Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 3
Articles | Volume 26, issue 3
https://doi.org/10.5194/acp-26-1735-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-1735-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 3
Research article
 | 
03 Feb 2026
Research article |  | 03 Feb 2026

Cloud droplet number enhancement from co-condensing NH3, HNO3, and organic vapours: boreal case study

Yu Wang, Beiping Luo, Judith Kleinheins, Gang I. Chen, Liine Heikkinen, and Claudia Marcolli

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Short summary
Ubiquitous semi-volatile compounds can co-condense on aerosol particles with water vapour when relative humidity increases. Simulations of cloud formation at a boreal forest site with a cloud parcel model that accounts for non-ideal organic–inorganic interactions yield an enhancement of cloud droplet number concentration from co-condensing NH3, HNO3, and organics up to 44%, with strong sensitivities to volatility distributions, aerosol size distribution, and updraft velocity.
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