. 2015 Jun 19;7(2):865–914. doi: 10.1002/2014MS000421

Table A12.

Summary of Dry Deposition Parameterization^a

Item

Formula

Parameter Settings

Dry deposition velocity,

V_{d}

V_{d} = V_{g}_S + \frac{1}{R_{a} + R_{s}}

V_{g}_S = V_{g} (s u r f a c e l a y e r),

sedimentation velocity at surface layer

Aerodynamic resistance,

R_{a}

R_{a} = \int_{z_{0}}^{z_{r}} \frac{ψ (z)}{κ μ_{*} z} d z

, for ocean/sea ice;

R_{a}

for land from CESM1 Land model

\begin{matrix} z_{r}, center of model bottom layer; \\ z_{0} = {\begin{matrix} 0.001, o c e a n \\ 0.04, s e a i c e \end{matrix}, r o u g h n e s s l e n g t h; \end{matrix}

κ=0.4, Von Karman constant;μ*, friction velocity;ψ, stable function

Surface layer resistance,

R_{s}

R_{s} = \frac{1}{ε_{0} μ_{*} R_{1} (E_{B} + E_{I M} + E_{I N})}

R_{1} = 1,

fraction of particles that stick to the surface;

ε_{0} = 3,

empirical constant

Brownian diffusion collection efficiency,

E_{B}

E_{B} = {\begin{matrix} S c^{- 0.5}, o c e a n \\ S c^{- 2 / 3}, l a n d \end{matrix}

S c = \frac{v_{a}}{D_{B}}, Schmidt nNumber

;

v_{a}

, Kinetic air viscosity;

D_{B}

, Brownian diffusivity

Impaction collection efficiency,

E_{I M}

E_{I M} = {(\frac{S t}{S t + 0.8})}^{2}

S t = \frac{V_{g}_{S} * u_{*}^{2}}{g v_{a}}

, Stoke number

Interception efficiency,

E_{I N}

E_{I N} = c [F (\frac{r}{r + A 1}) + (1 - F) (\frac{r}{r + A 2})]

\begin{matrix} A 1 = 1. e^{- 3} cm; \\ A 2 = 1. e^{- 1} cm; \\ F = 1 %; \\ c = 1 / 3 \end{matrix}