Ice nucleation by volcanic ash greatly alters cirrus cloud properties

Lin, Lin; Liu, Xiaohong; Zhao, Xi; Shan, Yunpeng; Ke, Ziming; Lyu, Kai; Bowman, Kenneth P.

doi:10.1126/sciadv.ads0572

Ice nucleation by volcanic ash greatly alters cirrus cloud properties

Journal Article · Fri May 09 00:00:00 EDT 2025 · Science Advances

DOI:https://doi.org/10.1126/sciadv.ads0572· OSTI ID:3019736

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Texas A & M Univ., College Station, TX (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Texas A & M Univ., College Station, TX (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The formation of ice crystals in the atmosphere strongly affects cloud properties and climate. While volcanic ash (VA) has been shown to nucleate ice crystals efficiently in laboratory settings, its importance for ice formation in the atmosphere remains elusive. Here, we show evidence of cirrus modification by volcanic eruptions through ice nucleation on VA, revealed by abrupt changes in cirrus properties following volcanic eruptions based on satellite measurements. The distinct changes captured are a phenomenal decrease in number, an increase in size of ice crystals in cirrus clouds, and an increase in cirrus occurrences after ash-rich volcanic eruptions. Conversely, no such changes were detected following the ash-poor eruption. We propose a cirrus formation mechanism where VA nucleates ice heterogeneously, suppressing homogeneous freezing and resulting in fewer but larger ice crystals. This suppression of homogeneous freezing by VA is supported by process-level cloud microphysical simulations. Our findings advance the understanding of aerosol–ice cloud interactions and illuminate cirrus geoengineering.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-06CH11357; AC52-07NA27344; NA0003525

Other Award/Contract Number:: SCW1800
80NSSC19K0341

OSTI ID:: 3019736

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 19 Vol. 11; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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