Articles | Volume 17, issue 2
https://doi.org/10.5194/acp-17-1557-2017
https://doi.org/10.5194/acp-17-1557-2017
Research article
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31 Jan 2017
Research article | Highlight paper |  | 31 Jan 2017

Halogen chemistry reduces tropospheric O3 radiative forcing

Tomás Sherwen, Mat J. Evans, Lucy J. Carpenter, Johan A. Schmidt, and Loretta J. Mickley

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Tomás Sherwen on behalf of the Authors (23 Dec 2016)  Author's response   Manuscript 
ED: Referee Nomination & Report Request started (29 Dec 2016) by Jason West
RR by Anonymous Referee #1 (03 Jan 2017)
ED: Publish as is (03 Jan 2017) by Jason West
AR by Tomás Sherwen on behalf of the Authors (12 Jan 2017)
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Short summary
We model pre-industrial to present day changes using the GEOS-Chem global chemical transport model with halogens (Cl, Br, I). The model better captures pre-industrial O3 observations with halogens included. Halogens buffer the tropospheric forcing of O3 (RFTO3) from pre-industrial to present day, reducing RFTO3 by 0.087 Wm−2. This reduction is greater than that from halogens on stratospheric O3 (−0.05 Wm−2). This suggests that models that do not include halogens will overestimate RFTO3by ~ 25%.
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