The Pacific-Atlantic seesaw and the Bering Strait
The Pacific-Atlantic seesaw and the Bering Strait
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DOI：
10.1029/2011gl050567
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发表时间：
2012-02-03
影响因子：
5.2
通讯作者：
Chikamoto, Megume O.
中科院分区：
文献类型：
--
作者：
Hu, Aixue;Meehl, Gerald A.;Chikamoto, Megume O.
古代用资料和以往的模拟研究都表明，北大西洋冰山的大量排放可能导致大西洋纬向翻转环流（AMOC）（几乎）崩溃，导致北太平洋和北大西洋之间的气候变化呈跷跷板式，前者变暖，后者变冷。在这里，通过使用一个完全耦合的气候模式，我们表明，这种太平洋-大西洋跷跷板与AMOC的变化只能发生时，白令海峡是关闭的。由于这个海峡被关闭，北太平洋和大西洋之间的海洋联系被切断。当AMOC崩溃时，北大西洋变得更冷，但由于太平洋经向翻转环流的建立，北太平洋变得更暖，将更多温暖和咸的亚热带水输送到北太平洋，导致两个海洋盆地出现跷跷板式的气候变化。引文：Hu，A.，G. A. Meehl，W. Han，A. Abe-Ouchi角莫里尔，Y. Okazaki和M. O. Chikamoto（2012），The Pacific-Atlantic Seesaw and the Bering Strait，Geophys.保留信函：39，L03702，doi：10.1029/2011GL050567。
Paleo proxy data and previous modeling studies both indicate that the massive discharge of icebergs into the North Atlantic may have led to a (nearly) collapsed Atlantic meridional overturning circulation (AMOC), resulting in a seesaw-like climate change between the North Pacific and North Atlantic, with a warming in the former and a cooling in the latter. Here by using a fully coupled climate model, we show that this Pacific-Atlantic seesaw associated with changes of the AMOC can only occur when the Bering Strait is closed. As this strait is closed, the oceanic communication between the North Pacific and Atlantic is cut off. When AMOC collapses, the North Atlantic becomes cooler, but the North Pacific becomes warmer due to the buildup of the Pacific meridional overturning circulation which transports more warm and salty subtropical water into the North Pacific, leading to seesaw-like climate changes in the two ocean basins. Citation: Hu, A., G. A. Meehl, W. Han, A. Abe-Ouchi, C. Morrill, Y. Okazaki, and M. O. Chikamoto (2012), The Pacific-Atlantic seesaw and the Bering Strait, Geophys. Res. Lett., 39, L03702, doi: 10.1029/2011GL050567.