Atmos. Chem. Phys. Discuss., 8, 15665-15698, 2008
www.atmos-chem-phys-discuss.net/8/15665/2008/
doi:10.5194/acpd-8-15665-2008
© Author(s) 2008. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Parameterizing the competition between homogeneous and heterogeneous freezing in cirrus cloud formation – monodisperse ice nuclei
D. Barahona1 and A. Nenes1,2
1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, USA
2School of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA

Abstract. We present a parameterization of cirrus cloud formation that computes the ice crystal number and size distribution under the presence of homogeneous and heterogeneous freezing. The parameterization is very simple to apply and is derived from the analytical solution of the cloud parcel equations, assuming that the ice nuclei population is monodisperse and chemically homogeneous. In addition to the ice distribution, an analytical expression is provided for the limiting ice nuclei number concentration that suppresses ice formation from homogeneous freezing. The parameterization is evaluated against a detailed numerical parcel model, and reproduces numerical simulations over a wide range of conditions with an average error of 6±33%.

Citation: Barahona, D. and Nenes, A.: Parameterizing the competition between homogeneous and heterogeneous freezing in cirrus cloud formation – monodisperse ice nuclei, Atmos. Chem. Phys. Discuss., 8, 15665-15698, doi:10.5194/acpd-8-15665-2008, 2008.
 
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