While the Atlantic Meridional Overturning Circulation (AMOC) is projected to slow down under anthropogenic warming, the exact role of the AMOC in future climate change has not been fully quantified. Here, we present a method to stabilize the AMOC intensity in anthropogenic warming experiments by removing fresh water from the subpolar North Atlantic. This method enables us to isolate the AMOC climatic impacts in experiments with a full-physics climate model. Our results show that a weakened AMOC can explain ocean cooling south of Greenland that resembles the North Atlantic warming hole and a reduced Arctic sea ice loss in all seasons with a delay of about 6 years in the emergence of an ice-free Arctic in boreal summer. In the troposphere, a weakened AMOC causes an anomalous cooling band stretching from the lower levels in high latitudes to the upper levels in the tropics and displaces the Northern Hemisphere midlatitude jets poleward.

虽然在人为变暖的情况下预计大西洋子午翻覆环流（AMOC）会变慢，但AMOC在未来气候变化中的确切作用尚未完全量化。在这里，我们提出了一种通过从北极亚极地区去除淡水来稳定人为变暖实验中AMOC强度的方法。这种方法使我们能够在具有全物理气候模型的实验中隔离AMOC的气候影响。我们的结果表明，AMOC的减弱可以解释格陵兰以南的海洋降温，类似于北大西洋的变暖洞，并且所有季节的北极海冰损失都减少了，在北方夏季无冰的北极出现时，延迟了大约6年。 。在对流层中