DOI: 10.1007/s00382-015-2929-y
Scopus记录号: 2-s2.0-84949974039
论文题名: Intraseasonal variability of the Atlantic Intertropical Convergence Zone during austral summer and winter
作者: Tomaziello A.C.N. ; Carvalho L.M.V. ; Gandu A.W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-05-06 起始页码: 1717
结束页码: 1733
语种: 英语
英文关键词: Atlantic ITCZ
; Intraseasonal variability
; Madden–Julian oscillation
; Rossby waves
英文摘要: The Atlantic Intertropical Convergence Zone (A-ITCZ) exhibits variations on several time-scales and plays a crucial role in precipitation regimes of northern South America and western Africa. Here we investigate the variability of the A-ITCZ on intraseasonal time-scales during austral summer (November–March) and winter (May–September) based on a multivariate index that describes the main atmospheric features of the A-ITCZ and retains its variability on interannual, semiannual, and intraseasonal time-scales. This index is the time coefficient of the first combined empirical orthogonal function mode of anomalies (annual cycle removed) of precipitation, and zonal and meridional wind components at 850 hPa from the climate forecast system reanalysis (1979–2010). We examine associations between the intraseasonal variability of the A-ITCZ and the activity of the Madden–Julian oscillation (MJO). We show that during austral summer intraseasonal variability of the A-ITCZ is associated with a Rossby wave train in the Northern Hemisphere. In austral winter this variability is associated with the propagation of a Rossby wave in the Southern Hemisphere consistent with the Pacific-South American pattern. Moreover, we show that intense A-ITCZ events on intraseasonal time-scales are more frequent during the phase of MJO characterized by convection over western Pacific and suppression over the Indian Ocean. These teleconnection patterns induce anomalies in the trade winds and upper level divergence over the equatorial Atlantic that modulate the intensity of the A-ITCZ. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53565
Appears in Collections: 过去全球变化的重建
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作者单位: Departament of Atmospheric Sciences, University of São Paulo, São Paulo, Brazil; Department of Geography, University of California, Santa Barbara, CA, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Research Institute for Meteorology and Water Resources, FUNCEME, Fortaleza, Brazil
Recommended Citation:
Tomaziello A.C.N.,Carvalho L.M.V.,Gandu A.W.. Intraseasonal variability of the Atlantic Intertropical Convergence Zone during austral summer and winter[J]. Climate Dynamics,2016-01-01,47(2017-05-06)