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The Impact of Regenerated Aerosols on the Microphysics of Cumulus Clouds.

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Title: The Impact of Regenerated Aerosols on the Microphysics of Cumulus Clouds.
Authors: Arieli, Yael1 (AUTHOR), Khain, Alexander2 (AUTHOR) alexander.khain@mail.huji.ac.il, Gavze, Ehud2 (AUTHOR), Altaratz, Orit1 (AUTHOR) orit.altaratz@weizmann.ac.il, Eytan, Eshkol3,4 (AUTHOR), Koren, Ilan1 (AUTHOR)
Source: Journal of the Atmospheric Sciences. Nov2025, Vol. 82 Issue 11, p2491-2503. 13p.
Subjects: Cumulus clouds, Microphysics, Precipitation (Chemistry), Cloud dynamics, Aerosols, Ecological impact
Abstract: Cumulus clouds play a crucial role in the Earth's energy balance and water cycle. The interactions between aerosols and clouds significantly influence cloud dynamic and microphysical processes, and hence their radiative and rain properties. Aerosol regeneration, the process by which the complete evaporation of droplets releases aerosol particles back to the environment, is an important aspect of this interaction. This study examines the impact of regenerated aerosols on cloud microphysics (through lateral entrainment), using high-resolution simulations of single cumulus clouds under two aerosol regimes (clean and polluted). For each regime, two simulations were conducted: one incorporating an aerosol regeneration scheme and one without. Our results reveal that aerosol regeneration significantly impacts droplet concentrations and size distributions, particularly in the diluted regions of the cloud where evaporation predominantly occurs and regenerated aerosols can be later reactivated into droplets. In clean aerosol conditions, aerosol regeneration significantly reduces surface precipitation, producing only half of the amount compared to the simulation without regeneration. These findings highlight the critical importance of accurately representing aerosol–cloud interaction, particularly aerosol regeneration, in cloud models to better capture their effect on cloud microphysics and precipitation processes. [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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Items – Name: Title
  Label: Title
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  Data: The Impact of Regenerated Aerosols on the Microphysics of Cumulus Clouds.
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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)<i> orit.altaratz@weizmann.ac.il</i><br /><searchLink fieldCode="AR" term="%22Eytan%2C+Eshkol%22">Eytan, Eshkol</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Koren%2C+Ilan%22">Koren, Ilan</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+Atmospheric+Sciences%22">Journal of the Atmospheric Sciences</searchLink>. Nov2025, Vol. 82 Issue 11, p2491-2503. 13p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Cumulus+clouds%22">Cumulus clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Microphysics%22">Microphysics</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Cloud+dynamics%22">Cloud dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Ecological+impact%22">Ecological impact</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Cumulus clouds play a crucial role in the Earth's energy balance and water cycle. The interactions between aerosols and clouds significantly influence cloud dynamic and microphysical processes, and hence their radiative and rain properties. Aerosol regeneration, the process by which the complete evaporation of droplets releases aerosol particles back to the environment, is an important aspect of this interaction. This study examines the impact of regenerated aerosols on cloud microphysics (through lateral entrainment), using high-resolution simulations of single cumulus clouds under two aerosol regimes (clean and polluted). For each regime, two simulations were conducted: one incorporating an aerosol regeneration scheme and one without. Our results reveal that aerosol regeneration significantly impacts droplet concentrations and size distributions, particularly in the diluted regions of the cloud where evaporation predominantly occurs and regenerated aerosols can be later reactivated into droplets. In clean aerosol conditions, aerosol regeneration significantly reduces surface precipitation, producing only half of the amount compared to the simulation without regeneration. These findings highlight the critical importance of accurately representing aerosol–cloud interaction, particularly aerosol regeneration, in cloud models to better capture their effect on cloud microphysics and precipitation processes. [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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        Value: 10.1175/JAS-D-25-0011.1
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 2491
    Subjects:
      – SubjectFull: Cumulus clouds
        Type: general
      – SubjectFull: Microphysics
        Type: general
      – SubjectFull: Precipitation (Chemistry)
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      – SubjectFull: Cloud dynamics
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      – SubjectFull: Aerosols
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      – SubjectFull: Ecological impact
        Type: general
    Titles:
      – TitleFull: The Impact of Regenerated Aerosols on the Microphysics of Cumulus Clouds.
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            NameFull: Arieli, Yael
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            NameFull: Khain, Alexander
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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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            – D: 01
              M: 11
              Text: Nov2025
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              Y: 2025
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