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:
-
- 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); 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. https://doi.org/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. https://doi.org/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 = {Tue Mar 13 00:00:00 EDT 2018},
month = {Tue Mar 13 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Effects of in-cloud nucleation and turbulence on droplet spectrum formation in cumulus clouds
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Drizzle formation in stratocumulus clouds: effects of turbulent mixing
journal, January 2016
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journal, January 2016
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mixing
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mixing
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- Atmospheric Chemistry and Physics, Vol. 16, Issue 14
Works referencing / citing this record:
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