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

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...

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Autores principales: Paulson, Suzanne E., Gallimore, Peter J., Kuang, Xiaobi M., Chen, Jie Rou, Kalberer, Markus, Gonzalez, David H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6494489/
https://www.ncbi.nlm.nih.gov/pubmed/31049398
http://dx.doi.org/10.1126/sciadv.aav7689
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author Paulson, Suzanne E.
Gallimore, Peter J.
Kuang, Xiaobi M.
Chen, Jie Rou
Kalberer, Markus
Gonzalez, David H.
author_facet Paulson, Suzanne E.
Gallimore, Peter J.
Kuang, Xiaobi M.
Chen, Jie Rou
Kalberer, Markus
Gonzalez, David H.
author_sort Paulson, Suzanne E.
collection PubMed
description 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.
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spelling pubmed-64944892019-05-02 A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets Paulson, Suzanne E. Gallimore, Peter J. Kuang, Xiaobi M. Chen, Jie Rou Kalberer, Markus Gonzalez, David H. Sci Adv Research Articles 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. American Association for the Advancement of Science 2019-05-01 /pmc/articles/PMC6494489/ /pubmed/31049398 http://dx.doi.org/10.1126/sciadv.aav7689 Text en Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Paulson, Suzanne E.
Gallimore, Peter J.
Kuang, Xiaobi M.
Chen, Jie Rou
Kalberer, Markus
Gonzalez, David H.
A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title_full A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title_fullStr A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title_full_unstemmed A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title_short A light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
title_sort light-driven burst of hydroxyl radicals dominates oxidation chemistry in newly activated cloud droplets
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6494489/
https://www.ncbi.nlm.nih.gov/pubmed/31049398
http://dx.doi.org/10.1126/sciadv.aav7689
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