Isotopic Composition of Dissolved Inorganic Carbon in the Great Lakes

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Abstract
Values for the .delta.13C of the dissolved total inorganic C in the Great Lakes are presented. The surface values are about 2 parts per thousand more negative than the values to be expected assuming equilibrium with the atmospheric CO2 reservoir. In the hypolimnion of Lake Erie, the values become more negative as the summer progresses due to the increasing amounts of CO2 from decaying organic matter. Although Lakes Erie and Ontario receive considerably larger amounts of organic C as domestic and industrial sewage effluents than the upper Great Lakes, their higher inorganic C concentrations evidently mask any isotopic effects from the decay of the organic pollutants. Models to explain the variation in the .delta.13C in the hypolimnion and epilimnion of a lake are presented. The agreement between predicted and observed .delta.13C trends for the hypolimnion model is reasonable, suggesting that the flux rates assumed in the model are reasonable for the processes occurring in the lakes.

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