Cited by 26Atmospheric aerosols and cloudsClimate Change and GeoengineeringMeteorological Phenomena and Simulations

Cirrus cloud thinning using a more physically based ice microphysics scheme in the ECHAM-HAM general circulation model

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Tully, Colin, Neubauer, David, Omanovic, Nadja, Lohmann, Ulrike·2022·Atmospheric Chemistry and Physics

Published version of a preprint

Abstract

Abstract. Cirrus cloud thinning (CCT) is a relatively new radiation management proposal to counteract anthropogenic climate warming by targeting Earth’s terrestrial radiation balance. The efficacy of this method was presented in several general circulation model (GCM) studies that showed widely varied radiative responses, originating in part from the differences in the representation of cirrus ice microphysics between the different GCMs. The recent implementation of a new, more physically based ice microphysics scheme (Predicted Particle Properties, P3) that abandons ice hydrometeor size class separation into the ECHAM-HAM GCM, coupled to a new approach for calculating cloud fractions that increases the relative humidity (RH) thresholds for cirrus cloud formation, motivated a reassessment of CCT efficacy. In this study, we first compared CCT sensitivity between the new cloud fraction approach and the original ECHAM-HAM cloud fraction approach. With the P3 scheme and the higher RH thresholds for cirrus cloud formation, we find a significant cooling response of −0.36 Wm−2 only for our simulation with a seeding particle concentration of 1 L−1, due mostly to rapid cloud adjustments. The most notable response is the reduction of the maximum global-mean net top-of-atmosphere (TOA) radiative anomalies from overseeding by more than 50 %, from 9.0 Wm−2 with the original cloud fraction approach, down to 4.3 Wm−2 using the new cloud fraction RH thresholds by avoiding artificial ice-cloud expansion upon ice nucleation. We attribute the large positive TOA anomalies to seeding particles overtaking both homogeneous nucleation and heterogeneous nucleation on mineral dust particles within cirrus clouds to produce more numerous and smaller ice crystals. This effect is amplified by longer ice residence times in clouds due to the more realistic, slower removal of ice via sedimentation in the P3 scheme. In an effort to avoid this overtaking effect of seeding particles, we increased the default critical ice saturation ratio (Si,seed) for ice nucleation on seeding particles from the default value of 1.05 to 1.35 in a second sensitivity test. With the higher Si,seed we eliminate overseeding and are able to produce cooling responses over a broader range of seeding particle concentrations, with the largest cooling of −0.32 Wm−2 for a seeding particle concentration of 10 L−1, which suggests that Si,seed is a key factor to consider for future CCT studies. However, the global-mean TOA anomalies contain high uncertainty. In response, we examined the TOA responses regionally and found that specific regions only show a small potential for targeted CCT, which is partially enhanced by using the larger Si,seed. Finally, in a seasonal analysis of TOA responses to CCT, we find that our results do not support the previous finding that high-latitude wintertime seeding is a feasible strategy to enhance CCT efficacy, as seeding in our model enhances the already positive cirrus longwave cloud radiative effect. Instead, our results show that summertime cooling occurs due to adjustments of lower-lying mixed-phase and liquid clouds. Therefore, we conclude that CCT is unlikely to act as a feasible climate intervention strategy on a global scale, and should be investigated further with higher-resolution studies in potential target regions and with studies dedicated to assessing potentially realistic seeding particle materials.

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  • Modeling indicates that excessive INP can lead to cirrus overseeding, producing numerous small ice crystals that slow fall speeds, prolong cirrus lifetime, increasing optical thickness, and ultimately reduce outgoing longwave radiation, diminishing cooling.

    “Modeling indicates that excessive INP can lead to cirrus overseeding, producing numerous small ice crystals that slow fall speeds, prolong cirrus lifetime, increasing optical thickness, and ultimately reduce outgoing longwave radiation, diminishing cooling (Gasparini & Lohmann, 2016; Tully et al., 2022)”

    From Past Field Experiments of Solar Radiation Modification: A Review of the Scientific and Technical Aspects for Governance (2026) · cites this paper as Tully et al., 2022

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Authors
Tully, C., Neubauer, D., Omanovic, N., & Lohmann, U.
Affiliations
ETH Zurich (CH)
Corresponding author
  • Tully, Colin
  • Neubauer, David
  • Lohmann, Ulrike
Venue
Atmospheric Chemistry and Physics
Published
2022-09-07
Volume
22
Issue
17
Pages
11455-11484
ISSN
  • 1680-7316 (ISSN-L)
  • 1680-7324
OpenAlex
W4297826325
Cited by
26
References
97
Citations by year
2026: 3 · 2025: 8 · 2024: 7 · 2023: 4 · 2022: 4
FWCI
2.29
Type
journal article
Language
en
Open access
Locations
  • Atmospheric chemistry and physics (publishedVersion, cc-by)
  • Repository for Publications and Research Data (ETH Zurich) (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • ETH Zürich Research Collection
Funders
  • Horizon 2020 Framework Programme
  • Centro Svizzero di Calcolo Scientifico (s903, s1144)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Geoengineering
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
Keywords
cirrus cloud thinning, radiation management, ice microphysics, ECHAM-HAM, cloud fraction, relative humidity threshold, ice nucleation, homogeneous nucleation, heterogeneous nucleation, mineral dust, ice crystal size, climate warming mitigation, radiative forcing

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