On gas fluxes from small lakes and ponds |
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| Authors: | Joyce Kwan Peter A Taylor |
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| Institution: | (1) Department of Earth and Atmospheric Science, York University, 4700 Keele Street, M 3J 1P3 North York, Ontario, Canada |
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| Abstract: | A semi-empirical model for estimating gas fluxes at the air-water interface in a neutrally stratified atmosphere is presented. Gas transfer velocity is assumed to depend on local friction velocity, whose variation with over-water fetch is estimated from Walmsleyet al.'s (1989)  Guidelines . As guidance for limnologists estimating CO2 and CH4 fluxes from lakes and ponds in the Hudson Bay Lowlands region, we present model results of the variation of gas transfer velocity with over-water fetch,k(x), for comparison with the customary constant valuek
0. Gas fluxes are estimated over well mixed, circular and elliptical lakes and ponds. The results of accounting for fetch dependence, wind direction, pond shapes and sizes lead to correction factors to fluxes obtained withk
0. Recent studies of gas transfer velocity for gases of low solubility from lakes are reviewed, and the problem of time averaging on quantities determined from experimental measurements is also discussed. |
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