Effects of oligomerization and decomposition on the nanoparticle growth: a model study
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Published:2022-01-05
Issue:1
Volume:22
Page:155-171
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Heitto ArtoORCID, Lehtinen Kari, Petäjä TuukkaORCID, Lopez-Hilfiker Felipe, Thornton Joel A., Kulmala MarkkuORCID, Yli-Juuti Taina
Abstract
Abstract. The rate at which freshly formed secondary
aerosol particles grow is an important factor in determining their climate
impacts. The growth rate of atmospheric nanoparticles may be affected by
particle-phase oligomerization and decomposition of condensing organic
molecules. We used the Model for Oligomerization and Decomposition in
Nanoparticle Growth (MODNAG) to investigate the potential atmospheric
significance of these effects. This was done by conducting multiple
simulations with varying reaction-related parameters (volatilities of the
involved compounds and reaction rates) using both artificial and ambient
measured gas-phase concentrations of organic vapors to define the condensing
vapors. While our study does not aim at providing information on any
specific reaction, our results indicate that particle-phase reactions have
significant potential to affect the nanoparticle growth. In simulations
in which one-third of a volatility basis set bin was allowed to go through
particle-phase reactions, the maximum increase in growth rates was 71 % and the
decrease 26 % compared to the base case in which no particle-phase reactions were
assumed to take place. These results highlight the importance of
investigating and increasing our understanding of particle-phase reactions.
Funder
Academy of Finland Jane ja Aatos Erkon Säätiö H2020 European Research Council U.S. Department of Energy
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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