DOI: 10.1007/s00382-011-1113-2
Scopus记录号: 2-s2.0-84857443089
论文题名: Atmospheric circulation associated with extreme generalized frosts persistence in central-southern South America
作者: Müller G.V. ; Berri G.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-05-06 起始页码: 837
结束页码: 857
语种: 英语
英文关键词: Atmospheric circulation
; Extreme persistence
; Generalized frost
; South America
英文摘要: Generalized frosts (GF) in central-southern South America have a strong impact due to their spatial extension, and they are especially important when they become persistent. This paper aims at identifying the atmospheric circulation features that determine the extreme GF persistence, i. e. very persistent and without persistence, and the differences between them, during the 1961-1990 winters. Since the GF without persistence group outnumbers the other one, two subgroups are composed with events selected from winters with maximum and minimum frequency of GF occurrence, respectively. Additionally, the individual event of July 1988 within the very persistent GF group is analyzed due to its exceptional persistence. GF persistence is mainly conditioned by two large-scale dynamic factors. One is the Rossby wave train propagation across the Pacific Ocean, and the other one is the location with respect to the continent and the magnitude of the confluence in the jet entrance region in subtropical latitudes. A predominantly meridional Rossby wave train propagation with a confluence region to the west of the continent prior to the event favors GF with intermediate (null) persistence depending on the greater (lesser) jet acceleration. This is conditioned by the magnitude of the confluence, which, in turn, depends on the disposition of the wave train propagation pattern. Instead, an essentially zonal propagation with a confluence region to the east of the continent favors the GF persistence for several days, yet if there is no confluence the event does not persist. The greatest persistence of an event combines the confluence/diffluence of the jet entrance/exit region, which depends on the disposition with respect to the continent of the zonally propagating Rossby wave trains. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55347
Appears in Collections: 过去全球变化的重建
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作者单位: Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion, Diamante, Materi y España, s/n, CP 3105 Diamante, Entre Ríos, Argentina; Servicio Meteorológico Nacional - CONICET, Buenos Aires, Argentina
Recommended Citation:
Müller G.V.,Berri G.J.. Atmospheric circulation associated with extreme generalized frosts persistence in central-southern South America[J]. Climate Dynamics,2012-01-01,38(2017-05-06)