Albedo over the boreal forest

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Read Full Article Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. D24, PAGES 28,901–28,909, 1997 Albedo over the boreal forest Alan K. Betts Atmospheric Research, Pittsford, Vermont John H. Ball Atmospheric Research, Pittsford, Vermont Abstract Using the Boreal Ecosystem-Atmosphere Study mesonet data, we show the annual cycle of albedo for 1994 and 1995 at 10 sites; two over grass, one over an aspen forest, and an average of seven over coniferous forests. Representative daily average albedo values in summer are 0.2 over grass, 0.15 for aspen, and 0.083 for the conifer sites. In winter the corresponding mean albedo for snow-covered grass, aspen, and conifer sites with snow under the canopy are 0.75, 0.21, and 0.13. The jack pine sites have a higher mean winter albedo of 0.15 than the predominantly spruce sites for which mean albedo is only 0.11. Forest albedo increases at all sites in winter (with snow on the ground under the canopy) as the ratio of diffuse to total solar flux increases. The albedo of the conifer sites in winter rarely reaches 0.3. Received 15 July 1996; accepted 11 December 1996. Read Full Article Cited by Citation: Betts, A. K., and J. H. Ball (1997), Albedo over the boreal forest, J. Geophys. Res., 102(D24), 28,901–28,909. Copyright 1997 by the American Geophysical Union.