Abstract
Relationships between the flux densities of sensible heat, water vapor and C02 and the appropriate gradients were examined systematically above and within a pine forest, 16–20 m high. Above the forest, the stability functions for heat and water vapor appeared to be identical, but different from those pertaining to smoother surfaces. Consequently, aerodynamic methods for calculating the flux densities of those scalars, which require exact knowledge of the stability functions, were unsuccessful, but the energy balance approach, which requires only that the functions be identical, still proved reliable. However, all gradient-diffusion schemes failed completely within the canopy, where counter-gradient or zero-gradient fluxes were observed for all three scalars. The failure of conventional flux-gradient relationships in that space is due in part to the sporadic penetration of transporting eddies into the canopy and their large scale.
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© 1985 D. Reidel Publishing Company
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Denmead, O.T., Bradley, E.F. (1985). Flux-Gradient Relationships in a Forest Canopy. In: Hutchison, B.A., Hicks, B.B. (eds) The Forest-Atmosphere Interaction. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5305-5_27
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DOI: https://doi.org/10.1007/978-94-009-5305-5_27
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8843-5
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