Assimilation of sea-surface temperature in a doubly, two-way nested primitive equation model of the Ligurian Sea - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2003

Assimilation of sea-surface temperature in a doubly, two-way nested primitive equation model of the Ligurian Sea

Résumé

The GHER 3D primitive equation model is implemented with three different resolutions: a low resolution model (1/4^o) covering the whole Mediterranean Sea, an intermediate resolution model (1/20^o) of the Liguro-Provençal basin and a high resolution model (1/60^o) simulating the fine mesoscale structures in the Ligurian Sea. Boundary conditions and the averaged fields (feedback) are exchanged between two successive nesting levels. The model of the Ligurian Sea is also coupled with the assimilation package SESAM. It allows to assimilate satellite data and in situ observations using the local adaptative SEEK (Singular Evolutive Extended Kalman) filter. Instead of evolving the error space by the numerically expensive Lyapunov equation, a simplified algebraic equation depending on the misfit between observation and model forecast is used. Starting from the 1st January 1998 the low and intermediate resolution models are spun up for 18 months. The initial conditions for the Ligurian Sea are interpolated from the intermediate resolution model. The three models are then integrated until August 1999. During this period AVHRR Sea Surface Temperature of the Ligurian Sea is assimilated. The results are validated by using CTD and XBT profiles of the SIRENA cruise from the SACLANT Center. The overall objective of this study is pre-operational. It should help to identify limitations and weaknesses of forecasting methods and to suggest improvements of existing operational models.
Fichier non déposé

Dates et versions

hal-00230233 , version 1 (31-01-2008)

Licence

Paternité

Identifiants

  • HAL Id : hal-00230233 , version 1

Citer

Alexander Barth, Aida Alvera-Azcarate, Michel Rixen, Jean-Marie Beckers, Charles-Emmanuel Testut, et al.. Assimilation of sea-surface temperature in a doubly, two-way nested primitive equation model of the Ligurian Sea. EGS Conference, 2003, Nice, France. pp.1. ⟨hal-00230233⟩

Collections

UGA CNRS OSUG LEGI
129 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More