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Key drivers of cloud response to surface-active organics
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 62019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 5214Article in journal (Refereed) Published
Abstract [en]

Aerosol-cloud interactions constitute the largest source of uncertainty in global radiative forcing estimates, hampering our understanding of climate evolution. Recent empirical evidence suggests surface tension depression by organic aerosol to significantly influence the formation of cloud droplets, and hence cloud optical properties. In climate models, however, surface tension of water is generally assumed when predicting cloud droplet concentrations. Here we show that the sensitivity of cloud microphysics, optical properties and shortwave radiative effects to the surface phase are dictated by an interplay between the aerosol particle size distribution, composition, water availability and atmospheric dynamics. We demonstrate that accounting for the surface phase becomes essential in clean environments in which ultrafine particle sources are present. Through detailed sensitivity analysis, quantitative constraints on the key drivers - aerosol particle number concentrations, organic fraction and fixed updraft velocity - are derived for instances of significant cloud microphysical susceptibilities to the surface phase.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 5214
National Category
Earth and Related Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-176503DOI: 10.1038/s41467-019-12982-0ISI: 000496922700004PubMedID: 31740670OAI: oai:DiVA.org:su-176503DiVA, id: diva2:1381318
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2020-01-24Bibliographically approved

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Lowe, Samuel J.Riipinen, Ilona
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