DEVELOPMENT OF REVISED SAPRC AROMATICS MECHANISMS

Results
Table 11 gives a summary of the average performance metrics for the simulations of the aromatic
- NO x experiments with the updated aromatics mechanisms, with results shown for all compounds for
SAPRC-11, the standard version of the mechanism, and shown also shown for SAPRC-11A for the four
compounds where the additional NO x dependence incorporated in this version is necessary to fit the data
over the full range of NO x levels. Average model errors are shown graphically, and compared between
SAPRC-07 and SAPRC-11 on Figure 5 for all 17 aromatic compounds, and compared between SAPRC-
11A and SAPRC-11 on Figure 6 for the four compounds where SAPRC-11A had to be used to fit the data
over the full NO x concentration range. Table 11 gives the average biases and errors for the various
metrics, where the biases are the averages of the model errors for the various runs and the errors are the
averages of the absolute magnitudes of the model errors. The number of runs used for computing the
Table 11. Average model performance metrics for SAPRC-11 model simulations of the aromatic -
NO x chamber experiments.
Compound
∆([O 3 ]-[NO]) formation rate
Maximum Integrated
[NO x ]