North American cold events following sudden stratospheric warming in the presence of low Barents-Kara Sea sea ice

North American cold events following sudden stratospheric warming in the presence of low Barents-Kara Sea sea ice
复制标题

巴伦支海-喀拉海低海冰存在导致平流层突然变暖后的北美寒冷事件

DOI:
10.1088/1748-9326/abc215
复制
发表时间:
2020
影响因子:
6.7
通讯作者:
Yu, Yueyue
Yu, Yueyue
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Zhang, Pengfei;Wu, Yutian;Chen, Gang;Yu, Yueyue

文献摘要

参考文献

被引文献

相似文献

北极海冰消融与中纬度冬季气候之间的关系已经得到了很好的讨论,特别是在季节平均尺度上,但北极海冰状况是否会影响北美寒冷天气在亚季节时间尺度上的可预报性尚不清楚。我们发现,在低巴伦支喀拉海(BKS)海冰存在的情况下,平流层突然变暖(SSW)可以在基于观测和模式实验的亚季节时间尺度上有利于北美上空的地面冷期。SSW爆发几周后,在白令海-阿拉斯加湾上空出现了一个持续的第2浪脊型,从平流层到地面有一个连贯的结构,这反过来又有利于加拿大和美国中西部的天气性冷空气爆发。这突出了与BKS海冰变化有关的行星波路径,通过该路径,平流层极涡在亚季节尺度上影响区域表面温度。相反,BKS海冰正异常不存在这种机制。这些发现有助于提高北美地区的次季节可预报性,特别是在全球变暖的北极海冰迅速变化的背景下。
While the relationship between the Arctic sea ice loss and midlatitude winter climate has been well discussed, especially on the seasonal mean scale, it remains unclear whether the Arctic sea ice condition affects the predictability of North American cold weather on the subseasonal time scale. Here we find that, in the presence of low Barents-Kara Sea (BKS) sea ice, sudden stratospheric warmings (SSWs) can favor surface cold spells over North America at the subseasonal timescale based on observations and model experiments. A persistent ridge of wave-2 pattern emerges over the Bering Sea-Gulf of Alaska several weeks after the SSW onset, with a coherent structure from the stratosphere to the surface, which, in turn, is conducive to synoptic cold air outbreaks in Canada and midwestern USA. This highlights a planetary wave pathway relating to BKS sea ice changes, by which the stratospheric polar vortex impacts the regional surface temperature on the subseasonal scale. In contrast, this mechanism does not occur with positive BKS sea ice anomaly. These findings help to improve the subseasonal predictability over North America, especially under the background of rapid change of Arctic sea ice in a warming world.
DOI: 10.1175/jcli-d-16-0197.1
发表时间: 2017-06-01
期刊: JOURNAL OF CLIMATE
影响因子: 4.9
作者:
Screen, James A.
通讯作者: Screen, James A.
DOI: 10.1002/2015jd023860
发表时间: 2016-02
期刊: Journal of Geophysical Research: Atmospheres
影响因子: --
作者:
Ilari Lehtonen;A. Karpechko
通讯作者: Ilari Lehtonen;A. Karpechko
北极秋季海冰与北半球冬季预报技能之间的联系
DOI: --
发表时间: 2020
影响因子: 5.2
作者:
J. C. A. Navarro;Pablo Ortega;L. Batté;D. Smith;P. Bretonnière;V. Guemas;F. Massonnet;V. Sicardi;V. Torralba;É. Tourigny;F. Doblas
通讯作者: F. Doblas
QBO 相位对预计初冬北极海冰流失的大气响应的影响
DOI: --
发表时间: 2019
影响因子: 5.2
作者:
Z. Labe;Y. Peings;G. Magnusdottir
通讯作者: G. Magnusdottir
DOI: 10.1038/s41558-019-0551-4
发表时间: 2019-09-01
影响因子: 30.7
作者:
Blackport, Russell;Screen, James A.;Bintanja, Richard
通讯作者: Bintanja, Richard