A new diagnostic for tropospheric ozone production

Peter M. Edwards*, Mathew J. Evans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Tropospheric ozone is important for the Earth's climate and air quality. It is produced during the oxidation of organics in the presence of nitrogen oxides. Due to the range of organic species emitted and the chain-like nature of their oxidation, this chemistry is complex and understanding the role of different processes (emission, deposition, chemistry) is difficult. We demonstrate a new methodology for diagnosing ozone production based on the processing of bonds contained within emitted molecules, the fate of which is determined by the conservation of spin of the bonding electrons. Using this methodology to diagnose ozone production in the GEOS-Chem chemical transport model, we demonstrate its advantages over the standard diagnostic. We show that the number of bonds emitted, their chemistry and lifetime, and feedbacks on OH are all important in determining the ozone production within the model and its sensitivity to changes. This insight may allow future model-model comparisons to better identify the root causes of model differences.

Original languageEnglish
Pages (from-to)13669-13680
Number of pages12
JournalAtmospheric Chemistry and Physics
Issue number22
Publication statusPublished - 17 Nov 2017

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© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

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