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PELLERIN, P., H. RITCHIE, F.J. SAUCIER, F. ROY, S. DESJARDINS, M. VALIN, V. LEE, 2004. Impact of a two-way coupling between an atmospheric and an ocean-ice model over the Gulf of St. Lawrence. Monthly Weather Rev., 132(6): 1379-1398 .
The purpose of this study is to present the impacts of a fully interactive coupling between an atmospheric and a sea ice model over the Gulf of St. Lawrence, Canada. The impacts are assessed in terms of the atmospheric and sea ice forecasts produced by the coupled numerical system. The ocean-ice model has been developed at the Maurice Lamontagne Institute, where it runs operationally at a horizontal resolution of 5 km and is driven (one-way coupling) by atmospheric model forecasts provided by the Meteorological Service of Canada (MSC). In this paper the importance of two-way coupling is assessed by comparing the one-way coupled version with a two-way coupled version in which the atmospheric model interacts with the sea ice model during the simulation. The impacts are examined for a case in which the sea ice conditions are changing rapidly. Two atmospheric model configurations have been studied. The first one has a horizontal grid spacing of 24 km, which is the operational configuration used at the Canadian Meteorological Centre. The second one is a high-resolution configuration with a 4-km horizontal grid spacing. A 48-h forecast has been validated using satellite images for the ice and the clouds, and also using the air temperature and precipitation observations. It is shown that the two-way coupled system improves the atmospheric forecast and has a direct impact on the sea ice forecast. It is also found that forecasts are improved with a fine resolution that better resolves the physical events, fluxes, and forcing. The coupling technique is also briefly described and discussed.©2004 American Meteorological Society
SAUCIER, F.J., S. SENNEVILLE, S. PRINSENBERG, F. ROY, G. SMITH, P. GACHON, D. CAYA, R. LAPRISE, 2004. Modelling the sea ice-ocean seasonal cycle in Hudson Bay, Foxe Basin and Hudson Strait, Canada. Climate Dynamics, 23 (3-4), Pages 303-326 .
The seasonal cycle of water masses and sea ice in the Hudson Bay marine system is examined using a three-dimensional coastal ice-ocean model, with 10 km horizontal resolution and realistic tidal, atmospheric, hydrologic and oceanic forcing. The model includes a level 2.5 turbulent kinetic energy equation, multi-category elastic-viscous-plastic sea-ice rheology, and two layer sea ice with a single snow layer. Results from a two-year long model simulation between August 1996 and July 1998 are analyzed and compared with various observations. The results demonstrate a consistent seasonal cycle in atmosphere-ocean exchanges and the formation and circulation of water masses and sea ice. The model reproduces the summer and winter surface mixed layers, the general cyclonic circulation including the strong coastal current in eastern Hudson Bay, and the inflow of oceanic waters into Hudson Bay. The maximum sea-ice growth rates are found in western Foxe Basin, and in a relatively large and persistent polynya in northwestern Hudson Bay. Sea-ice advection and ridging are more important than local thermodynamic growth in the regions of maximum sea-ice cover concentration and thickness that are found in eastern Foxe Basin and southern Hudson Bay. The estimate of freshwater transport to the Labrador Sea confirms a broad maximum during wintertime that is associated with the previous summers freshwater moving through Hudson Strait from southern Hudson Bay. Tidally driven mixing is shown to have a strong effect on the modeled ice-ocean circulation.©2004 Springer- Verlag
GALBRAITH, P.S., F.J. SAUCIER, N. MICHAUD, D. LEFAIVRE, R. CORRIVEAU, F. ROY, R. PIGEON, S. CANTIN, 2002. Shipborne monitoring of near-surface temperature and salinity in the Estuary and Gulf of St. Lawrence. AZMP Bull. PMZA, 2: 26-30 .
[Abstract only available in French]
Une collaboration entre le Service Météorologique du Canada, le Ministère des Pêches et des Océans et des armateurs a permis l'installation de thermosalinographes (TSG) à bord de trois navires commerciaux et d'un navire de la Garde Côtière naviguant sur le Saint-Laurent. Ces instruments permettent le suivi en temps réel de la température des eaux près de la surface via le Système Global de Télécommunication d'Environnement Canada et l'Observatoire du Saint-Laurent. Ces données sont ensuite assimilées dans des modèles de circulation océanique permettant de prévoir l'évolution de la couverture hivernale de la glace de mer et des conditions océanographiques dans l'estuaire et le golfe du Saint-Laurent. L'installation typique d'un appareil est illustrée de même que des exemples de diffusion des données. Après seulement quelques années de fonctionnement, les appareils déployés sur les navires commerciaux font déjà découvrir de nouveaux aspects de l'océanographie du Saint-Laurent.
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