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The Impact of Cumulus Clouds and CCN Regeneration on Aerosol Vertical Distribution and Size.

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Title: The Impact of Cumulus Clouds and CCN Regeneration on Aerosol Vertical Distribution and Size.
Authors: Arieli, Yael1 (AUTHOR), Khain, Alexander2 (AUTHOR) alexander.khain@mail.huji.ac.il, Gavze, Ehud2 (AUTHOR), Altaratz, Orit1 (AUTHOR), Eytan, Eshkol1 (AUTHOR), Koren, Ilan1 (AUTHOR) ilan.koren@weizmann.ac.il
Source: Journal of the Atmospheric Sciences. Jan2025, Vol. 82 Issue 1, p107-118. 12p.
Subjects: Cumulus clouds, Aerosols, Aerosol analysis, Stratospheric aerosols, Atmospheric models, Pollution, Cloud physics
Abstract: This study employs a high-resolution (10 m) System for Atmospheric Modeling (SAM) coupled with the spectral bin microphysical (SBM) scheme to thoroughly investigate the processes governing the evolution of aerosol properties within and outside a shallow cumulus cloud. The model encompasses the complete life cycle of cloud droplets, starting from their formation through their evolution until their complete evaporation or sedimentation to the ground. Additionally, the model tracks the aerosols' evolution both within the droplets and in the air. Aerosols are transported within the droplets, grow by droplet coalescence, and are released into the atmosphere after droplet evaporation (regeneration process). The aerosol concentration increases by droplet evaporation and decreases along with falling drops. So, the effects of clouds on the surrounding aerosols depend on the microphysical and dynamic processes, which in turn depend on the amount of background aerosols; here, we compare clean and polluted conditions. It is shown that the regeneration process is highly important and that shallow trade cumulus clouds significantly impact the vertical profile of aerosol concentration in the lower troposphere, as well as their size distribution, and can serve as a source of large cloud condensation nuclei. Furthermore, it is shown that both precipitating and nonprecipitating boundary layer clouds contribute to a substantial increase in aerosol concentration within the inversion layer due to intense evaporation. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: The Impact of Cumulus Clouds and CCN Regeneration on Aerosol Vertical Distribution and Size.
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  Data: <searchLink fieldCode="AR" term="%22Arieli%2C+Yael%22">Arieli, Yael</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khain%2C+Alexander%22">Khain, Alexander</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> alexander.khain@mail.huji.ac.il</i><br /><searchLink fieldCode="AR" term="%22Gavze%2C+Ehud%22">Gavze, Ehud</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Altaratz%2C+Orit%22">Altaratz, Orit</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Eytan%2C+Eshkol%22">Eytan, Eshkol</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Koren%2C+Ilan%22">Koren, Ilan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ilan.koren@weizmann.ac.il</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+Atmospheric+Sciences%22">Journal of the Atmospheric Sciences</searchLink>. Jan2025, Vol. 82 Issue 1, p107-118. 12p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Cumulus+clouds%22">Cumulus clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosol+analysis%22">Aerosol analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Stratospheric+aerosols%22">Stratospheric aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+models%22">Atmospheric models</searchLink><br /><searchLink fieldCode="DE" term="%22Pollution%22">Pollution</searchLink><br /><searchLink fieldCode="DE" term="%22Cloud+physics%22">Cloud physics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study employs a high-resolution (10 m) System for Atmospheric Modeling (SAM) coupled with the spectral bin microphysical (SBM) scheme to thoroughly investigate the processes governing the evolution of aerosol properties within and outside a shallow cumulus cloud. The model encompasses the complete life cycle of cloud droplets, starting from their formation through their evolution until their complete evaporation or sedimentation to the ground. Additionally, the model tracks the aerosols' evolution both within the droplets and in the air. Aerosols are transported within the droplets, grow by droplet coalescence, and are released into the atmosphere after droplet evaporation (regeneration process). The aerosol concentration increases by droplet evaporation and decreases along with falling drops. So, the effects of clouds on the surrounding aerosols depend on the microphysical and dynamic processes, which in turn depend on the amount of background aerosols; here, we compare clean and polluted conditions. It is shown that the regeneration process is highly important and that shallow trade cumulus clouds significantly impact the vertical profile of aerosol concentration in the lower troposphere, as well as their size distribution, and can serve as a source of large cloud condensation nuclei. Furthermore, it is shown that both precipitating and nonprecipitating boundary layer clouds contribute to a substantial increase in aerosol concentration within the inversion layer due to intense evaporation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
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      – Type: doi
        Value: 10.1175/JAS-D-24-0112.1
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 107
    Subjects:
      – SubjectFull: Cumulus clouds
        Type: general
      – SubjectFull: Aerosols
        Type: general
      – SubjectFull: Aerosol analysis
        Type: general
      – SubjectFull: Stratospheric aerosols
        Type: general
      – SubjectFull: Atmospheric models
        Type: general
      – SubjectFull: Pollution
        Type: general
      – SubjectFull: Cloud physics
        Type: general
    Titles:
      – TitleFull: The Impact of Cumulus Clouds and CCN Regeneration on Aerosol Vertical Distribution and Size.
        Type: main
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          Name:
            NameFull: Arieli, Yael
      – PersonEntity:
          Name:
            NameFull: Khain, Alexander
      – PersonEntity:
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            NameFull: Gavze, Ehud
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            NameFull: Altaratz, Orit
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            NameFull: Eytan, Eshkol
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            NameFull: Koren, Ilan
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            – D: 01
              M: 01
              Text: Jan2025
              Type: published
              Y: 2025
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              Value: 00224928
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              Value: 82
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              Value: 1
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            – TitleFull: Journal of the Atmospheric Sciences
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