Abstract
Abstract Five years of wind observations taken by the research vessel C.C.G.S. Porte Dauphine on Lake Erie and Lake Ontario have been compared to simultaneous observations taken at land stations upwind of the ship. The resultant ratios of over-lake winds/over-land winds have been sorted by speed classes, conditions of atmospheric stability, and the length of the over-water fetch to assess the relative influence of each factor on the over-lake wind. The effect of changes in atmospheric stability as created by air-water temperature differences is shown quantitatively with results confirming that wind speeds increase over water during unstable conditions and decrease during stable conditions. It is also shown that these changes are greatest in low winds and least in high winds. An increase in the length of the over-water fetch up to about 25 mi. contributes to an increase in wind speeds during unstable conditions. Under very stable conditions the lake winds become lighter with longer fetches but the changes ...
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