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LAVOIE, D., Y. SIMARD, J. BENOÎT, P. LAROUCHE, B. THIBEAULT, 1996. Distribution des masses d'eau à la tête du chenal laurentien dans l'estuaire du Saint-Laurent aux étés 1994 et 1995. Rapp. tech. can. hydrogr. sci. océan., 176, 126 p .
Satellite thermal images and temperature and salinity profiles, taken during the summers of 1994 and 1995, are used to describe the water masses at the head of the Laurentian channel. The three typical water masses of this system; the surface, the intermediate and the bottom layers showed : 1) a thinning and an elevation of the cold intermediate layer at the end of the summer, associated with a thickening of the bottom layer, 2) a colder intermediate layer in 1995, 3) a recurrent spatial structure, characterized by a convergence of the cold intermediate layer off Les Escoumins. Upwelling of intermediate cold waters at the head of the Laurentian channel was observed most of the time, as well as many fronts associated with its contact with adjacent waters from the Saguenay and the upper estuary. Our results suggest that the intensity and occurrence of these phenomena were modulated by the fortnightly tidal cycle and by the wind which regularly generated cold water upwelling along the north shore.
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