Smick—A scavenging model incorporating chemical kinetics

Wetfall chemistry studies around a large coal‐fired power plant in the southeastern United States

“…The small increase in NH4 + concentration observed in the target area could be associated with a liquid-phase SO2-SO4--oxidation mechanism involving NH3, such as that proposed by Scott and Hobbs [1967]. Test calculations using SMICK [Drewes and Hales, 1982] have shown that if fully effective and acting alone this mechanism would result in unreasonably high NH4 + concentrations and pH values and comparatively small SO4--concentrations. It is possible, however, that this mechanism or a similar one may be potentially effective in increasing NH4 + concentrations in the target area while not observably affecting sulfate or hydrogen ion.…”

PLUVIUS: a generalized one-dimensional model of reactive pollutant behavior, including dry deposition, precipitation formation, and wet removal. Second edition

“…The other component, the grid vertical velocity, is determined by the shape of the hypothetical orographic barrier shown in Figure 5 Subroutine HENRY (Table 5-13) computes the effective solubility parameter for S02' as described in Equations (68)-(71). The subroutine was borrowed directly from a previous code (Drewes and Hales;. FUNCTION SSAT (Table 5-14) computes the saturation vapor density with respect to ice, "and is needed to calculate the depositional growth rate for snow.…”

PLUVIUS: a generalized one-dimensional model of reactive pollutant behavior, including dry deposition, precipitation formation, and wet removal

“…GR 10/ N,DZ ,DT,OZl,DZN,EF (50) ,EFSQ 50 Class III subroutine HENRY is presented in Table 31. This subroutine was borrowed directly from a previous code [Drewes and Hales (1977)], and computes a solubility coefficient HPRIME for S02 in water, which is defined by the equation y = HPRIME c Here y denotes the mole fraction of S02 in the gas phase, and c is its equilibrium concentration (moles/cm 3 ) in water. Arguments in the call sequence are as follows: c mole fraction S02 in gas phase or concentration S02 (moles total dissolved s02/cm3) in water HEX acidity of water in moles/liter T temperature, oK P pressure, atmospheres…”