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Title: Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams

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 for 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, LWC and mean volume 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 the normalized cube of the mean volume radius on the cloud fraction were compared with those on normalized droplet concentration and found to be quite different. If the normalized droplet concentration is used, mixing diagrams do not show any significant dependence on relative humidity in the dry volume. The main conclusion of the study is that traditional mixing diagrams cannot serve as a reliable tool for analysis of mixing type.

Authors:
 [1]; ORCiD logo [1]
  1. Hebrew Univ. of Jerusalem (Israel). Dept. of Atmospheric Sciences
Publication Date:
Research Org.:
Hebrew Univ. of Jerusalem (Israel)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); Israel Science Foundation
OSTI Identifier:
1502388
Grant/Contract Number:  
SC0006788; 1393/14; 2027/17
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES

Citation Formats

Pinsky, Mark, and Khain, Alexander. Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams. United States: N. p., 2018. Web. doi:10.5194/acp-18-3659-2018.
Pinsky, Mark, & Khain, Alexander. Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams. United States. doi:10.5194/acp-18-3659-2018.
Pinsky, Mark, and Khain, Alexander. Tue . "Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams". United States. doi:10.5194/acp-18-3659-2018. https://www.osti.gov/servlets/purl/1502388.
@article{osti_1502388,
title = {Theoretical analysis of mixing in liquid clouds – Part IV: DSD evolution and mixing diagrams},
author = {Pinsky, Mark and Khain, Alexander},
abstractNote = {Evolution of droplet size distribution (DSD) due to mixing between cloudy and dry volumes is investigated for different values of the cloud fraction and for 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, LWC and mean volume 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 the normalized cube of the mean volume radius on the cloud fraction were compared with those on normalized droplet concentration and found to be quite different. If the normalized droplet concentration is used, mixing diagrams do not show any significant dependence on relative humidity in the dry volume. The main conclusion of the study is that traditional mixing diagrams cannot serve as a reliable tool for analysis of mixing type.},
doi = {10.5194/acp-18-3659-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 5,
volume = 18,
place = {United States},
year = {2018},
month = {3}
}

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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: The initial state at $t$ = 0. The left volume is a saturated cloudy volume; the right volume is an undersaturated dry air volume.

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Works referenced in this record:

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