Oerder V. auteur aut IRD Colas François auteur aut IRD Echevin Vincent auteur aut IRD Masson S. auteur aut IRD Hourdin C. auteur aut IRD Jullien S. auteur aut IRD Madec G. auteur aut IRD Lemarie F. auteur aut IRD text journalArticle eng text/pdf born digital access Satellite observations and a high-resolution regional ocean-atmosphere coupled model are used to study the air/sea interactions at the oceanic mesoscale in the Peru-Chile upwelling current system. Coupling between mesoscale sea surface temperature (SST) and wind stress (WS) intensity is evidenced and characterized by correlations and regression coefficients. Both the model and the observations display similar spatial and seasonal variability of the coupling characteristics that are stronger off Peru than off Northern Chile, in relation with stronger wind mean speed and steadiness. The coupling is also more intense during winter than during summer in both regions. It is shown that WS intensity anomalies due to SST anomalies are mainly forced by mixing coefficient anomalies and partially compensated by wind shear anomalies. A momentum balance analysis shows that wind speed anomalies are created by stress shear anomalies. Near-surface pressure gradient anomalies have a negligible contribution because of the back-pressure effect related to the air temperature inversion. As mixing coefficients are mainly unchanged between summer and winter, the stronger coupling in winter is due to the enhanced large-scale wind shear that enables a more efficient action of the turbulent stress perturbations. This mechanism is robust as it does not depend on the choice of planetary boundary layer parameterization. specialized Ocean-atmosphere interactions Mesoscale SST-wind stress coupling Regional coupled modeling Eastern Boundary Upwelling System PEROU CHILI 032 126 020 47 7-8 2309-2330 2016 0930-7575 https://www.documentation.ird.fr/hor/fdi:010068216 10.1007/s00382-015-2965-7 0930-7575 [F B010068216] https://www.documentation.ird.fr/hor/fdi:010068216 https://www.documentation.ird.fr/intranet/publi/2016/11/010068216.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-12-06 2017-08-23 fdi:010068216 fre