Articles | Volume 16, issue 19
Atmos. Chem. Phys., 16, 12477–12493, 2016
https://doi.org/10.5194/acp-16-12477-2016

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 16, 12477–12493, 2016
https://doi.org/10.5194/acp-16-12477-2016

Research article 05 Oct 2016

Research article | 05 Oct 2016

Global tropospheric hydroxyl distribution, budget and reactivity

Jos Lelieveld et al.

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Short summary
The self-cleaning capacity of the atmosphere is controlled by hydroxyl (OH) radicals in the troposphere. There are primary and secondary OH sources, the former through the photodissociation of ozone, the latter through OH recycling. We used a global model, showing that secondary sources are larger than assumed previously, which buffers OH. Complementary OH formation mechanisms in pristine and polluted environments, connected through transport of ozone, can maintain stable global OH levels.
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