The Role of a Weakened Atlantic Meridional Overturning Circulation in Modulating Marine Heatwaves in a Warming Climate
The Role of a Weakened Atlantic Meridional Overturning Circulation in Modulating Marine Heatwaves in a Warming Climate
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DOI：
10.1029/2021gl095941
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发表时间：
2021-11
影响因子：
5.2
通讯作者：
Xianglin Ren;Wei Liu
中科院分区：
文献类型：
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作者：
Xianglin Ren;Wei Liu
通过在整个21世纪的气候模式模拟中保持大西洋经向翻转环流(AMOC)的强度，探讨了在人为变暖条件下，大西洋经向翻转环流(AMOC)减速对全球海洋热波(MHW)的影响。在过去的40年里，除北大西洋变暖洞(NAWH)上的MHW外，AMOC的减速对全球MHW的影响并不显著，在NAWH上，减弱的AMOC通过产生更凉爽的平均状态海表面温度，使MHW的发生和持续时间减少了约一半。随着AMOC在本世纪继续减弱，其对北大西洋和太平洋MHW的影响变得显著。减弱的AMOC导致了MHW频率的两极拉锯式变化，MHW在南半球更频繁，而在北半球，除NAWH外，MHW更少。例外的原因是，NAWH地区将进入近乎永久的MHW状态，而不会出现AMOC减速。
We explore the effect of Atlantic meridional overturning circulation (AMOC) slowdown on global marine heatwaves (MHWs) under anthropogenic warming by maintaining AMOC strength in climate model simulations throughout the 21st century. The AMOC slowdown has an insignificant effect on global MHWs during the past four decades, except those over the North Atlantic warming hole (NAWH) where the weakened AMOC reduces the occurrence and duration of MHWs by about half by creating a cooler mean‐state sea surface temperature. As the AMOC continues weakening in current century, its effect becomes significant on MHWs in the North Atlantic and Pacific Oceans. The weakened AMOC induces a bipolar‐seesaw‐like change in MHW frequencies, with more frequent MHWs in the Southern Hemisphere but less frequent MHWs in the North Hemisphere except over the NAWH. The reason for the exception is that the NAWH region would enter a near‐permanent MHW state without an AMOC slowdown.