Spatial and temporal distiibutions of inorganic carbon and related ionic species (Ca-+ , H') were monitored weekly for 1 year in Cazenovia Lake, a small mesotrophic marl lake. Attendant [H,CO:t]([H,CO;,] + [CO,(aq)]) and CaCO:, equilibtium conditions were determined through application of equilibrium equations adjusted for appropriate temperatures and ionic strength.A seasonal cycle was demonstrated for the inorganic carbon species whieh was temporally correlated to the lake's thermal and productivity cycles. Vertical homogeneity in carbonate chemistry was evident during turnover periods while dramatic differences developed between the epilimnion and hypolimnion during winter and summer stratification. The lake was supersaturated throughout the year with H^CO*, though saturation was approached during the productive summer months in the epilimnion. The epilimnion was supersaturated with respect to CaCO;, from the start of spring turnover to the end of autumn turnover. Calcium (Ca' '') levels within the epilimnion decreased through much of the same period. Dissolution of CaCO:t in the hypolimnion is indicated by increases in Ca^' and alkalinity as stratification periods progress. Analysis of potentially influencing factors indicates that the seasonal trends were mostly a result of COj metabolism. This was further supported by concurrent algal biomass and "C uptake.
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