Scalar Concentration Profiles in the Canopy and Roughness Sublayer

被引：86

作者：

Harman, Ian N. ^{[1
]}

Finnigan, John J. ^{[1
]}

机构：

[1] CSIRO Marine & Atmospher Res, FC Pye Lab, Canberra, ACT, Australia

来源：

BOUNDARY-LAYER METEOROLOGY | 2008年 / 129卷 / 03期

基金：

英国自然环境研究理事会;

关键词：

Canopy; Monin-Obukhov Similarity Theory; Numerical weather prediction; Roughness Sublayer; Scalar profile; Stability;

D O I：

10.1007/s10546-008-9328-4

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

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.

引用

页码：323 / 351

页数：29

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