Thanks are due to Drs. R. Spronken-Smith and S. Grimmond for assistance with the field observations. Drs. S. Grimmond and M. Roth provided helpful suggestions regarding the surface energy balance calculations. The AGEMA scanner was made available by the Ontario Laser and Lightwave Research Centre. P. Chalk assisted with the preparation of the figures. This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Atmospheric Environment Service of Environment Canada.
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