Publications des scientifiques de l'IRD

Lemarié F., Marchesiello Patrick, Debreu L., Blayo E. (2014). Sensitivity of ocean-atmosphere coupled models to the coupling method : example of tropical cyclone Erica. Saint Ismier : INRIA, 8651, 32 p. multigr. (Research Report - Inria). ISSN 0249-6399.

Titre du document
Sensitivity of ocean-atmosphere coupled models to the coupling method : example of tropical cyclone Erica
Année de publication
2014
Type de document
Littérature grise
Auteurs
Lemarié F., Marchesiello Patrick, Debreu L., Blayo E.
Source
Saint Ismier : INRIA, 2014, 32 p. multigr. (Research Report - Inria). ISSN 0249-6399
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.
Plan de classement
Mathématiques appliquées [020MATH01] ; Climatologie / Météorologie [032CLIMET]
Descripteurs
COUPLAGE OCEAN ATMOSPHERE ; MODELE MATHEMATIQUE ; ALGORITHME
Localisation
Fonds IRD [F B010076276]
Identifiant IRD
fdi:010076276
Contact