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
中科院分区:
文献类型:
--
作者:
Zhang, Pengfei;Wu, Yutian;Chen, Gang;Yu, Yueyue
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.
登录
查看更多内容
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
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
影响因子:
5.2
作者:
Z. Labe;Y. Peings;G. Magnusdottir
通讯作者:
G. Magnusdottir
影响因子:
30.7
作者:
Blackport, Russell;Screen, James A.;Bintanja, Richard
通讯作者:
Bintanja, Richard