Abstract
Atmospheric coarse particles model has been evaluated by the dry deposition flux data collected simultaneously on the top and bottom surfaces of a smooth plate with a sharp leading edge that was pointed into the wind by a wind vane. The airborne concentration of coarse particles was measured with a Noll Rotary Impactor. Metals were analyzed by atomic absorption spectrophotometer together with graphite furnace device. Calculation using coarse particle model shown realistic estimates can be made for the total dry deposition flux and results are extremely sensitive to the mass of large particles. The results in this paper demonstrate that coarse particles dry deposition flux is responsible for greater than 90% of the modeled flux for particle size greater than 10 μm. Large particles control dry deposition flux is due to their high deposition velocities. Coarse particles dry deposition model over predicts elements (Pb, Cu Zn, Cd,) in upward fluxes and underestimate elements (Zn and Cd) in downward fluxes. For elements Mn and Fe, this model is overestimate in both upward and downward fluxes.
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