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Geophysical Monograph Series

 

Keywords

  • Ocean-atmosphere interaction
  • Climatic changes

Article

GEOPHYSICAL MONOGRAPH SERIES, VOL. 147, PP. 143-156, 2004

On the role of the south Atlantic atmospheric circulation in tropical Atlantic variability

Marcelo Barreiro


Alessandra Giannini

International Research Institute for Climate Prediction, Columbia University, Palisades, New York


Ping Chang

Department of Oceanography, Texas A&M University, College Station, Texas


R. Saravanan

National Center for Atmospheric Research, Boulder, Colorado


One dominant manifestation of tropical Atlantic variability (TAV) takes place in March-April-May in the form of a strong inter-hemispheric sea surface temperature gradient coupled to a cross-equatorial near surface atmospheric flow. The variability of this circulation pattern affects the position of the intertropical convergence zone and the regional climate in the surrounding areas. In this study, we investigated the effect of the South Atlantic atmospheric variability on this phenomenon. We found that southern summer atmospheric variability (and to a lesser extent winter variability) can play a pre-conditioning role in the onset of inter-hemispheric anomalies in the deep tropics during the following austral fall. It does so by inducing a sea surface temperature anomaly in the southern tropics that initiates local thermodynamic air-sea feedbacks. This remote influence of the Southern Hemisphere on TAV is contrasted with the remote influence of El Niño-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) during austral summer. The results suggest that to fully understand TAV and its predictability it is necessary to consider not only the remote influences from ENSO and NAO, but also the influence from the South Atlantic atmospheric circulation.

Citation: Barreiro, M., A. Giannini, P. Chang, and R. Saravanan (2004), On the role of the south Atlantic atmospheric circulation in tropical Atlantic variability, in Earth's Climate: The Ocean-Atmosphere Interaction, Geophys. Monogr. Ser., vol. 147, edited by C. Wang, S.-P. Xie, and J. A. Carton, pp. 143–156, AGU, Washington, D. C., doi:10.1029/147GM08.

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