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Title: Theoretical investigation of mixing in warm clouds – Part 2: Homogeneous mixing

Abstract

Evolution of monodisperse and polydisperse droplet size distributions (DSD) during homogeneous mixing is analyzed. Time-dependent universal analytical expressions for supersaturation and liquid water content are derived. For an initial monodisperse DSD, these quantities are shown to depend on a sole non-dimensional parameter. The evolution of moments and moment-related functions in the course of homogeneous evaporation of polydisperse DSD is analyzed using a parcel model. It is shown that the classic conceptual scheme, according to which homogeneous mixing leads to a decrease in droplet mass at constant droplet concentration, is valid only in cases of monodisperse or initially very narrow polydisperse DSD. In cases of wide polydisperse DSD, mixing and successive evaporation lead to a decrease of both mass and concentration, so the characteristic droplet sizes remain nearly constant. As this feature is typically associated with inhomogeneous mixing, we conclude that in cases of an initially wide DSD at cloud top, homogeneous mixing is nearly indistinguishable from inhomogeneous mixing.

Authors:
 [1];  [1];  [2];  [1]
  1. Hebrew Univ. of Jerusalem (Israel). Department of Atmospheric Sciences
  2. Environment Canada, Cloud Physics and Severe Weather Section, Toronto (Canada)
Publication Date:
Research Org.:
Hebrew Univ. of Jerusalem (Israel). Department of Atmospheric Sciences
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1436585
Grant/Contract Number:  
SC0006788
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 16; Journal Issue: 14; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Pinsky, Mark, Khain, Alexander, Korolev, Alexei, and Magaritz-Ronen, Leehi. Theoretical investigation of mixing in warm clouds – Part 2: Homogeneous mixing. United States: N. p., 2016. Web. doi:10.5194/acp-16-9255-2016.
Pinsky, Mark, Khain, Alexander, Korolev, Alexei, & Magaritz-Ronen, Leehi. Theoretical investigation of mixing in warm clouds – Part 2: Homogeneous mixing. United States. doi:10.5194/acp-16-9255-2016.
Pinsky, Mark, Khain, Alexander, Korolev, Alexei, and Magaritz-Ronen, Leehi. Thu . "Theoretical investigation of mixing in warm clouds – Part 2: Homogeneous mixing". United States. doi:10.5194/acp-16-9255-2016. https://www.osti.gov/servlets/purl/1436585.
@article{osti_1436585,
title = {Theoretical investigation of mixing in warm clouds – Part 2: Homogeneous mixing},
author = {Pinsky, Mark and Khain, Alexander and Korolev, Alexei and Magaritz-Ronen, Leehi},
abstractNote = {Evolution of monodisperse and polydisperse droplet size distributions (DSD) during homogeneous mixing is analyzed. Time-dependent universal analytical expressions for supersaturation and liquid water content are derived. For an initial monodisperse DSD, these quantities are shown to depend on a sole non-dimensional parameter. The evolution of moments and moment-related functions in the course of homogeneous evaporation of polydisperse DSD is analyzed using a parcel model. It is shown that the classic conceptual scheme, according to which homogeneous mixing leads to a decrease in droplet mass at constant droplet concentration, is valid only in cases of monodisperse or initially very narrow polydisperse DSD. In cases of wide polydisperse DSD, mixing and successive evaporation lead to a decrease of both mass and concentration, so the characteristic droplet sizes remain nearly constant. As this feature is typically associated with inhomogeneous mixing, we conclude that in cases of an initially wide DSD at cloud top, homogeneous mixing is nearly indistinguishable from inhomogeneous mixing.},
doi = {10.5194/acp-16-9255-2016},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 14,
volume = 16,
place = {United States},
year = {2016},
month = {7}
}

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    Works referencing / citing this record:

    Theoretical study of mixing in liquid clouds – Part 1: Classical concepts
    journal, January 2016

    • Korolev, Alexei; Khain, Alex; Pinsky, Mark
    • Atmospheric Chemistry and Physics, Vol. 16, Issue 14
    • DOI: 10.5194/acp-16-9235-2016