Articles | Volume 19, issue 10
https://doi.org/10.5194/amt-19-3363-2026
© 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/amt-19-3363-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 May 2026
Research article |
| 26 May 2026
| 26 May 2026
Calibrating interdependent photochemistry, nucleation, and aerosol microphysics in chamber experiments
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Victoria Hofbauer
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Henning Finkenzeller
Atmospheric and Oceanic Sciences, University of Colorado, Boulder, P.O. Box 311, Boulder, CO 80309 USA
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Dominik Stolzenburg
Faculty of Physics, University of Vienna, Vienna, Austria
Institute of Materials Chemistry, TU Wien, Vienna, Austria
Paulus S. Bauer
Faculty of Physics, University of Vienna, Vienna, Austria
Randall Chiu
Atmospheric and Oceanic Sciences, University of Colorado, Boulder, P.O. Box 311, Boulder, CO 80309 USA
Lubna Dada
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Jonathan Duplissy
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Xu-Cheng He
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
Martin Heinritzi
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Christopher R. Hoyle
Center for Energy and Environmental Sciences, Paul Scherrer Institute, 5232 Villigen, Switzerland
Andreas Kürten
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Aleksandr Kvashnin
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
Katrianne Lehtipalo
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Naser Mahfouz
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Vladimir Makhmutov
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
Moscow Institute of Physics and Technology, National Research University, 141701 Moscow, Russia
Roy L. Mauldin III
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Atmospheric and Oceanic Sciences, University of Colorado, Boulder, P.O. Box 311, Boulder, CO 80309 USA
Ugo Molteni
Center for Energy and Environmental Sciences, Paul Scherrer Institute, 5232 Villigen, Switzerland
Lauriane L. J. Quéléver
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Matti Rissanen
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Tampere University, Physics Unit, 33720 Tampere, Finland
Siegfried Schobesberger
Department of Technical Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
Mario Simon
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Andrea C. Wagner
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Mingyi Wang
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Department of the Geophysical Sciences, University of Chicago, Chicago, IL, USA
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Penglin Ye
Aerodyne Inc, Billerica MA, USA
Ilona Riipinen
Department of Environmental Science (ACES), Stockholm University, Stockholm, Sweden
Hamish Gordon
Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
Joachim Curtius
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Armin Hansel
Ion Molecule Reactions & Environmental Physics Group, Institute of Ion Physics and Applied Physics, Leopold-Franzens University, Innsbruck Technikerstraße 25, 6020 Innsbruck, Austria
Imad El Haddad
Center for Energy and Environmental Sciences, Paul Scherrer Institute, 5232 Villigen, Switzerland
Markku Kulmala
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Douglas R. Worsnop
Aerodyne Inc, Billerica MA, USA
Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
Rainer Volkamer
Atmospheric and Oceanic Sciences, University of Colorado, Boulder, P.O. Box 311, Boulder, CO 80309 USA
Paul M. Winkler
Faculty of Physics, University of Vienna, Vienna, Austria
Jasper Kirkby
CERN, the European Organization for Nuclear Research, Geneve 23 1211, Switzerland
Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
Richard Flagan
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
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Short summary
We describe accurate measurement of particle formation and growth in the CERN CLOUD (European Council for Nuclear Research Cosmics Leaving OUtdoor Droplets) chamber, using a suite of gas- and particle-phase instruments. The interconnected measurements establish high accuracy in key particle properties and critically important gas-phase sulfuric acid. This is a template for accurate calibration of similar experiments and thus accurate determination of aerosol nucleation and growth rates, which are an important source of uncertainty in climate science.
We describe accurate measurement of particle formation and growth in the CERN CLOUD (European...
