A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets

Paulson, Suzanne E. and Gallimore, Peter J. and Kuang, Xiaobi M. and Chen, Jie Rou and Kalberer, Markus and Gonzalez, David H.. (2019) A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets. SCIENCE ADVANCES, 5 (5). ARTNeaav7689.

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Official URL: https://edoc.unibas.ch/74514/

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Aerosol particles and their interactions with clouds are one of the most uncertain aspects of the climate system. Aerosol processing by clouds contributes to this uncertainty, altering size distributions, chemical composition, and radiative properties. Many changes are limited by the availability of hydroxyl radicals in the droplets. We suggest an unrecognized potentially substantial source of OH formation in cloud droplets. During the first few minutes following cloud droplet formation, the material in aerosols produces a near-UV light-dependent burst of hydroxyl radicals, resulting in concentrations of 0.1 to 3.5 micromolar aqueous OH ([OH](aq)). The source of this burst is previously unrecognized chemistry between iron(II) and peracids. The contribution of the "OH burst" to total OH in droplets varies widely, but it ranges up to a factor of 5 larger than previously known sources. Thus, this new process will substantially enhance the impact of clouds on aerosol properties.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Atmospheric Sciences (Kalberer)
UniBasel Contributors:Kalberer, Markus and Gallimore, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:21 Apr 2020 07:12
Deposited On:21 Apr 2020 07:12

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