Impact of a new condensed toluene mechanism on air quality model predictions in the US

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Abstract

A new condensed toluene mechanism is incorporated into the CommunityMultiscale Air Quality Modeling system. Model simulations are performedusing the CB05 chemical mechanism containing the existing (base) and the newtoluene mechanism for the western and eastern US for a summer month. Withcurrent estimates of tropospheric emission burden, the new toluene mechanismincreases monthly mean daily maximum 8-h ozone by 1. 0ĝ€"3.0 ppbv in LosAngeles, Portland, Seattle, Chicago, Cleveland, northeastern US, and Detroitcompared to that with the base toluene chemistry. It reduces model mean biasfor ozone at elevated observed ozone concentrations. While the new mechanismincreases predicted ozone, it does not enhance ozone production efficiency.A sensitivity study suggests that it can further enhance ozone if elevatedtoluene emissions are present. While it increases in-cloud secondary organicaerosol substantially, its impact on total fine particle mass concentrationis small. © 2011 Author(s) CC Attribution 3.0 License.

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Sarwar, G., Appel, K. W., Carlton, A. G., Mathur, R., Schere, K., Zhang, R., & Majeed, M. A. (2011). Impact of a new condensed toluene mechanism on air quality model predictions in the US. Geoscientific Model Development, 4(1), 183–193. https://doi.org/10.5194/gmd-4-183-2011

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