期刊
BOUNDARY-LAYER METEOROLOGY
卷 129, 期 3, 页码 323-351出版社
SPRINGER
DOI: 10.1007/s10546-008-9328-4
关键词
Canopy; Monin-Obukhov Similarity Theory; Numerical weather prediction; Roughness Sublayer; Scalar profile; Stability
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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