Evaluation of evaporation from Lake Ontario during IFYGL by a modified mass transfer equation

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Abstract
Daily evaporation from Lake Ontario during the International Field Year for the Great Lakes (April 1972 to March 1973) was computed by a modified mass transfer technique. Turbulent energy flux was calculated by using upwind land station data and the surface water temperature at 88 grid points on the lake. Wind speed and humidity at each grid point were determined through multiregression equations that take into account stability, fetch, and water temperature. Daily, monthly, and annual evaporation amounts obtained in this study are compared to amounts obtained by conventional mass transfer, energy balance, and terrestrial water budget methods. Discrepancies in the results of the various approaches are examined and discussed.