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Dynamics of CFCs in northern temperate lakes and adjacent groundwater
U.S. Geological Survey, Middleton, Wisconsin, USA
U.S. Geological Survey, Middleton, Wisconsin, USA
U.S. Geological Survey, Middleton, Wisconsin, USA
Three dimictic lakes and one meromictic lake in and near the Trout Lake, Wisconsin, watershed were sampled to determine the variation of chlorofluorocarbon (CFC) concentrations within the lakes. The lakes were sampled during stratified conditions, during fall turnover, and during ice cover. The results demonstrate a considerable variation in CFC concentrations and corresponding atmospheric mixing ratios in the lakes sampled, both with depth and season within a given lake, and across different lakes. CFC profiles and observed degradation were not related to the groundwater inflow rate and hence are likely the result of in-lake processes influenced by CFC degradation in the (lake) water column, CFC degradation in the lake-bed sediments, and gas exchange rates and the duration of turnover (turnover efficiency).
Received 7 October 2005; accepted 22 November 2006; published 21 April 2007.
Citation: (2007), Dynamics of CFCs in northern temperate lakes and adjacent groundwater, Water Resour. Res., 43, W04423, doi:10.1029/2005WR004647.
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