the condensation of semi-volatile compounds that are

produced from the gas-phase reactions of alkanes,

aromatics, cresols, and terpenes. Because of their volatility,


the semi-volatiles are also capable of evaporating from the

particle-phase back to the gas-phase when temperatures

increase. The SOA gas-particle partitioning model used in

CMAQ is based on the Secondary Organic Aerosol Model

(SORGAM) described by Schell et al. [100]. However, the

gas-phase chemistry yields and the saturation concentrations

of the semi-volatiles that are used in CMAQ are derived

from the following sources – Odum et al. [101] for

aromatics, Griffin et al. [102] for terpenes, and Strader et al.

[103] for alkanes and cresols. Finally, the CMAQ SOA

algorithm has been implemented in such a manner as to

distinguish between SOA produced from anthropogenic

versus biogenic sources.

The aerosol species predicted in the CCTM are mass

concentrations of Aitken and accumulation modes sulfate,

ammonium, nitrate, anthropogenic secondary organic

aerosol, biogenic secondary organic aerosol, elemental

carbon aerosol, respectively. For the coarse mode, the

CCTM provides concentrations of unspecified species

(anthropogenic aerosol, marine aerosol, and

soil derived

aerosol mass). Unspeciated number concentrations and

surface areas of the Aitken and accumulation modes,

respectively, are predicted as well as the mass

concentrations of water in Aitken and accumulation modes.

8.2 Cloud Module

The current subgrid cloud scheme in CMAQ was derived

from the diagnostic cloud model in RADM version 2.6

(Dennis et al. [104], Walcek and Taylor [105], Chang et al.

[10], [71]). The CMAQ cloud module includes

parameterizations for subgrid convective precipitating and

non-precipitating clouds and grid-scale resolved clouds. It

includes an aqueous chemistry model for sulfur, and

includes a simple mechanism for scavenging. The rate of

change in pollutant concentrations due to cloud processes is

given by


where subscripts




n1051 - n1052 - n1053 - n1054 - n1055 - n1056 - n1057 - n1058 - n1059 - n1060 - n1061 - n1062 - n1063 - n1064 - n1065 - n1066 - n1067 - n1068 - n1069 - n1070 - n1071 - n1072 - n1073 - n1074 - n1075 - n1076 - n1077 - n1078 - n1079 - n1080 - n1081 - n1082 - n1083 - n1084 - n1085 - n1086 - n1087 - n1088 - n1089 - n1090 - n1091 - n1092 - n1093 - n1094 - n1095 - n1096 - n1097 - n1098 - n1099 - n1100


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