Use of measured data - All sources of air quality data for a
particular modeling domain should be evaluated for applicability in
establishing initial and boundary conditions. Unfortunately, most
ongoing monitoring programs have been designed (understandably so)
with a receptor-based orientation. While available monitoring data
are useful for evaluating model performance, they usually are not
adequate for establishing initial and boundary concentrations.
To develop initial and boundary conditions, it is recommended
that one or more monitoring stations be sited upwind of the
central urban area along prevailing wind trajectories that
give rise to ozone exceedances.
The sampling and analysis program should provide data to
calculate hourly values for ozone, NO, NO2, and speciated
At the inflow boundaries, air quality data at the surface and
aloft should be used whenever available to specify the
boundary conditions. Default values (Table 2) may be used
Use of default values - Some urban areas may lack adequate
data suitable for establishing initial and boundary conditions.
Section 3.2 on domain selection and Chapter 4 on diagnostic
analyses recommend constructing domains and simulation periods
large enough to minimize the sensitivity of inner core and downwind
concentrations to assumed initial and boundary conditions.
n1101 - n1102 - n1103 - n1104 - n1105 - n1106 - n1107 - n1108 - n1109 - n1110 - n1111 - n1112 - n1113 - n1114 - n1115 - n1116 - n1117 - n1118 - n1119 - n1120 - n1121 - n1122 - n1123 - n1124 - n1125 - n1126 - n1127 - n1128 - n1129 - n1130 - n1131 - n1132 - n1133 - n1134 - n1135 - n1136 - n1137 - n1138 - n1139 - n1140 - n1141 - n1142 - n1143 - n1144 - n1145 - n1146 - n1147 - n1148 - n1149 - n1150
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castellano: DIS CUS DES RAD english: DIS CUS DES RAD
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