This paper proposes the use of total alkalinity as a mixing index at the mouth of Saguenay fjord on the St. Lawrence estuary. The large difference in the total alkalinity between the fresh waters from the St. Lawrence River (1.475 meq/kg) and those from the Saguenay River (0.134 meq/kg) allows us to define and calculate a dilution factor relative to total alkalinity (δAt), which is very sensitive to the presence of the fjord marine water in the estuarine mixing area both at the surface and at depth. The authors show the advantage of use of the dilution factor (δAT) in comparison to some other classical oceanographic parameters such as temperature, salinity, density, and dissolved oxygen.

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