Surface albedo at a tower site in Lake Ontario |
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| Authors: | M Nunez J A Davies P J Robinson |
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| Institution: | (1) Dept. of Geography, Univ. of British Columbia, Vancouver, British Columbia, Canada;(2) Dept. of Geography, McMaster Univ., Hamilton, Ontario, Canada;(3) Dept. of Geography, Univ. of North Carolina, Chapel Hill, N.C., USA |
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| Abstract: | Measurements of incoming global, diffuse and reflected radiation at a tower site in Lake Ontario are used to evaluate components of surface albedo. Albedo for diffuse radiation lies between 0.074 and 0.082 and a coefficient for backscatter from sub-surface water layers shows little deviation from a mean of 0.017. Direct beam albedo for a calm surface follows the Fresnel law. Waves increase direct-beam albedo particularly at higher solar zenith angles. A pronounced dependence of albedo upon zenith angle for clear skies decreases with increasing cloud amount and becomes undetectable in overcast conditions. On a daily basis, albedo ranged between 0.07 in early July to 0.11 in mid-November. Day-to-day scatter is within ±1% of the mean seasonal trend. |
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