The Aitken mode aerosols are treated as interstitial aerosol

and are slowly absorbed into the cloud/rain water. An

assumption used is that organics influence neither the water

content nor the ionic strength of the system. Thus, in the

current release of CMAQ, only the equilibrium of the

sulfate, nitrate, ammonium, and water system is considered.

The equilibrium and associated constants are based upon

Kim et al. [106]. Refer to Binkowski and Roselle [91] and

Binkowski [107] for the details on the aerosol-phase

chemistry.

The wet deposition algorithms in CMAQ were taken from

the RADM. In the current implementation, deposition is

accumulated over 1-hour increments before being written to

the output file. The wet deposition amount of chemical

species i (wdepi) depends upon the precipitation rate (Pr)

and the cloud water concentration (mi

cld):

8.3 Aqueous-Phase Chemistry

The aqueous chemistry model evolved from the original

RADM (Chang et al. [10]). The model considers the

absorption of chemical compounds into the cloud water; the

amount that gas-phase species absorb into the cloud water

depends on thermodynamic equilibrium, while

accumulation-mode aerosols are considered to have been the

nucleation particles for cloud droplet formation and are

completely absorbed into the cloud water. Then the model

calculates the dissociation of compounds into ions, oxidation

of S(IV) to S(VI), and wet deposition. The species that

participate in the aqueous chemistry are given in Table 3.

This version of the aqueous chemistry model differs from

the Walcek and Taylor [105] scheme in that it tracks

contributions from gases and aerosols separately. It also

considers the scavenging of interstitial aerosols, and it

allows for variable-length cloud time scales.

 

 

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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