Ozone Data Integration for OTAG Quality Analysis and Evaluation Model Janja D. Husar and Rudolf B. Husar CAPITA, Center for Air Pollution Impact and trend.

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Ozone Data Integration for OTAG Quality Analysis and Evaluation Model Janja D. Husar and Rudolf B. Husar CAPITA, Center for Air Pollution Impact and trend Analysis Washington University St. Louis, Missouri

Abstract The Ozone Transport Assessment Group (OTAG) Air Quality Analysis Workgroup has conducted an extensive analysis of the spatial and temporal pattern of ozone, the relationship between ozone and transport, as well as a comparison of model simulations with data. Much of the analysis and model comparison has utilized an integrated ozone database. Ozone monitoring data from seven different data sources (AIRS; CASTNet; EMEFS, SCION; LADCO; Georgia; North Carolina) were acquired and prepared in a common format. Subsequently, the data were integrated and fused into a single database with common units as well as uniform geographic and temporal coding. The integrated data set was extensively quality controlled utilizing a variety of different methods. The resulting data set yielded ozone data between for over 600 urban, suburban and rural sites over the OTAG domain. All the raw and re-formatted air quality data were shared through the OTAG Air Quality Analysis website. The data sets were also specially prepared and supplied to the OTAG Modeling Workgroup for comparison with the OTAG UAM-V model output.

DESCRIPTION OF THE DATA SETS And Data Integration Air quality data for OTAG Air Quality Analysis and UAM-V Model evaluation has been collected from multiple sources:

Data quality notes for CASTNet Network

Data quality notes for EMEFS network

CASTNet Station CNM167, Chiricahua, AZ. An AIRS station in vicinity had a same spike of 135 ppb in the same time period. Thus, the CASTNet station O3 data for May 9, 1990, 4:00 were kept

CASTNet station EGB181 ozone data were displayed for 1995 only. The signal indicated measurement problem. Ozone data for CASTNet station EGB181 were removed from the fused data base

EMEFS station 08065b on June 22, :00, 11:00 and 12:00 displayed a spike. The co-located station 08065a displayed no spike in that time period. Thus, the station 08065b on June 22, :00, 11:00 and 12:00 readings were removed from the data set

The data set obtained by fusion contained ozone data between for over 600 urban, suburban and rural sites over the OTAG domain

The contour map of ozone data for for June, July, and August using the combined data set