DOI: 10.1007/s00382-016-3223-3
Scopus记录号: 2-s2.0-84976306126
论文题名: Interannual variability of the frontal activity in the Southern Hemisphere: relationship with atmospheric circulation and precipitation over southern South America
作者: Blázquez J. ; Solman S.A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-07-08 起始页码: 2569
结束页码: 2579
语种: 英语
英文关键词: Atmospheric circulation
; Frontal activity
; Interannual variability
; Precipitation
; Southern Hemisphere
英文摘要: The interannual variability of the frontal activity over the western Southern Hemisphere and its linkage with the variability of the atmospheric circulation and precipitation over southern South America is studied. The analysis is focused on the austral winter and spring seasons. The frontal activity is represented by an index defined as the product between the horizontal gradient of temperature and the relative vorticity at 850 hPa (FI) and is computed from the ERA Interim and NCEP2 reanalysis. For the two seasons the main mode of variability of FI, as depicted by the first Empirical Orthogonal Function, presents centres of action located in the southern part of the western Southern Hemisphere. This pattern is present in the two reanalysis datasets. The correlation coefficients between the principal component of the leading mode of FI and the two main modes of the 500 hPa geopotential height indicate that both the ENSO-mode and the SAM modulate the leading pattern of FI in winter while during the spring season the ENSO-mode controls the FI variability. The variability of the FI has a robust influence on the interannual variability of precipitation over southern South America and adjacent oceans. Over the continent, it was found that the pattern of precipitation anomalies associated with the variability of the FI depicts significant signals over southeastern South America (SESA), centre and south of Chile for winter and over SESA and southeastern Brazil for spring and agrees with the pattern of the leading mode of precipitation variability over southern South America. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53292
Appears in Collections: 过去全球变化的重建
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作者单位: Centro de Investigaciones del Mar y la Atmósfera (CIMA-CONICET/FCEN-UBA), Departamento de Ciencias de la Atmósfera y los Océanos (FCEN-UBA), Instituto Franco Argentino del Clima y sus Impactos (UMI IFAECI/CNRS), Ciudad Universitaria Pabellón II Piso 2, Buenos Aires, Argentina
Recommended Citation:
Blázquez J.,Solman S.A.. Interannual variability of the frontal activity in the Southern Hemisphere: relationship with atmospheric circulation and precipitation over southern South America[J]. Climate Dynamics,2017-01-01,48(2017-07-08)