3.1 Episode Selection

A major component of the Modeling Protocol is selection of

meteorological episodes. In general, episode selection involves a

review (described below) of several multiday periods during which

high ozone was monitored. At least 1 day is chosen as the day of

primary interest for each selected episode. Model simulations

typically begin at least one day prior to the day of primary

interest. This minimizes the effects of assumed initial conditions

on predicted concentrations for the critical day. The length of a

modeled episode is generally a minimum of 48 hours, and the last

day in this period--the day of primary interest--is referred to as

the "primary day."

Episodes that have a high probability of covering different

sets of meteorological conditions corresponding with high ozone

concentrations should be modeled. Clearly, a trained meteorologist

familiar with local and regional weather patterns should be

consulted in the selection process. Conditions resulting in

distinctly different source-receptor configurations should be the

prime consideration in distinguishing different meteorological

regimes. Generally, conditions reflecting both poorly defined wind

flow (stagnation) and better defined flow (transport) will need to

be included. It is important to coordinate episode selection with

those responsible for Modeling Protocols in nearby domains,

particularly when observed exceedances may result from

"overwhelming transport."7

The following approach is recommended for selecting episode

days for use in modeling:

1. Identify the meteorological regimes associated with highozone

episodes. The procedure recommended for

identifying meteorological regimes is described in

Appendix B.

2. Select candidate episode days for modeling from the

period from 1987 to the present time. Place each

candidate episode day in the appropriate meteorological

regime (see Appendix B).



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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