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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 5 | Copyright

Special issue: BACCHUS – Impact of Biogenic versus Anthropogenic emissions...

Atmos. Chem. Phys., 14, 2289-2302, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 04 Mar 2014

Research article | 04 Mar 2014

A parameterisation for the activation of cloud drops including the effects of semi-volatile organics

P. J. Connolly1, D. O. Topping1, F. Malavelle2, and G. McFiggans1 P. J. Connolly et al.
  • 1School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester, UK
  • 2College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK

Abstract. We present a parameterisation of aerosol activation, including co-condensation of semi-volatile organics, for warm clouds that has applications in large-scale numerical models. The scheme is based on previously developed parameterisations that are in the literature, but has two main modifications. The first is that the total aerosol mass is modified by the condensation of organic vapours entering cloud base, whereas the second is that this addition of mass acts to modify the median diameter and the geometric standard deviation of the aerosol size distribution. It is found that the scheme is consistent with parcel model calculations of co-condensation under different regimes. Such a parameterisation may find use in evaluating important feedbacks in climate models.

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