CB4 mechanism

The CB4 mechanism is a lumped structure type that is the

fourth in a series of carbon-bond mechanisms, and differs

from its predecessors notably in the detail of the organic

compound representation. The version of the core CB4

mechanism used in the CMAQ system includes 36 species

and 93 reactions of which 12 are photolytic. It is based on

Gery et al. [76], but also includes several changes that have

been made to the CB4 since the original publication. In

1991, the rate constants for the formation and decomposition

of PAN were changed, and a termination reaction between

the XO2 operator and the HO2 radical was added.

Subsequently, termination reactions for the XO2N operator

were also added. An updated isoprene chemistry

mechanism based on the work of Carter and Atkinson [80,

81] was developed and incorporated in CB4 in 1996. The

conversion of gaseous sulfur dioxide to gaseous sulfuric

acid has also been added to the original mechanism. Finally,

the original CB4 mechanism used simple Arrhenius Law

rate constant forms that were derived from more complex

temperature- and pressure-dependent rate constant

expressions for some rate constants. Because the top of the

CMAQ domain usually extends to a height where pressure



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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