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CALPUFF and Postprocessors

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F.9 Hourly Ozone Data File (OZONE.DAT)<br />

If the MESOPUFF II or RIVAD/ARM3 chemical mechanism is used to simulate the chemical<br />

transformation of SO 2 6 SO = 4 <strong>and</strong> NO x 6 HNO 3 : NO − 3, estimates of background ambient ozone<br />

concentration levels are required to compute the hourly conversion rates. <strong>CALPUFF</strong> provides two<br />

options for the user to provide these data: (1) a single, typical background value appropriate for the<br />

modeling region, or (2) hourly ozone data from one or more ozone monitoring stations. The selection of<br />

Option 2 requires that a file called OZONE.DAT be created with the necessary data.<br />

OZONE.DAT is a sequential, formatted data file containing three types of records: single header record,<br />

time-invariant data records, <strong>and</strong> hourly ozone data records. A sample OZONE.DAT file is shown in<br />

Table F-35. The header record contains information on the number of stations in the data set, the time<br />

period of the data, <strong>and</strong> descriptive information regarding the file. The time-invariant records contain the<br />

coordinates of each of the ozone stations. The time-varying data consists of hourly ozone concentrations<br />

at each of the ozone stations.<br />

MAR 2006 – <strong>CALPUFF</strong><br />

F-176

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