Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperatures During the Last Deglaciation

N. E. Umling; D. W. Oppo; P. Chen; J. Yu; Z. Liu; M. Yan; G. Gebbie; D. C. Lund; K. R. Pietro; Z. D. Jin; K.-F. Huang; K. B. Costa; F. A. L. Toledo

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Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperatures During the Last Deglaciation

机译：在最后的解放期间，大西洋循环和冰板对南大西洋温度的影响

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Atlantic Meridional Overturning Circulation (AMOC) disruption during the last deglaciation is hypothesized to have caused large subsurface ocean temperature anomalies, but records from key regions are not available to test this hypothesis, and other possible drivers of warming have not been fully considered. Here, we present the first reliable evidence for subsurface warming in the South Atlantic during Heinrich Stadial 1, confirming the link between large-scale heat redistribution and AMOC. Warming extends across the B?lling-Aller?d despite predicted cooling at this time, thus spanning intervals of both weak and strong AMOC indicating another forcing mechanism that may have been previously overlooked. Transient model simulations and quasi-conservative water mass tracers suggest that reduced northward upper ocean heat transport was responsible for the early deglacial (Heinrich Stadial 1) accumulation of heat at our shallower (~1,100 m) site. In contrast, the results suggest that warming at our deeper site (~1,900 m) site was dominated by southward advection of North Atlantic middepth heat anomalies. During the B?lling-Aller?d, the demise of ice sheets resulted in oceanographic changes in the North Atlantic that reduced convective heat loss to the atmosphere, causing subsurface warming that overwhelmed the cooling expected from an AMOC reinvigoration. The data and simulations suggest that rising atmospheric CO_2 did not contribute significantly to deglacial subsurface warming at our sites.

机译：据推测，上一次冰消期间大西洋经向翻转环流（AMOC）的中断导致了大量的地下海洋温度异常，但关键区域的记录无法验证这一假设，其他可能的变暖驱动因素也没有得到充分考虑。在这里，我们提出了海因里希·斯塔迪亚尔1号期间南大西洋地下变暖的第一个可靠证据，证实了大规模热量再分配与AMOC之间的联系。全球变暖蔓延到B？阿勒？d尽管预测此时会冷却，因此跨越了弱AMOC和强AMOC的间隔，这表明了另一种以前可能被忽略的强迫机制。瞬态模型模拟和准保守水团示踪剂表明，向北的上层海洋热输送减少是我们较浅（~1100 m）地点早期冰期（海因里希·斯塔迪亚尔1号）热量积累的原因。相比之下，结果表明，在我们较深的位置（~1900米）的变暖主要是北大西洋中深热异常向南平流造成的。在B期间？阿勒？d、冰盖的消亡导致北大西洋的海洋学变化，减少了对大气的对流热损失，导致地下变暖，超过了AMOC恢复活力所预期的冷却。数据和模拟表明，大气CO2的上升并没有对我们研究地点的冰消次表层变暖做出显著贡献。

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来源
《Paleoceanography》 |2019年第6期|共16页
作者
N. E. Umling; D. W. Oppo; P. Chen; J. Yu; Z. Liu; M. Yan; G. Gebbie; D. C. Lund; K. R. Pietro; Z. D. Jin; K.-F. Huang; K. B. Costa; F. A. L. Toledo;
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作者单位

Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

Research School of Earth Sciences The Australian National University Canberra Australia;

Research School of Earth Sciences The Australian National University Canberra Australia;

Department of Geography Ohio State University Columbus OH USA;

Key Laboratory of Virtual Geographic Environment Ministry of Education State Key Laboratory of Geographical Environment Evolution Jiangsu Provincial Cultivation Base;

School of Geography Science Nanjing Normal University Nanjing China;

Department of Physical Oceanography Woods Hole Oceanographic Institution Woods Hole MA USA;

Department of Marine Sciences University of Connecticut Storrs CT USA;

Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China;

Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

Oceanographic Institute University of S?o Paulo S?o Paulo Brazil;

Oceanographic Institute University of S?o Paulo S?o Paulo Brazil;

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正文语种 eng
中图分类海洋学;
关键词
Atlantic Circulation; Sheet Influences; Upper South;

机译：大西洋循环;片材影响;上南;

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Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperatures During the Last Deglaciation

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