DOI: 10.1007/s00382-013-1832-7
Scopus记录号: 2-s2.0-84894293270
论文题名: Precipitation over eastern South America and the South Atlantic Sea surface temperature during neutral ENSO periods
作者: Bombardi R.J. ; Carvalho L.M.V. ; Jones C. ; Reboita M.S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-05-06 起始页码: 1553
结束页码: 1568
语种: 英语
英文关键词: Cyclones
; ENSO
; Precipitation
; South America
; South Atlantic Dipole
; SST
英文摘要: The dominant mode of coupled variability over the South Atlantic Ocean is known as "South Atlantic Dipole" (SAD) and is characterized by a dipole in sea surface temperature (SST) anomalies with centers over the tropical and the extratropical South Atlantic. Previous studies have shown that variations in SST related to SAD modulate large-scale patterns of precipitation over the Atlantic Ocean. Here we show that variations in the South Atlantic SST are associated with changes in daily precipitation over eastern South America. Rain gauge precipitation, satellite derived sea surface temperature and reanalysis data are used to investigate the variability of the subtropical and tropical South Atlantic and impacts on precipitation. SAD phases are assessed by performing Singular value decomposition analysis of sea level pressure and SST anomalies. We show that during neutral El Niño Southern Oscillation events, SAD plays an important role in modulating cyclogenesis and the characteristics of the South Atlantic Convergence Zone. Positive SST anomalies over the extratropical South Atlantic (SAD negative phase) are related to increased cyclogenesis near southeast Brazil as well as the migration of extratropical cyclones further north. As a consequence, these systems organize convection and increase precipitation over eastern South America. © 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/54257
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, University of California, Santa Barbara, CA, 93106-3060, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Natural Resources Institute, Federal University of Itajubá, Itajubá, Brazil
Recommended Citation:
Bombardi R.J.,Carvalho L.M.V.,Jones C.,et al. Precipitation over eastern South America and the South Atlantic Sea surface temperature during neutral ENSO periods[J]. Climate Dynamics,2014-01-01,42(2017-05-06)