Glaciation of liquid clouds, snowfall, and reduced cloud cover at industrial aerosol hot spots
- University of Tartu (Estonia)
- Univ. of Oxford (United Kingdom)
- Environment and Climate Change Canada, Toronto, ON (Canada)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- University of Leeds (United Kingdom)
- Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
- Univ. of California, San Diego, CA (United States)
- Univ. of Oslo (Norway)
- Univ. of Helsinki (Finland)
- Univ. of Reading (United Kingdom)
The ability of anthropogenic aerosols to freeze supercooled cloud droplets remains debated. Here, in this work, we present observational evidence for the glaciation of supercooled liquid-water clouds at industrial aerosol hot spots at temperatures between -10° and -24°C. Compared with the nearby liquid-water clouds, shortwave reflectance was reduced by 14% and longwave radiance was increased by 4% in the glaciation-affected regions. There was an 8% reduction in cloud cover and an 18% reduction in cloud optical thickness. Additionally, daily glaciation-induced snowfall accumulations reached 15 millimeters. Glaciation events downwind of industrial aerosol hot spots indicate that anthropogenic aerosols likely serve as ice-nucleating particles. However, rare glaciation events downwind of nuclear power plants indicate that factors other than aerosol emissions may also play a role in the observed glaciation events.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2478847
- Report Number(s):
- PNNL-SA--205704
- Journal Information:
- Science, Journal Name: Science Journal Issue: 6723 Vol. 386; ISSN 0036-8075
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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