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The role of highly oxygenated organic molecules in the Boreal aerosol-cloud-climate system
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 222019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 4370Article in journal (Refereed) Published
Abstract [en]

Over Boreal regions, monoterpenes emitted from the forest are the main precursors for secondary organic aerosol (SOA) formation and the primary driver of the growth of new aerosol particles to climatically important cloud condensation nuclei (CCN). Autoxidation of monoterpenes leads to rapid formation of Highly Oxygenated organic Molecules (HOM). We have developed the first model with near-explicit representation of atmospheric new particle formation (NPF) and HOM formation. The model can reproduce the observed NPF, HOM gas-phase composition and SOA formation over the Boreal forest. During the spring, HOM SOA formation increases the CCN concentration by similar to 10 % and causes a direct aerosol radiative forcing of -0.10 W/m(2). In contrast, NPF reduces the number of CCN at updraft velocities < 0.2 m/s, and causes a direct aerosol radiative forcing of +0.15 W/m(2). Hence, while HOM SOA contributes to climate cooling, NPF can result in climate warming over the Boreal forest.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 4370
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-175049DOI: 10.1038/s41467-019-12338-8ISI: 000487585600031PubMedID: 31554809OAI: oai:DiVA.org:su-175049DiVA, id: diva2:1366324
Available from: 2019-10-29 Created: 2019-10-29 Last updated: 2019-10-29Bibliographically approved

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Ehn, MikaelOlenius, TinjaElm, JonasHyttinen, NooraRiipinen, Ilona
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