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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. D24, PAGES 28,901–28,910, 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. © 1997 American Geophysical Union

Index Terms: 3309 Meteorology and Atmospheric Dynamics: Climatology (1620); 3359 Meteorology and Atmospheric Dynamics: Radiative processes; 1863 Hydrology: Snow and ice (1827); 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions.


Subscriber Access to Print Version (Nonsubscribers may purchase for $9.00) (2914486 bytes)

Citation: Betts, A. K., and J. H. Ball (1997), Albedo over the boreal forest, J. Geophys. Res., 102(D24), 28,901–28,910.