Scalar Concentration Profiles in the Canopy and Roughness Sublayer |
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| Authors: | Ian N Harman John J Finnigan |
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| Institution: | (1) CSIRO Marine and Atmospheric Research, FC Pye Laboratory, Canberra, Australia |
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| Abstract: | The mean flow and scalar concentration profiles within and above a tall canopy are well known to violate the standard boundary-layer
flux-gradient relationships. We present a theory for the scalar concentration profile that is comprised of a canopy exchange
model coupled to a modified surface-layer model. The coupling between the two components and the modifications to the surface-layer
profiles are formulated through the mixing-layer analogy for the flow at canopy top. This analogy provides an additional length
scale—the vorticity thickness—upon which the profiles depend and a set of criteria that allows a reduction in the empiricism
associated with earlier forms in the literature. Predictions of the mean scalar concentration profiles are shown to match
observations over a wide range of diabatic stabilities for both potential temperature and water vapour. |
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| Keywords: | Canopy Monin-Obukhov Similarity Theory Numerical weather prediction Roughness Sublayer Scalar profile Stability |
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