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Concentration profiles of particles settling in the neutral and stratified atmospheric boundary layer |
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| Authors: | Marcelo Chamecki René van Hout Charles Meneveau Marc B. Parlange |
| Affiliation: | (1) Department of Geography and Environmental Engineering, Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, USA;(2) Faculty of Mechanical Engineering, Technion - IIT, Haifa, Israel;(3) Department of Mechanical Engineering, Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, USA;(4) School of Architecture, Civil, and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland |
| Abstract: | An expression for the vertical equilibrium concentration profile of heavy particles, including the effects of canopy on the eddy diffusivity as well as corrections for atmospheric stability, is proposed. This expression is validated against measurements of vertical concentration profiles of corn pollen above a corn field. The fitted theoretical profiles show that particle settling is correctly accounted for. The sensitivity to variations in the turbulent Schmidt number, settling velocity and stability corrections are explicitly characterized. The importance of independent measurements of the surface flux of pollen in future experiments is noted. |
| Keywords: | Atmospheric stability Corn pollen Equilibrium profiles Pollen concentration Settling velocity Suspended heavy particles |
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