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Adsorptive uptake of water by semisolid secondary organic aerosols
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 23
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 8, 3063-3068 p.Article in journal (Refereed) Published
Abstract [en]

Aerosol climate effects are intimately tied to interactions with water. Here we combine hygroscopicity measurements with direct observations about the phase of secondary organic aerosol (SOA) particles to show that water uptake by slightly oxygenated SOA is an adsorption-dominated process under subsaturated conditions, where low solubility inhibits water uptake until the humidity is high enough for dissolution to occur. This reconciles reported discrepancies in previous hygroscopicity closure studies. We demonstrate that the difference in SOA hygroscopic behavior in subsaturated and supersaturated conditions can lead to an effect up to about 30% in the direct aerosol forcinghighlighting the need to implement correct descriptions of these processes in atmospheric models. Obtaining closure across the water saturation point is therefore a critical issue for accurate climate modeling.

Place, publisher, year, edition, pages
2015. Vol. 42, no 8, 3063-3068 p.
Keyword [en]
SOA, hygroscopicity, adsorption, solubility, aerosol
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-118286DOI: 10.1002/2015GL063142ISI: 000354560800063OAI: oai:DiVA.org:su-118286DiVA: diva2:824860
Available from: 2015-06-22 Created: 2015-06-15 Last updated: 2017-12-04Bibliographically approved

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Rastak, NargesRiipinen, Ilona
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