Robust Arctic warming caused by projected Antarctic sea ice loss
Robust Arctic warming caused by projected Antarctic sea ice loss
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DOI：
10.1088/1748-9326/abaada
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发表时间：
2020-07
影响因子：
6.7
通讯作者：
M. England;L. Polvani;Lantao Sun
中科院分区：
文献类型：
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作者：
M. England;L. Polvani;Lantao Sun
在即将到来的世纪，北极和南极的海冰覆盖面积预计将大幅度减少。虽然许多研究都记录了北极海冰预计减少对中纬度和热带气候的潜在影响，但很少有人关注南极海冰减少的影响。在这里，使用全面的气候模型模拟，我们表明，本世纪末预计南极海冰损失的影响远远超出热带地区，并能够对北极气候产生相当大的影响。具体而言，我们的模型表明，北极表面将变暖1 °C，北极海冰范围将减少0.5 × 106 km2，以应对未来南极海冰的损失。此外，在额外的大气模拟的帮助下，我们表明，这种极点到极点的影响是介导的热带SST南极海冰损失的响应：这些模拟显示，罗斯贝波起源于热带太平洋的原因阿留申低压加深在北方冬季，带来温暖的空气进入北极，并导致海冰损失在白令海。这种两极间的信号突出了了解预计南极海冰减少的气候影响的重要性，这可能与预计北极海冰减少的气候影响同样重要。
Over the coming century, both Arctic and Antarctic sea ice cover are projected to substantially decline. While many studies have documented the potential impacts of projected Arctic sea ice loss on the climate of the mid-latitudes and the tropics, little attention has been paid to the impacts of Antarctic sea ice loss. Here, using comprehensive climate model simulations, we show that the effects of end-of-the-century projected Antarctic sea ice loss extend much further than the tropics, and are able to produce considerable impacts on Arctic climate. Specifically, our model indicates that the Arctic surface will warm by 1 °C and Arctic sea ice extent will decline by 0.5 × 106 km2 in response to future Antarctic sea ice loss. Furthermore, with the aid of additional atmosphere-only simulations, we show that this pole-to-pole effect is mediated by the response of the tropical SSTs to Antarctic sea ice loss: these simulations reveal that Rossby waves originating in the tropical Pacific cause the Aleutian Low to deepen in the boreal winter, bringing warm air into the Arctic, and leading to sea ice loss in the Bering Sea. This pole-to-pole signal highlights the importance of understanding the climate impacts of the projected sea ice loss in the Antarctic, which could be as important as those associated with projected sea ice loss in the Arctic.