%0 Unpublished Work
%9 AP : Autres productions
%A Lemarié, F.
%A Marchesiello, Patrick
%A Debreu, L.
%A Blayo, E.
%T Sensitivity of ocean-atmosphere coupled models to the coupling method : example of tropical cyclone Erica
%C Saint Ismier
%D 2014
%L fdi:010076276
%G ENG
%I INRIA
%K COUPLAGE OCEAN ATMOSPHERE ; MODELE MATHEMATIQUE ; ALGORITHME
%P 32  multigr.
%U https://www.documentation.ird.fr/hor/fdi:010076276
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-07/010076276.pdf
%V 8651
%W Horizon (IRD)
%X In this paper, the sensitivity of Atmospheric and Oceanic Coupled Models (AOCMs) to the coupling method is investigated. We propose the adaptation of a Schwarz-like domain decomposition method to AOCMs. We show that the iterative process of the method ensures consistency of the coupled solution across the air-sea interface, contrarily to usual 	extit{ad-hoc} algorithmic approaches. The latter are equivalent to only one iteration of a Schwarz-like iterative method, which does not provide a converged state. It is generally assumed that this lack of consistency does not affect significantly the physical properties of the solution. The relevancy of this statement is first assessed in a simplified problem, then in the realistic application of a mesoscale atmospheric model (WRF) coupled with a regional oceanic model (ROMS) to simulate the genesis and propagation of tropical cyclone Erica. Sensitivity tests to the coupling method are carried out in an ensemble approach.We show that with a mathematically consistent coupling the spread of the ensemble is reduced,suggesting that there is room for further improvements in the formulation of AOCMs at a mathematicaland numerical level.
%$ 020MATH01 ; 032CLIMET