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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-508
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
14 Jul 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).
Theoretical analysis of mixing in liquid clouds. Part IV: DSD evolution and mixing diagrams
Mark Pinsky and Alexander Khain Department of Atmospheric Sciences, The Hebrew University of Jerusalem, Israel
Abstract. Evolution of droplet size distribution (DSD) due to mixing between cloudy and dry volumes is investigated for different values of the cloud fraction and different initial DSD shapes. The analysis is performed using a diffusion-evaporation model which describes time-dependent processes of turbulent diffusion and droplet evaporation within a mixing volume. Time evolution of the DSD characteristics such as droplet concentration, liquid water content, mean volume and the effective radii is analyzed. The mixing diagrams are plotted for the final mixing stages. It is shown that the difference between the mixing diagrams for homogeneous and inhomogeneous mixing is insignificant and decreases with an increase in the DSD width. The dependencies of normalized cube of the effective radius on the cloud fraction were compared with those on normalized droplet concentration and found to be quite different. In case the normalized droplet concentration is used, mixing diagrams do not show any significant dependency on relative humidity in the dry volume.

The main conclusion of the study is that traditional mixing diagrams cannot serve as a reliable tool in analysis of mixing type.


Citation: Pinsky, M. and Khain, A.: Theoretical analysis of mixing in liquid clouds. Part IV: DSD evolution and mixing diagrams, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-508, in review, 2017.
Mark Pinsky and Alexander Khain
Mark Pinsky and Alexander Khain
Mark Pinsky and Alexander Khain

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Short summary
It is shown that the difference between the mixing diagrams for homogeneous and inhomogeneous mixing is insignificant and decreases with an increase in the DSD width. In case the normalized droplet concentration is used, mixing diagrams do not show any significant dependency on relative humidity in the dry volume. The main conclusion of the study is that traditional mixing diagrams cannot serve as a reliable tool in analysis of mixing type.
It is shown that the difference between the mixing diagrams for homogeneous and inhomogeneous...
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