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numerical study on dry deposition processes in canopy layer

Advances in Atmospheric Sciences 1992年第4期9卷 491-500页

作者：雷孝恩 Julius S.Chang Institute of Atmospheric Physics Academia Sinica Beijing ASRC State University of New York Albany N.Y. 12205 U.S.A. coupling model between the canopy layer(CL) and atmospheric boundary layer (ABL) for the study of dry deposition velocity is developed. The model consists of six parts: chemical species conservation equation including absorptive factor the species uptake action including detailed vertical variation of absorptive element in CL momentum exchange in CL which is represented by a first-order closure momentum equation with an additional larger-scale diffusive term momentum exchange in ABL which is described by a complete set of the ABL turbulent statistic parameters absorptivity (or solubility or reflection) at the surface including effects of the physical and chemical characters of the species land type seasonal and diurnal variations of the meteorological variables and deposition velocity derived by distributions of the species with height in CL. Variational rules of the concentration and deposition velocity with both height and time are simulated with the model for both corn and forest canopies. Results predicted with the bulk deposition velocity derived in the paper consist well with experimental data.

A coupling model between the canopy layer(CL) and atmospheric boundary layer (ABL) for the study of dry deposition velocity is developed. The model consists of six parts: chemical species conservation equation including absorptive factor; the species uptake action including detailed vertical variation of absorptive element in CL; momentum exchange in CL which is represented by a first-order closure momentum equation with an additional larger-scale diffusive term; momentum exchange in ABL which is described by a complete set of the ABL turbulent statistic parameters; absorptivity (or solubility or reflection) at the surface including effects of the physical and chemical characters of the species, land type, seasonal and diurnal variations of the meteorological variables; and deposition velocity derived by distributions of the species with height in CL. Variational rules of the concentration and deposition velocity with both height and time are simulated with the model for both corn and forest canopies. Results predicted with the bulk deposition velocity derived in the paper consist well with experimental data.

关键词： numerical study on dry deposition processes in canopy layer

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