Polar Sciences, 40129 Bologna, Italy.
Sci Adv. 2025 Jun 27;11(26):eadt7075. doi: 10.1126/sciadv.adt7075.
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.
罗斯冰架是南极洲面积最大的冰架，在未来气候变暖的情况下可能会面临更大的不稳定性，这对南极冰盖构成了威胁。了解其过去对气候变化的响应对于预测未来海平面上升至关重要。我们展示了过去4万年罗斯海海洋和冰冻圈状况的多指标重建结果。我们的数据表明，末次盛冰期过后不久，温暖的环极深层水抵达了罗斯海西部的乔迪斯海槽，这与一个原始冰架的退缩同时发生。这种海洋变暖与西风带和东风带的南移相一致，表明一种驱动区域海洋变化的大规模大气机制。这些过程的时间和性质揭示了大气环流、海洋热量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，突出了海洋-大气耦合在南大洋太平洋扇区冰消期的作用。
