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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 4
Earth Syst. Dynam., 8, 1061-1069, 2017
https://doi.org/10.5194/esd-8-1061-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Earth Syst. Dynam., 8, 1061-1069, 2017
https://doi.org/10.5194/esd-8-1061-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Nov 2017

Research article | 30 Nov 2017

Equatorial Atlantic interannual variability and its relation to dynamic and thermodynamic processes

Julien Jouanno1, Olga Hernandez2,1, and Emilia Sanchez-Gomez3 Julien Jouanno et al.
  • 1LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, Toulouse, France
  • 2Mercator-Océan, Ramonville Saint Agne, France
  • 3CECI/CERFACS, Toulouse, France

Abstract. The contributions of the dynamic and thermodynamic forcing to the interannual variability of the equatorial Atlantic sea surface temperature (SST) are investigated using a set of interannual regional simulations of the tropical Atlantic Ocean. The ocean model is forced with an interactive atmospheric boundary layer, avoiding damping toward prescribed air temperature as is usually the case in forced ocean models. The model successfully reproduces a large fraction (R2 = 0.55) of the observed interannual variability in the equatorial Atlantic. In agreement with leading theories, our results confirm that the interannual variations of the dynamical forcing largely contributes to this variability. We show that mean and seasonal upper ocean temperature biases, commonly found in fully coupled models, strongly favor an unrealistic thermodynamic control of the equatorial Atlantic interannual variability.

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