Mid-pliocene Atlantic Meridional Overturning Circulation not unlike modern
Mid-pliocene Atlantic Meridional Overturning Circulation not unlike modern
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DOI：
10.5194/cp-9-1495-2013
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发表时间：
2013-07
影响因子：
4.3
通讯作者：
Z.S. Zhang;K. Nisancioglu;M. Chandler;A. Haywood;B. Otto‐Bliesner;G. Ramstein;C. Stepanek;A. Abe‐Ouc
中科院分区：
文献类型：
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作者：
Z.S. Zhang;K. Nisancioglu;M. Chandler;A. Haywood;B. Otto‐Bliesner;G. Ramstein;C. Stepanek;A. Abe‐Ouc
抽象的。在上新世模式比较项目（PlioMIP）中，8个最先进的耦合气候模式模拟了上新世中期温暖期（mPWP，3.264至3.025 Ma）。在这里，我们比较了大西洋经向翻转环流（AMOC），北向海洋热输送和海洋分层与这些模式模拟。参与PlioMIP的模型没有一个像早期代理研究所建议的那样模拟了一个强大的上新世中期AMOC。相反，在PlioMIP模型中，AMOC最大值没有一致的增加。AMOC唯一一致的变化是大西洋翻转单元变浅，以及盆地深处北大西洋深水（NADW）的影响减少。此外，模拟的上新世中期大西洋向北的热量输送是类似的工业化前。这些模拟结果表明，重建的高纬度上新世中期变暖不能解释为一个直接的响应，以加强AMOC和随之而来的增加向北的海洋热量输送的大西洋。
Abstract. In the Pliocene Model Intercomparison Project (PlioMIP), eight state-of-the-art coupled climate models have simulated the mid-Pliocene warm period (mPWP, 3.264 to 3.025 Ma). Here, we compare the Atlantic Meridional Overturning Circulation (AMOC), northward ocean heat transport and ocean stratification simulated with these models. None of the models participating in PlioMIP simulates a strong mid-Pliocene AMOC as suggested by earlier proxy studies. Rather, there is no consistent increase in AMOC maximum among the PlioMIP models. The only consistent change in AMOC is a shoaling of the overturning cell in the Atlantic, and a reduced influence of North Atlantic Deep Water (NADW) at depth in the basin. Furthermore, the simulated mid-Pliocene Atlantic northward heat transport is similar to the pre-industrial. These simulations demonstrate that the reconstructed high-latitude mid-Pliocene warming can not be explained as a direct response to an intensification of AMOC and concomitant increase in northward ocean heat transport by the Atlantic.