Articles | Volume 19, issue 19
Atmos. Chem. Phys., 19, 12397–12412, 2019
https://doi.org/10.5194/acp-19-12397-2019
Atmos. Chem. Phys., 19, 12397–12412, 2019
https://doi.org/10.5194/acp-19-12397-2019

Research article 08 Oct 2019

Research article | 08 Oct 2019

Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Nadine Borduas-Dedekind et al.

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Cited articles

Arangio, A. M., Tong, H., Socorro, J., Pöschl, U., and Shiraiwa, M.: Quantification of environmentally persistent free radicals and reactive oxygen species in atmospheric aerosol particles, Atmos. Chem. Phys., 16, 13105–13119, https://doi.org/10.5194/acp-16-13105-2016, 2016. 
Augustin, S., Wex, H., Niedermeier, D., Pummer, B., Grothe, H., Hartmann, S., Tomsche, L., Clauss, T., Voigtländer, J., Ignatius, K., and Stratmann, F.: Immersion freezing of birch pollen washing water, Atmos. Chem. Phys., 13, 10989–11003, https://doi.org/10.5194/acp-13-10989-2013, 2013. 
Axson, J. L., May, N. W., Colón-Bernal, I. D., Pratt, K. A., and Ault, A. P.: Lake spray aerosol: A chemical signature from individual ambient particles, Environ. Sci. Technol., 50, 9835–9845, https://doi.org/10.1021/acs.est.6b01661, 2016. 
Borduas-Dedekind, N.: Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals, ETH Zürich, https://doi.org/10.3929/ethz-b-000342107, 2019. 
Boreddy, S. K. R., Kawamura, K., and Tachibana, E.: Long-term (2001–2013) observations of water-soluble dicarboxylic acids and related compounds over the western North Pacific: trends, seasonality and source apportionment, Sci. Rep.-UK, 7, 8518, https://doi.org/10.1038/s41598-017-08745-w, 2017. 
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Short summary
During atmospheric transport, dissolved organic matter (DOM) within aqueous aerosols undergoes photochemistry. We find that photochemical processing of DOM increases its ability to form cloud droplets but decreases its ability to form ice crystals over a simulated 4.6 days in the atmosphere. A photomineralization mechanism involving the loss of organic carbon and the production of organic acids, CO and CO2 explains the observed changes and affects the liquid-water-to-ice ratio in clouds.
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