An eddy permitting model of the Atlantic circulation : evaluating open boundary conditions - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research Année : 2001

An eddy permitting model of the Atlantic circulation : evaluating open boundary conditions

Résumé

As part of the French CLIPPER project, an eddy permitting model of the Atlantic circulation has been run for 22 years. The domain has open boundaries at Drake passage and at 30°E, from Africa to Antarctica. The simulated mean circulation, as well as the eddy activity, is satisfactory for a 1/3° model resolution, and the meridional heat transport at 30°S is within the range estimated from observations. We use the “mixed” open boundary algorithm of Barnier et al. [1998], which has both a radiation condition and a relaxation to climatology. The climatological boundary forcing strongly constrains the solution in the whole domain. The model heat balance adjusts through the surface (heat flux retroaction term) more than the open boundaries. The radiation phase velocities calculated within the algorithm are analyzed. This shows, quite surprisingly, that both the eastern and western boundaries have a similar behavior, regardless of the preferred directions for advection (mainly eastward) and wave propagation (mainly westward). Our results confirm that open boundary algorithms behave differently according to the dynamics of the region considered. The passive boundary condition that Penduff et al. [2000] applied successfully in the north eastern Atlantic does not work in the present South Atlantic model. We emphasize the need for a careful prescription of the climatology at the open boundary, for which a new approach based on synoptic sections is implemented.
Fichier principal
Vignette du fichier
2000JC000376.pdf (2.07 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00182337 , version 1 (25-01-2021)

Identifiants

Citer

Anne-Marie Tréguier, Bernard Barnier, A. P. de Miranda, Jean-Marc Molines, Nicolas Grima, et al.. An eddy permitting model of the Atlantic circulation : evaluating open boundary conditions. Journal of Geophysical Research, 2001, 106 (C10), pp.22.115-22.129. ⟨10.1029/2000JC000376⟩. ⟨hal-00182337⟩
493 Consultations
48 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More