DOI: 10.1007/s00382-011-1116-z
Scopus记录号: 2-s2.0-84860321171
论文题名: Seasonal variations of the links between the interannual variability of South America and the South Pacific
作者: Zamboni L. ; Kucharski F. ; Mechoso C.R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-09-10 起始页码: 2115
结束页码: 2129
语种: 英语
英文关键词: ENSO teleconnections
; Interannual variability
; PSA modes
; South America
英文摘要: The present study focuses on the leading interannual mode of continental-scale atmospheric variability over South America, which is characterized by an equivalent barotropic vortex (referred to as VOSA in the text) centered over the eastern subtropical coast of the continent. The principal aim is to determine whether and in what season VOSA is the downstream extension of the leading Pacific South American mode (PSA1). Another objective is to examine the extent to which VOSA and PSA1 are forced by El Niño Southern Oscillation (ENSO). The research is based on examination of reanalysis data and output of experiments with an atmospheric general circulation model. The emphasis is on the southern spring, summer and fall seasons, during which VOSA modulates the interannual precipitation variability over the continent. A similar relationship is not found during the southern winter. It is found that VOSA is an integral part of PSA1 during spring and fall. In these seasons, PSA1/VOSA is originated primarily by large-scale atmospheric internal variability with the forcing by ENSO accounting for 14 and 8% of the total variance, respectively. During the southern summer season, when ENSO peaks, PSA1 is not a dominant mode of atmospheric variability, and VOSA primarily results from continental-scale internal variability. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55310
Appears in Collections: 过去全球变化的重建
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作者单位: Mathematics and Computer Science Division, Argonne National Laboratory, 9700 S.Cass Ave TCS Bldg #240, Argonne, IL 60439, United States; Earth System Physics Section, Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy; Department of Atmospheric and Oceanic Sciences, University of California Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Zamboni L.,Kucharski F.,Mechoso C.R.. Seasonal variations of the links between the interannual variability of South America and the South Pacific[J]. Climate Dynamics,2012-01-01,38(2017-09-10)