Ivatt, Peter David, Evans, Mathew John orcid.org/0000-0003-4775-032X and Lewis, Alastair orcid.org/0000-0002-4075-3651 (2022) Suppression of surface ozone by an aerosol-inhibited photochemical ozone regime. Nature Geoscience. pp. 536-540. ISSN 1752-0908
Abstract
Atmospheric ozone (O3) is a pollutant produced through chemical chain reactions where volatile organic compounds (VOCs), carbon monoxide and methane are oxidized in the presence of oxides of nitrogen (NOx). For decades, the controlling chain termination step has been used to separate regions into either ‘NOx limited’ (peroxyl-radical self-reactions dominate) or ‘VOC limited’ (hydroxyl radical (OH) + nitrogen dioxide (NO2) reaction dominates). The controlling regime would then guide poli- cies for reducing emissions and so O3 concentrations. Using a chemical transport model, we show that a third ‘aerosol inhib- ited’ regime exists, where reactive uptake of hydroperoxyl radicals (HO2) onto aerosol particles dominates. In 1970, 2% of the Northern Hemisphere population lived in an aerosol-inhibited regime, but by 2014 this had increased to 21%; 60% more than lived in a VOC-limited regime. Aerosol-inhibited chemistry suppressed surface O3 concentrations in North America and Europe in the 1970s and is currently suppressing surface O3 over Asia. This third photochemical O3 regime leads to potential trade-off tensions between reducing particle pollution in Asia (a key current health policy and priority) and increasing surface O3, should O3 precursors emissions not be reduced in tandem.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © The Author(s) 2022 |
Dates: |
|
Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) |
Funding Information: | Funder Grant number NATURAL ENVIRONMENT RESEARCH COUNCIL NE/R017549/1 |
Depositing User: | Pure (York) |
Date Deposited: | 11 Jul 2022 13:50 |
Last Modified: | 21 Jan 2025 18:03 |
Published Version: | https://doi.org/10.1038/s41561-022-00972-9 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1038/s41561-022-00972-9 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188842 |