Articles | Volume 20, issue 21
Atmos. Chem. Phys., 20, 12905–12920, 2020
https://doi.org/10.5194/acp-20-12905-2020

Special issue: The Aerosol Chemistry Model Intercomparison Project...

Atmos. Chem. Phys., 20, 12905–12920, 2020
https://doi.org/10.5194/acp-20-12905-2020

Research article 05 Nov 2020

Research article | 05 Nov 2020

Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP

David S. Stevenson et al.

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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AR: Author's response | RR: Referee report | ED: Editor decision
AR by David Stevenson on behalf of the Authors (31 Aug 2020)  Author's response    Manuscript
ED: Publish subject to technical corrections (15 Sep 2020) by Jennifer G. Murphy
AR by David Stevenson on behalf of the Authors (18 Sep 2020)  Author's response    Manuscript
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Short summary
We present historical trends in atmospheric oxidizing capacity (OC) since 1850 from the latest generation of global climate models and compare these with estimates from measurements. OC controls levels of many key reactive gases, including methane (CH4). We find small model trends up to 1980, then increases of about 9 % up to 2014, disagreeing with (uncertain) measurement-based trends. Major drivers of OC trends are emissions of CH4, NOx, and CO; these will be important for future CH4 trends.
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