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Mechanisms for Indirect Effects from Ice Nucleating Particles on Continental Clouds and Radiation

Waman, Deepak LU orcid ; Jadav, Arti LU orcid ; Patade, Sachin LU ; Gautam, Martanda LU ; Deshmukh, Akash LU and Phillips, Vaughan LU orcid (2025) In Journal of the Atmospheric Sciences 82(8). p.1693-1720
Abstract

Mechanisms of the aerosol indirect effects (AIEs) from ice nucleating particles (INPs) are investigated with the cloud-resolving “aerosol–cloud” (AC) model with a hybrid bin–bulk microphysics scheme coupled with a radiation scheme in 1) continental deep convection observed during the Midlatitude Continental Convective Clouds Experiment (MC3E) over Oklahoma and 2) supercooled stratiform clouds observed during the Aerosol Properties, Processes And Influences on the Earth’s climate (APPRAISE) campaign over Larkhill, United Kingdom. In both cases, the sensitivity of cloud micro-and macrophysical, and associated radiative, properties is examined with respect to the inclusion of anthropogenic INPs. In both cases, anthropogenic INPs reduce the... (More)

Mechanisms of the aerosol indirect effects (AIEs) from ice nucleating particles (INPs) are investigated with the cloud-resolving “aerosol–cloud” (AC) model with a hybrid bin–bulk microphysics scheme coupled with a radiation scheme in 1) continental deep convection observed during the Midlatitude Continental Convective Clouds Experiment (MC3E) over Oklahoma and 2) supercooled stratiform clouds observed during the Aerosol Properties, Processes And Influences on the Earth’s climate (APPRAISE) campaign over Larkhill, United Kingdom. In both cases, the sensitivity of cloud micro-and macrophysical, and associated radiative, properties is examined with respect to the inclusion of anthropogenic INPs. In both cases, anthropogenic INPs reduce the mean sizes of cloud droplets and ice crystals, boosting their concentrations by 10%–30%. Also, their cloud extents and optical thicknesses increase with anthropogenic INPs. At the top of the atmosphere (TOA), anthropogenically boosted INPs cause a net cooling in APPRAISE (21.3 6 0.19 W m22), chiefly from liquid-only clouds. With MC3E, there is little net flux change (20.1 6 0.94 W m22).Theroleoficeformation processes, including secondary ice production (SIP) and time-dependent INP freezing in simulated AIEs, is assessed, revealing two new indirect effects: 1) the “SIP” indirect effect and 2) the INP time dependence indirect effect. Prohibiting SIP reduces cooling by 15% in weakly precipitating APPRAISE layer clouds and increases warming by 18 times in MC3E deep convection. Time-dependent INP freezing, when absent, weakens the net cooling by 42% in APPRAISE and strengthens it byafactorof16inMC3E.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aerosol indirect effect, Aerosol-cloud interaction, Cloud microphysics, Cloud resolving models, Ice crystals, Secondary ice production
in
Journal of the Atmospheric Sciences
volume
82
issue
8
pages
28 pages
publisher
Amer Meteorological Soc
external identifiers
  • scopus:105012141627
ISSN
0022-4928
DOI
10.1175/JAS-D-24-0143.1
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 American Meteorological Society.
id
ba2c5c02-8ba6-48bc-b5b5-008e71bf372d
date added to LUP
2025-12-03 14:57:25
date last changed
2025-12-03 14:58:39
@article{ba2c5c02-8ba6-48bc-b5b5-008e71bf372d,
  abstract     = {{<p>Mechanisms of the aerosol indirect effects (AIEs) from ice nucleating particles (INPs) are investigated with the cloud-resolving “aerosol–cloud” (AC) model with a hybrid bin–bulk microphysics scheme coupled with a radiation scheme in 1) continental deep convection observed during the Midlatitude Continental Convective Clouds Experiment (MC3E) over Oklahoma and 2) supercooled stratiform clouds observed during the Aerosol Properties, Processes And Influences on the Earth’s climate (APPRAISE) campaign over Larkhill, United Kingdom. In both cases, the sensitivity of cloud micro-and macrophysical, and associated radiative, properties is examined with respect to the inclusion of anthropogenic INPs. In both cases, anthropogenic INPs reduce the mean sizes of cloud droplets and ice crystals, boosting their concentrations by 10%–30%. Also, their cloud extents and optical thicknesses increase with anthropogenic INPs. At the top of the atmosphere (TOA), anthropogenically boosted INPs cause a net cooling in APPRAISE (21.3 6 0.19 W m<sup>22</sup>), chiefly from liquid-only clouds. With MC3E, there is little net flux change (20.1 6 0.94 W m<sup>22</sup>).Theroleoficeformation processes, including secondary ice production (SIP) and time-dependent INP freezing in simulated AIEs, is assessed, revealing two new indirect effects: 1) the “SIP” indirect effect and 2) the INP time dependence indirect effect. Prohibiting SIP reduces cooling by 15% in weakly precipitating APPRAISE layer clouds and increases warming by 18 times in MC3E deep convection. Time-dependent INP freezing, when absent, weakens the net cooling by 42% in APPRAISE and strengthens it byafactorof16inMC3E.</p>}},
  author       = {{Waman, Deepak and Jadav, Arti and Patade, Sachin and Gautam, Martanda and Deshmukh, Akash and Phillips, Vaughan}},
  issn         = {{0022-4928}},
  keywords     = {{Aerosol indirect effect; Aerosol-cloud interaction; Cloud microphysics; Cloud resolving models; Ice crystals; Secondary ice production}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{1693--1720}},
  publisher    = {{Amer Meteorological Soc}},
  series       = {{Journal of the Atmospheric Sciences}},
  title        = {{Mechanisms for Indirect Effects from Ice Nucleating Particles on Continental Clouds and Radiation}},
  url          = {{http://dx.doi.org/10.1175/JAS-D-24-0143.1}},
  doi          = {{10.1175/JAS-D-24-0143.1}},
  volume       = {{82}},
  year         = {{2025}},
}