期刊
JOURNAL OF CLIMATE
卷 35, 期 13, 页码 4013-4026出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-21-0905.1
关键词
Stratospheric circulation; Polar lows; Stratosphere-troposphere coupling
资金
- Office of Naval Research [N000141812216]
- National Science Foundation [ARC-1602720]
- U.S. Department of Defense (DOD) [N000141812216] Funding Source: U.S. Department of Defense (DOD)
This study examines the impacts of sudden stratospheric warmings (SSWs) on polar low activity in the subarctic North Atlantic. The results show that SSWs can decrease polar low activity over the Labrador Sea, but the impact on the Nordic seas depends on the spatial structure of the SSW event.
Polar lows (PLs) are intense maritime mesoscale cyclones that can pose hazards to coastal communities and marine operation in the Arctic. This study examines the impacts of sudden stratospheric warmings (SSWs) on PL activity in the subarctic North Atlantic. The 20 days following SSWs are characterized by tropospheric circulation anomalies resembling the negative phase of the North Atlantic Oscillation. PL activity decreases significantly over the Labrador Sea, which can be attributed to the infrequent occurrence of low static stability and strong environmental baroclinicity, as well as reduced surface turbulent heat fluxes. These results suggest that a skillful prediction of SSWs can improve the extendedrange forecast of PL activity over the Labrador Sea. For the Nordic seas, the results imply that the spatial structure of an SSW event is important for the PL modulation through different tropospheric circulation patterns. Situations with increased PL frequency in the Nordic seas are characterized by SSWs centered close to northern Greenland occurring over a smaller area, and a tropospheric response featuring enhanced cold-air outbreaks over the Norwegian Sea. Conversely, PL activity is suppressed over the Nordic seas when the SSW favors the formation of a tropospheric anticyclone above Greenland and Scandinavia.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据