Summer Energy Balance Regimes for Alpine Tundra, Plateau Mountain, Alberta, Canada

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Abstract
Measurements of the components of the surface energy balance made at an apline tundra site in the southern Rocky Mountains of Alberta, Canada, during the summer of 1985 are reported. The Bowen ratio-energy balance approach was used to determine sensible and latent heat flux densities. Eddy correlation and Ohm''s law analog determinations of sensible heat flux were used to confirm the Bowen ratio measurements. The latent heat flux density data was used in conjunction with the combination model to quantitatively describe the surface''s resistance to water efflux. Daylight period net radiation flux density averaged 14.1 MJ m-2. Daylight period and half-hour soil heat flux densities were consistently 10 to 15% of net radiation. Latent heat fluc densities were limited to varying degrees by surface moisture availability throughout the experiment. Surface resistance calculations showed that the surface exercised a dynamic and variable influence on the energy balance regime through the control of surface moisture availability.

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