Articles | Volume 23, issue 8
https://doi.org/10.5194/acp-23-4955-2023
https://doi.org/10.5194/acp-23-4955-2023
Research article
 | 
28 Apr 2023
Research article |  | 28 Apr 2023

Exploring the drivers of tropospheric hydroxyl radical trends in the Geophysical Fluid Dynamics Laboratory AM4.1 atmospheric chemistry–climate model

Glen Chua, Vaishali Naik, and Larry Wayne Horowitz

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Short summary
The hydroxyl radical (OH) is an atmospheric detergent, removing air pollutants and greenhouse gases like methane from the atmosphere. Thus, understanding how it is changing and responding to its various drivers is important for air quality and climate. We found that OH has increased by about 5 % globally from 1980 to 2014 in our model, mostly driven by increasing nitrogen oxide (NOx) emissions. This suggests potential climate tradeoffs from air quality policies solely targeting NOx emissions.
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