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A Comparison of Chemical Mechanisms Using Tagged Ozone Production Potential (Topp) Analysis : Volume 15, Issue 8 (29/04/2015)

By Coates, J.

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Book Id: WPLBN0003981518
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: A Comparison of Chemical Mechanisms Using Tagged Ozone Production Potential (Topp) Analysis : Volume 15, Issue 8 (29/04/2015)  
Author: Coates, J.
Volume: Vol. 15, Issue 8
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Butler, T. M., & Coates, J. (2015). A Comparison of Chemical Mechanisms Using Tagged Ozone Production Potential (Topp) Analysis : Volume 15, Issue 8 (29/04/2015). Retrieved from

Description: Insititute for Advanced Sustainability Studies, Potsdam, Germany. Ground-level ozone is a secondary pollutant produced photochemically from reactions of NOx with peroxy radicals produced during VOC degradation. Chemical transport models use simplified representations of this complex gas-phase chemistry to predict O3 levels and inform emission control strategies. Accurate representation of O3 production chemistry is vital for effective predictions. In this study, VOC degradation chemistry in simplified mechanisms is compared to that in the near-explicit MCM mechanism using a boxmodel and by tagging all organic degradation products over multi-day runs, thus calculating the Tagged Ozone Production Potential (TOPP) for a selection of VOC representative of urban airmasses. Simplified mechanisms that aggregate VOC degradation products instead of aggregating emitted VOC produce comparable amounts of O3 from VOC degradation to the MCM. First day TOPP values are similar across mechanisms for most VOC, with larger discrepancies arising over the course of the model run. Aromatic and unsaturated aliphatic VOC have largest inter-mechanisms differences on the first day, while alkanes show largest differences on the second day. Simplified mechanisms break down VOC into smaller sized degradation products on the first day faster than the MCM impacting the total amount of O3 produced on subsequent days due to secondary chemistry.

A comparison of chemical mechanisms using Tagged Ozone Production Potential (TOPP) analysis

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