气候变化领域集成服务门户(CCPortal): The properties and genesis environments of South Atlantic cyclones

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DOI	10.1007/s00382-019-04778-1
	The properties and genesis environments of South Atlantic cyclones
	Gramcianinov C.B.; Hodges K.I.; Camargo R.
发表日期	2019
ISSN	0930-7575
起始页码	4115
结束页码	4140
卷号	53 期号:2020-07-08
英文摘要	A new climatology of South Atlantic cyclones is produced to provide new insights into the conditions leading to genesis in different regions of the domain. Cyclones are identified and tracked based on the relative vorticity at 850 hPa computed from the NCEP-CFSR winds. The characteristics of the cyclones are obtained by diagnostic variables sampled within a radial distance from the cyclone centers to produce the spatial distribution of cyclone properties at the time of genesis. Also, cyclone centered composites are used to analyze the cyclone structure and evolution during their genesis. There are four main cyclogenesis regions in the South Atlantic Ocean: the Southern Brazilian coast (SE-BR, 30 ∘S), over the continent near the La Plata river discharge region (LA PLATA, 35 ∘S), the southeastern coast of Argentina (ARG, 40 ∘S –55 ∘S) and the Southeastern Atlantic (SE-SAO, centered at 45 ∘S and 10 ∘W). We found that cyclogenesis northward of 35 ∘S occurs mainly due to low-level forcing associated with moisture transport in the summer, and is associated with upper-level forcing in the winter due to a strong baroclinic environment. Southward of 35 ∘S , cyclones develop in a high baroclinic environment throughout the year with only a small influence from moist processes. The cyclone composites reveal that SE-BR and SE-SAO cyclones are associated with secondary development, the LA PLATA cyclones development is influenced by an orographic low in their early stages, and ARG cyclones are influenced by thermal advection as an essential mechanism in the reduction of static stability. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Cyclogenesis; Extratropical cyclones; South America; Storm track
语种	英语
scopus关键词	advection; atmospheric dynamics; baroclinic motion; cyclogenesis; extratropical cyclone; mesoscale meteorology; orographic effect; spatial distribution; storm track; Argentina; Atlantic Coast [Brazil]; Atlantic Coast [South America]; Atlantic Coast [South America]; Atlantic Ocean; Atlantic Ocean (South); Atlantic Ocean (Southeast); Brazil; Rio de la Plata; South America
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/145973
作者单位	Departamento de Ciências Atmosféricas, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitária, São Paulo, SP, Brazil; Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Gramcianinov C.B.,Hodges K.I.,Camargo R.. The properties and genesis environments of South Atlantic cyclones[J],2019,53(2020-07-08).
APA	Gramcianinov C.B.,Hodges K.I.,&Camargo R..(2019).The properties and genesis environments of South Atlantic cyclones.Climate Dynamics,53(2020-07-08).
MLA	Gramcianinov C.B.,et al."The properties and genesis environments of South Atlantic cyclones".Climate Dynamics 53.2020-07-08(2019).