Deconstructing the Last Glacial termination: the role of millennial and orbital-scale forcings
Deconstructing the Last Glacial termination: the role of millennial and orbital-scale forcings
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DOI：
10.1016/j.quascirev.2011.02.005
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发表时间：
2011-05-01
影响因子：
4
通讯作者：
Mouchet, A.
中科院分区：
文献类型：
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作者：
Menviel, L.;Timmermann, A.;Mouchet, A.
利用连续变化的边界条件和假设的淡水强迫剖面强迫的中等复杂地球系统模型，该模型模拟了Heinrich事件1 （HI）、Bolling暖期、老仙女木期、南极冷逆转期（ACR）和新仙女木期，与全球不同地区的古代用数据密切一致。ACR可以模拟为在H1终止期间对AMOC恢复的双极跷跷板响应。然而，这项研究还表明，南极冰盖的快速消融可以进一步放大ACR的幅度。我们认为，劳伦泰德冰盖和南极冰盖的融化导致了与融水脉冲1-A （MWP-1A）相关的海平面上升。假设MWP-1A的北半球源导致了北半球的古仙女木期降温，而南半球源则促成了ACR。该研究还证明，对于本文考虑的大多数古气候代用物，相对时间可以通过瞬态模拟实验定性地再现。本文提出的气候模式解决方案可提供一种手段，进一步限制末次冰期终止期间某些古气候代用物的定年不确定性。(C) 2011 Elsevier Ltd.版权所有。
Using an Earth system model of intermediate complexity forced by continuously varying boundary conditions and a hypothetical profile of freshwater forcing, the model simulates Heinrich event 1 (HI), the Bolling warm period, the Older Dryas, the Antarctic Cold Reversal (ACR) and the Younger Dryas in close agreement with paleo-proxy data from different regions worldwide. The ACR can be simulated as the bipolar seesaw response to the AMOC recovery during the termination of H1. However, this study also demonstrates that the amplitude of the ACR can be further amplified by a rapid deglacial retreat of the Antarctic Ice sheets. We suggest that melting from both, the Laurentide and the Antarctic Ice sheets contributed to the sea level rise associated with Meltwater Pulse 1-A (MWP-1A). It is hypothesized that the northern hemispheric source of MWP-1A caused the Older Dryas cooling in the Northern Hemisphere, whereas the Southern Hemispheric source contributed to the ACR. The study also documents that for the majority of paleo-climate proxies considered here, the relative timing can be qualitatively reproduced by the transient modeling experiments. The climate model solution presented here may provide a means to further constrain dating uncertainties of some of paleo-climate proxies during the Last Glacial Termination. (C) 2011 Elsevier Ltd. All rights reserved.