Paris, 15 February 2016

Clouds reveal new particle formation process

In addition to precipitation, clouds influence the climate in various ways: they cover 70% of the Earth's surface and represent nearly 15% of the volume of the atmosphere. Scientists need to understand their underlying chemical and physical mechanisms in order to better integrate them into climate change models. An international team of researchers at the Laboratoire interuniversitaire des systèmes atmosphériques (CNRS/Université Paris-Est Créteil/Université Paris Diderot)1 and the Laboratoire chimie de l'environnement (CNRS/Aix-Marseille Université) thus demonstrated for the first time the role played by cloud droplets in the atmospheric transformation of volatile organic pollutants. Volatile organic compounds, in gaseous form, condensate in these droplets to form secondary organic aerosols, which are a mixture of gas and solid or liquid particles. This work is published on 15 February 2016 in Atmospheric Chemistry and Physics.


© LISA (CNRS/Université Paris-Est Créteil/Université Paris Diderot)

The CESAM simulation chamber.

sequence nuage

© LISA (CNRS/Université Paris-Est Créteil/Université Paris) Diderot)

The inside of the CESAM chamber during a cloud event.

To download the press release : CP cumulus


1 The laboratory is part of the Institut Pierre Simon Laplace.


Secondary Organic Aerosol formation from isoprene photooxidation during cloud condensation–evaporation cycles. L. Brégonzio-Rozier, C. Giorio, F. Siekmann, E. Pangui, S. B. Morales, B. Temime-Roussel, A. Gratien, V. Michoud, M. Cazaunau, H. L. DeWitt, A. Tapparo, A. Monod, and J.-F. Doussin. Atmospheric Chemistry and Physics, 15 february 2016. View web site


Researcher l Jean-François Doussin l T + 33 (0)1 45 17 15 85 l
CNRS press officer l Alexiane Agullo l T +33 (0)1 44 96 43 90 l


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