气候变化领域集成服务门户(CCPortal): Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study

CCPortal

DOI	10.1175/JCLI-D-19-0720.1
	Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study
	Chen X.; Luo D.; Wu Y.; Dunn-Sigouin E.; Lu J.
发表日期	2021
ISSN	08948755
起始页码	2367
结束页码	2383
卷号	34 期号:6
英文摘要	Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents-Kara Seas (BKS) on the behavior of Ural blocking. Here the response of UB to stepwise tropospheric warming over the BKS is examined using a dry dynamic core model. Nonlinear responses are found in the frequency and local persistence of UB. The frequency and local persistence of the UB increase with the strength of BKS warming in a less strong range and decrease with the further increase of BKS warming, which is linked to the UB propagation influenced by upstream background atmospheric circulation. For a weak BKS warming, the UB becomes more persistent due to its less westward movement associated with intensified upstream zonal wind and meridional potential vorticity gradient (PVy) in the North Atlantic mid-high latitudes, which corresponds to a negative height response over the North Atlantic high latitudes. When BKS warming is strong, a positive height response appears in the early winter stratosphere, and its subsequent downward propagation leads to a negative NAO response or increased Greenland blocking events, which reduces zonal wind and PVy in the high latitudes from North Atlantic to Europe, thus enhancing the westward propagation of UB and reducing its local persistence. The transition to the negative NAO phase and the retrogression of UB are not found when numerically suppressing the downward influence of weakened stratospheric polar vortex, suggesting a crucial role of the stratospheric pathway in nonlinear responses of UB to the early winter BKS warming. © 2021 American Meteorological Society. All rights reserved.
英文关键词	Arctic; Asia; Atmosphere; Blocking; Europe; Nonlinear dynamics
语种	英语
scopus关键词	Climatology; Atmospheric blocking; Atmospheric circulation; High Latitudes; Idealized models; Non-linear response; Potential vorticity gradients; Stratospheric polar vortex; Tropospheric warming; Climate models; atmospheric blocking; atmospheric dynamics; atmospheric modeling; nonlinearity; polar vortex; potential vorticity; stratosphere; troposphere; warming; winter; zonal wind; Arctic; Arctic Ocean; Asia; Barents Sea; Eurasia; Europe; Greenland; Kara Sea
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178664
作者单位	Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China; CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, China; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Chen X.,Luo D.,Wu Y.,et al. Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study[J],2021,34(6).
APA	Chen X.,Luo D.,Wu Y.,Dunn-Sigouin E.,&Lu J..(2021).Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study.Journal of Climate,34(6).
MLA	Chen X.,et al."Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study".Journal of Climate 34.6(2021).