Sensitivity of the Humboldt Current system to global warming: a downscaling experiment of the IPSL-CM4 model

Vincent Echevin 1 Katerina Goubanova Ali Belmadani Boris Dewitte
1 PHYBIOCAR - Couplage physique-biogéochimie-carbone
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
Abstract : The impact of climate warming on the seasonal variability of the Humboldt Current system ocean dynamics is investigated. The IPSL-CM4 large scale ocean circulation resulting from two contrasted climate scenarios, the so-called Preindustrial and quadrupling CO2, are downscaled using an eddy-resolving regional ocean circulation model. The intense surface heating by the atmosphere in the quadrupling CO2 scenario leads to a strong increase of the surface density stratification, a thinner coastal jet, an enhanced Peru-Chile undercurrent, and an intensification of nearshore turbulence. Upwelling rates respond quasi-linearly to the change in wind stress associated with anthropogenic forcing, and show a moderate decrease in summer off Peru and a strong increase off Chile. Results from sensitivity experiments show that a 50% wind stress increase does not compensate for the surface warming resulting from heat flux forcing and that the associated mesoscale turbulence increase is a robust feature.
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Submitted on : Monday, November 19, 2012 - 5:30:53 PM
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Vincent Echevin, Katerina Goubanova, Ali Belmadani, Boris Dewitte. Sensitivity of the Humboldt Current system to global warming: a downscaling experiment of the IPSL-CM4 model. Climate Dynamics, Springer Verlag, 2012, 38, pp.761-774. ⟨10.1007/S00382-011-1085-2⟩. ⟨hal-00753883⟩

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