Impact of the Pacific sector sea ice loss on the sudden stratospheric warming characteristics
Impact of the Pacific sector sea ice loss on the sudden stratospheric warming characteristics
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DOI：
10.1038/s41612-022-00296-w
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发表时间：
2022-09
影响因子：
9
通讯作者：
Jiarong Zhang;Y. Orsolini;V. Limpasuvan;J. Ukita
中科院分区：
文献类型：
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作者：
Jiarong Zhang;Y. Orsolini;V. Limpasuvan;J. Ukita
大气层对北极海冰损失的反应仍然是一个备受争议的话题。大多数研究都集中在巴伦支-卡拉海的海冰退缩及其对对流层-平流层的影响。在这里，我们调查了楚科奇-白令海的大海冰损失的影响突然平流层变暖（SSW）的现象，在东风阶段的准两年振荡通过理想化的大集合实验的基础上，一个全球大气模型具有良好的解决平流层。虽然在秋季达到高潮，规定的海冰损失引起近地表变暖，持续到冬季和加深的SSW的发展。由此产生的温度差异在北太平洋上空形成了一个深气旋环流，这使得一个强烈的向上波数-2活动进入平流层，加强了气候学上的行星波模式。平流层放大的波强迫虽然不影响SSW的发生频率，但显著增加了SSW的持续时间和强度，增强了大陆上空的冷空气爆发。
The atmospheric response to Arctic sea ice loss remains a subject of much debate. Most studies have focused on the sea ice retreat in the Barents-Kara Seas and its troposphere-stratosphere influence. Here, we investigate the impact of large sea ice loss over the Chukchi-Bering Seas on the sudden stratospheric warming (SSW) phenomenon during the easterly phase of the Quasi-Biennial Oscillation through idealized large-ensemble experiments based on a global atmospheric model with a well-resolved stratosphere. Although culminating in autumn, the prescribed sea ice loss induces near-surface warming that persists into winter and deepens as the SSW develops. The resulting temperature contrasts foster a deep cyclonic circulation over the North Pacific, which elicits a strong upward wavenumber-2 activity into the stratosphere, reinforcing the climatological planetary wave pattern. While not affecting the SSW occurrence frequency, the amplified wave forcing in the stratosphere significantly increases the SSW duration and intensity, enhancing cold air outbreaks over the continents afterward.