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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
SENNEVILLE, S., F.J. SAUCIER, P. GACHON, R. LAPRISE, D. CAYA, 2002. Development of a Coupled Ice-Ocean Model of Hudson Bay. World Meteorological Organization, Research activities in atmospheric and oceanic modelling, TD 1105, Rep. 32: 23-24 .
WEISE, A.M., M. LEVASSEUR, F.J. SAUCIER, S. SENNEVILLE, E. BONNEAU, S. ROY, G. SAUVÉ, S. MICHAUD, J. FAUCHOT, 2002. The link between precipitation, river runoff, and blooms of the toxic dinoflagellate Alexandrium tamarense in the St. Lawrence. Can. J. Fish. Aquat. Sci., 59: 464-473 .
Blooms of the toxic dinoflagellate Alexandrium tamarense, which is responsible for paralytic shellfish poisoning, are annually recurrent events in the Estuary and Gulf of St. Lawrence, Quebec, Canada. The analysis of abundance data for this algal species between 1989 and 1998 at Sept-Iles, a presumed initiation site in the north-western Gulf of St. Lawrence, revealed yearly fluctuations in the onset, duration, and magnitude of toxic A. tamarense blooms. Hydrological and meteorological data for the region indicate that rainfall, Moisie River runoff, and wind are highly related to the pattern of bloom development each year. Results from the 10-year data set reveal that in this system: 1) high Moisie River runoff from a prolonged spring freshet or from heavy rainfall events in the summer and fall can initiate A. tamarense blooms; 2) high Moisie River runoff combined with prolonged periods of weak winds (< 4 m times s-1) favour the continued development of blooms; and 3) winds > 8 m times s-1 disrupt blooms. Salinity, which reflects the general state of the water column in terms of freshwater input and stability, had a strong negative correlation with the probability of observing A. tamarense cells at this station and could thus be used as a predictive tool for the presence of cells in this system.
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