DOI: 10.1007/s00382-013-1998-z
Scopus记录号: 2-s2.0-84902008976
论文题名: The relationship between South Atlantic SST and SACZ intensity and positioning
作者: Jorgetti T. ; da Silva Dias P.L. ; de Freitas E.D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-11-12 起始页码: 3077
结束页码: 3086
语种: 英语
英文关键词: Atlantic dipole
; Sea-surface-temperature anomalies
; Singular value decomposition
; South Atlantic Convergence Zone
英文摘要: This study explores the ocean-atmosphere interaction in the formation and dynamics of the South Atlantic Convergence Zone (SACZ), through the analysis of the heat sources estimated through the outgoing longwave radiation. The results obtained with this study show that the coupled variability between SACZ and the South Atlantic Ocean indicates that in northern positioned SACZ cases (over Southeastern Brazil), westerly anomalies are verified in the low level continental tropical circulation, consistent with the active phase of the South America Monsoon System (SAMS). In these cases, cold anomalies in the subtropical Atlantic Ocean cause an increase in the continent-ocean temperature gradient, favoring an easterly flow in this region, and blocking the SACZ at a northerly position. Easterly anomalies in the tropical continent were verified in the low level circulation in southern positioned cases (over Southern Brazil), consistent with the SAMS break phase. The SST anomaly patterns indicate cold anomalies in the tropics and warm anomalies in the subtropics, which do not favor the development of an easterly flow at low levels over the western tropical Atlantic. In these cases, two situations may occur: the strengthening of the Low Level Jet (LLJ), which prevails in the eastern subtropical South America and convergence with the South Atlantic Subtropical High at its southern position; or the atmospheric unstable conditions caused by ocean warm SST anomalies (in this case the LLJ may be weaker than its climatological intensity). © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54350
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão, 1226, Cidade Universitária, São Paulo, SP, CEP 05508-090, Brazil; National Laboratory of Scientific Computation, Av. Getúlio Vargas, 333, Quitandinha, Petrópolis, RJ, CEP 25651-075, Brazil
Recommended Citation:
Jorgetti T.,da Silva Dias P.L.,de Freitas E.D.. The relationship between South Atlantic SST and SACZ intensity and positioning[J]. Climate Dynamics,2014-01-01,42(2017-11-12)