english:

The approach used by Pleim et al. (1984) to parameterize the deposition layer resistance terms is modified to include Slinn's (1982) estimate for the inertial impaction term.  The resulting deposition layer resistance is:

where,    Sc   =the Schmidt number (Sc = υ/DB) (dimensionless),

υ    =the viscosity of air (_ 0.15 cm2/s),

DB   =the Brownian diffusivity (cm2/s) of the pollutant in air,

St   =the Stokes number [St = (vg/g)(u*2 /υ)] (dimensionless),

g    =the acceleration due to gravity (981 cm/s2),

The gravitational settling velocity, vg (cm/s), is calculated as:

where,    ρ    =the particle density (g/cm3),

ρAIR  =the air density (_ 1.2 x 10-3 g/cm3),

dp   =the particle diameter (μm),

μ    =the absolute viscosity of air (_ 1.81 x 10-4 g/cm/s),

c2   =air units conversion constant (1 x 10-8 cm2/μm2), and

SCF   =the slip correction factor, which is computed as:

and, x2, a1, a2, a3 are constants with values of 6.5 x 10-6, 1.257, 0.4, and 0.55 x 10-4, respectively.

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