Evaluation of the chemistry transport model system KAMM/DRAIS, based on daytime ground-level ozone data

The main objective of this study was to estimate the reliability of the chemistry transport model KAMM/DRAIS to predict increased ozone concentrations near ground level. The evaluation was carried out on the basis of the ozone measurements collected during episodes of the TRACT, FLUMOB, and BERLIOZ experiments. The ozone data of all episodes have been evaluated for the time period between 10 UTC and 17 UTC. Hourly and half-hourly data as well as peak values have been compared. Scatter diagrams, including regression line, bias and correlation coefficient and cumulative frequency distributions, have been analysed. In 50% and 90% of all cases the absolute difference between the measured and simulated ozone values is less than 8 ppb and 20 ppb, respectively. A comparison of the statistical parameters from this study with those from other evaluations shows that the KAMM/DRAIS model provides comparable results, indicating a good performance of the model.