Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9721-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-9721-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Jul 2026
Research article |
| 10 Jul 2026
| 10 Jul 2026
The importance of aerosol and droplet microphysics for the properties and life cycle of radiation fog in the Po Valley
Hao Ding
CORRESPONDING AUTHOR
Department of Meteorology, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm, Sweden
Almuth Neuberger
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Rahul Ranjan
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Fredrik Mattsson
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Liine Heikkinen
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Karam Mansour
Institute of Atmospheric Science and Climate, National Research Council of Italy, Bologna, Italy
Stefano Decesari
Institute of Atmospheric Science and Climate, National Research Council of Italy, Bologna, Italy
Claudia Mohr
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
now at: Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland
now at: Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
Alejandro Baró Pérez
Department of Meteorology, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm, Sweden
Nazario Mastroianni
Department of Meteorology, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Paul Zieger
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Ilona Riipinen
Bolin Centre for Climate Research, Stockholm, Sweden
Department of Environmental Science, Stockholm University, Stockholm, Sweden
Annica M. L. Ekman
CORRESPONDING AUTHOR
Department of Meteorology, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm, Sweden
Data sets
The fog and aerosol interaction research Italy (FAIRARI) campaign, November 2021 to May 2022 Almuth Neuberger et al. https://doi.org/10.17043/fairari-2021-2022-3
Large-eddy simulation of droplet and aerosol microphysics role in radiation fog from FAIRARI campaign, Po Valley, February 2022 Hao Ding et al. https://doi.org/10.17043/fairari-2021-2022-les2-1
Model code and software
MIMICA LES model v5 Julien Savre et al. https://bitbucket.org/matthiasbrakebusch/mimicav5/src/master
Short summary
Fog poses numerous risks to society, yet it remains challenging to forecast. We use detailed numerical simulations based on fog observations in the Po Valley, Italy, to demonstrate that high concentrations of aerosol particles, as in polluted air, lead to an increase in droplet number, prolonged fog duration, and reduced visibility. The simulations also show the importance of accurately representing haze particles and the shape of the droplet size distribution for improved fog prediction.
Fog poses numerous risks to society, yet it remains challenging to forecast. We use detailed...
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