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

Type Article
Date 2017-11
Language English
Author(s) Jouanno Julien1, Hernandez Olga1, 2, Sanchez-Gomez Emilia3
Affiliation(s) 1 : Univ Toulouse, LEGOS, CNES, CNRS,IRD,UPS, Toulouse, France.
2 : Mercator Ocean, Ramonville St Agne, France.
3 : CECI CERFACS, Toulouse, France.
Source Earth System Dynamics (2190-4979) (Copernicus Gesellschaft Mbh), 2017-11 , Vol. 8 , N. 4 , P. 1061-1069
DOI 10.5194/esd-8-1061-2017
WOS© Times Cited 21
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 (R-2 = 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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