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Laboratory studies on dry deposition of submicron-size particles on coniferous foliage

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Abstract

The deposition of 0.03 Μm particles to an assembly of 10 spruce shoots and a synthetic juniper shoot was studied by electrochemical transfer under conditions of Re and Sc similarity at flow velocities corresponding to wind speeds of 0.1 to 3 m s−1.

The concept of representing transfer to needle-type foliage by that to cylinders in crossflow, with adjustment factors for angle of incidence and for mutual interference of cylinders (needles), however imprecise, appears to be sufficient to interpret the results. The transfer data follow approximately a Re1/2 relationship with respect to flow velocity and the mass transfer coefficient calculated for cylinders in crossflow with a ‘shelter factor’ of the order of 2, to account for reduction in transfer due to mutual interference of needles, can be expected to be a reasonable first approximation of the deposition velocity.

Applications of the results to forest stands show very little absorption by stands of limited extension; distances of the order of kilometers would be required to reduce airborne concentrations to 1/e of their initial value for aerosol with negligible sedimentation and inertial impaction.

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  1. Macdonald Campus of McGill University Ste., H9X 1CO, Anne-de-Bellevue, Que., Canada

    Peter H. Schuepp

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  1. Peter H. Schuepp
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Schuepp, P.H. Laboratory studies on dry deposition of submicron-size particles on coniferous foliage. Boundary-Layer Meteorol 24, 465–480 (1982). https://doi.org/10.1007/BF00120734

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