Chemical mechanism - SAPRC

Carter, W. P. L. Documentation of the SAPRC-99 chemical mechanism for VOC reactivity assessment. Report to the California Air Resources Board, Contracts 92-329 and 95-308, May 8 (2000). Available at http //www.certucr.edU/ carter/absts.htm saprc99. 

Carter, W. P. L. Evaluation of the SAPRC-99 Chemical Mechanism using new environmental chamber data. Presented at the Qordon Conference on Atmospheric Chemistry, Big Sky Resort, Montana, September 7-12, 2003 (available from http //pah.cert.ucr.edu/ carter/bycarter.htm)... 

Environmental chambers, Atmospheric chemical mechanisms, Ozone, Aromatic Hydrocarbons, Petroleum Distillates, Coatings VOCs SAPRC-99 Mechanism... 

There are a large number of condensed chemical reaction mechanisms to describe and represent atmospheric chemical transformations involving air pollutants. On the contrary only a very limited number of mechanisms exist with a detailed description of chemical transformation processes for primary and secondary atmospheric species. The Master Chemical Mechanism (MCM) (Jenkin et al, 1997) and SAPRC (Carter and Liumann, 1991) are two well known examples. 

Carter W. P. L. Documentation of the SAPRC-99 Chemical Mechanism for VOC reactivity Assessment, Final Report to California Air Resources Board Contract 92-329 and Contract 95-308, Air Pollution Research Center and College of Engineering Center for Environmental Research and Technology University of California Riverside, California (2000). 

Carter, W.P.L. (2000), Development and evaluation of the SAPRC-99 chemical mechanism. United States Environmental Protection Agency, Research and Development, (EPA/6(X)/R-00/076, Proceedings Sixth US/Germany Workshop on Ozone/Fine Particle Science, 1999), 19-41. 

As with previous assessments (e.g. Carter, 2000), the quantity D(Oj-NO) was used as the main criterion of model performance. This quantity is defined as D(03-NO)t = [Oajt -[NO]t - ([Osjo - PMO]o), where [03]o [NO]o, and [Osh, [NO]t are the concentrations of O3 and NO at the beginning of the run, and at time t , respectively. As described in detail previously (e.g., Carter and Lurmann, 1991, Carter et al, 1995a, Carter, 2000), D(Os-NO) is an indicator of the ability of the mechanism to simulate the chemical processes fliat cause O3 formation, giving a useful measure, even when O3 is suppressed by the presence of excess NO. In addition, use of this measure allows a direct comparison wifli die SAPRC-99 published results. The precursor decay rate and formation of die carbonyl products and PAN were also used as criteria of model praformance. 

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