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  Aerosol physicochemical effects on CCN activation simulated with the chemistry-climate model EMAC

Chang, D. Y., Lelieveld, J., Tost, H., Steil, B., Pozzer, A., & Yoon, J. (2017). Aerosol physicochemical effects on CCN activation simulated with the chemistry-climate model EMAC. Atmospheric Environment, 162, 127-140. doi:10.1016/j.atmosenv.2017.03.036.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-984A-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-984B-A
Genre: Journal Article

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 Creators:
Chang, D. Y.1, Author              
Lelieveld, J.1, Author              
Tost, H.2, Author
Steil, B.1, Author              
Pozzer, A.1, Author              
Yoon, J.2, Author
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, escidoc:1826285              
2external, escidoc:persistent22              

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 Abstract: This study uses the EMAC atmospheric chemistry-climate model to simulate cloud properties with a prognostic cloud droplet nucleation scheme. We present modeled global distributions of cloud condensation nuclei (CCN) number concentrations and CCN activation rates, together with the effective hygroscopicity parameter κ, to describe the aerosol chemical composition effect on CCN activation. Large particles can easily activate into cloud droplets, even at low κ values due to the dominant size effect in cloud droplet formation. Small particles are less efficiently activated as CCN, and are more sensitive to aerosol composition and supersaturation. Since the dominant fraction of small particles generally originates from anthropogenic precursor emissions over land, this study focuses on the influence of the continental atmosphere, using a prognostic cloud droplet nucleation scheme that considers aerosol-cloud interactions during cloud formation, together with a double-moment cloud microphysics scheme. The agreement of simulated clouds and climate with observations generally improves over the Northern Hemisphere continents, particularly high air pollution regions such as Eastern US, Europe, East Asia by accounting for aerosol-cloud interactions that include impacts of chemical composition on CCN activation.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
 Pages: -
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Title: Atmospheric Environment
Source Genre: Journal
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Publ. Info: Oxford [England] : Pergamon
Pages: - Volume / Issue: 162 Sequence Number: - Start / End Page: 127 - 140 Identifier: ISSN: 1352-2310
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/958480288336