Climate Dynamics

, Volume 43, Issue 11, pp 3071–3089

Recent climatic trends in the tropical Atlantic

  • Jacques Servain
  • Guy Caniaux
  • Yves K. Kouadio
  • Michael J. McPhaden
  • Moacyr Araujo

DOI: 10.1007/s00382-014-2168-7

Cite this article as:
Servain, J., Caniaux, G., Kouadio, Y.K. et al. Clim Dyn (2014) 43: 3071. doi:10.1007/s00382-014-2168-7


A homogeneous monthly data set of sea surface temperature (SST) and pseudo wind stress based on in situ observations is used to investigate the climatic trends over the tropical Atlantic during the last five decades (1964–2012). After a decrease of SST by about 1 °C during 1964–1975, most apparent in the northern tropical region, the entire tropical basin warmed up. That warming was the most substantial (>1 °C) in the eastern tropical ocean and in the longitudinal band of the intertropical convergence zone. Surprisingly, the trade wind system also strengthened over the peirod 1964–2012. Complementary information extracted from other observational data sources confirms the simultaneity of SST warming and the strengthening of the surface winds. Examining data sets of surface heat flux during the last few decades for the same region, we find that the SST warming was not a consequence of atmospheric heat flux forcing. Conversely, we suggest that long-term SST warming drives changes in atmosphere parameters at the sea surface, most notably an increase in latent heat flux, and that an acceleration of the hydrological cycle induces a strengthening of the trade winds and an acceleration of the Hadley circulation. These trends are also accompanied by rising sea levels and upper ocean heat content over similar multi-decadal time scales in the tropical Atlantic. Though more work is needed to fully understand these long term trends, especially what happens from the mid-1970’s, it is likely that changes in ocean circulation involving some combination of the Atlantic meridional overtuning circulation and the subtropical cells are required to explain the observations.


Tropical AtlanticClimatic trendsLong-term warming

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jacques Servain
    • 1
    • 6
  • Guy Caniaux
    • 2
  • Yves K. Kouadio
    • 3
  • Michael J. McPhaden
    • 4
  • Moacyr Araujo
    • 5
  1. 1.Institut de Recherche pour le Développement (IRD), UMR-182, LOCEANUniversité Paris-6Paris Cedex 05France
  2. 2.CRNM/GAME (Météo-France/CNRS)Toulouse CedexFrance
  3. 3.Laboratoire de Physique de l’Atmosphère (LPA), UFR-SSMTUniversity of CocodyAbidjan 22Ivory Coast
  4. 4.Pacific Marine Environmental LaboratoryNOAASeattleUSA
  5. 5.Departamento de OceanografiaUniversidade Federal de PernambucoRecifeBrazil
  6. 6.Fundação Cearense de Meteorologia e Recursos Hídricos (FUNCEME)FortalezaBrazil