气候变化领域集成服务门户(CCPortal): Climatology and dynamics of the link between dry intrusions and cold fronts during winter; Part II: Front-centred perspective

CCPortal

DOI	10.1007/s00382-019-04793-2
	Climatology and dynamics of the link between dry intrusions and cold fronts during winter; Part II: Front-centred perspective
	Raveh-Rubin S.; Catto J.L.
发表日期	2019
ISSN	0930-7575
起始页码	1893
结束页码	1909
卷号	53 期号:2020-03-04
英文摘要	The conceptual picture of an extratropical cyclone typically includes a cold front and a dry intrusion (DI) behind it. By objectively identifying fronts and DIs in ECMWF ERA-Interim data for 1979–2014, Part I quantified the climatological relationship between cold fronts and DIs. Driven by the finding that front intensity and frontal precipitation are enhanced in the presence of DIs, here we employ a front-centred perspective to focus on the dynamical and thermodynamical environment of cold fronts with and without DIs in the Northern Hemisphere winter. Distinguishing between trailing fronts (that connect to a parent cyclone) and isolated fronts, examples of DIs behind each type illustrate the baroclinic environment of the trailing front, and the lack of strong temperature gradients across the isolated front. Composite analyses of North Atlantic and North Pacific fronts outline the major differences in the presence of DIs, compared to similar fronts but without DIs in their vicinity. The magnitude and spatial structure of the modification by DIs depends on the front intensity. Yet, generally with DIs, trailing fronts occur with stronger SLP dipole, deeper upper-tropospheric trough, stronger 10-m wind gusts, enhanced ocean sensible and latent heat fluxes in the cyclone cold sector and heavier precipitation. Isolated weak fronts exhibit similar behaviour, with different spatial structure. This study highlights the central role of DIs for shaping the variability of fronts and their associated environment and impact. © 2019, The Author(s).
英文关键词	Cold sector; Composite analysis; Dry intrusions; Extratropical cyclones; Frontogenesis; Subtropical fronts
语种	英语
scopus关键词	climatology; cold front; conceptual framework; frontogenesis; general circulation model; Northern Hemisphere; regional climate; tropical cyclone; Atlantic Ocean; Atlantic Ocean (North); Pacific Ocean; Pacific Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146113
作者单位	Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Raveh-Rubin S.,Catto J.L.. Climatology and dynamics of the link between dry intrusions and cold fronts during winter; Part II: Front-centred perspective[J],2019,53(2020-03-04).
APA	Raveh-Rubin S.,&Catto J.L..(2019).Climatology and dynamics of the link between dry intrusions and cold fronts during winter; Part II: Front-centred perspective.Climate Dynamics,53(2020-03-04).
MLA	Raveh-Rubin S.,et al."Climatology and dynamics of the link between dry intrusions and cold fronts during winter; Part II: Front-centred perspective".Climate Dynamics 53.2020-03-04(2019).