Abstract
Changes in Ca 2+ , alkalinity, dissolved inorganic carbon (DIC) and pH have occurred in the epilimnion of Onondaga Lake over a 10-yr period, in response to a major reduction in erternal Ca 2+ loading that resulted from the closure of an adjoining soda ash manufacturer. These changes included reduced Ca 2+ concentrations, diminished depletion of DIC and alkalinity in the upper waters in the summer, and a shift to higher pH values. Results of analyses from sediment trap collections before and after closure of the facility indicate approrimately 3-fold reductions in particulate inorganic carbon (PIC), and suspended solids deposition have occurred as a result of the closure
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