Aerosol-Cloud-Climate interactions

We discovered anthropogenic glaciation of supercooled liquid-water clouds and anthropogenic snowfall events downwind industrial aerosol hot spots (Toll et al., 2024 Science).

In the image on the left, the plume of snow is seen downwind of the cement factory when glaciated clouds have cleared away.

We discovered plume-shaped industrial aerosol perturbations on liquid-water clouds that we use as opportunistic experiments to better constrain anthropogenic climate forcing (Toll et al., 2019 Nature).

In the image on the right, bright greyish aerosol-polluted cloud lines are visible in the near-infrared composite satellite image. Polluted cloud tracks originate from the industrial and urban aerosol sources marked with bright white.

Fire tracks

We discovered large-scale anthropogenic aerosol perturbations on liquid-water clouds (Trofimov et al., 2020 JGR Atmospheres).

In the image on the left, bright greyish large-scale aerosol-polluted cloud area is visible in the western part of the near-infrared composite satellite image.


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Velle’s presentation on climate change in the Parliament of Estonia

Velle presented the contemporary scientific understanding of anthropogenic climate change in the Parliament of Estonia https://www.youtube.com/watch?v=wGHUI7APtqM

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ERAD 2024 best oral presentation award presented to Jorma

Best Oral Presentation Award to Jorma Rahu for the presentation “Ground-based Precipitation Radar Signatures of Anthropogenic Snowfall Events Downwind of Industrial Air Pollution Hot Spots” 12th European Conference on RADar in Meteorology and Hydrology (ERAD 2024), September 9-13 https://www.erad2024.it/ https://poster.easyabstract.it/ERAD2024/abstract/15091/161/882 …

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Industrial snow: Factories trigger local snowfall by freezing clouds

Our research was covered by phys.org https://phys.org/news/2024-11-industrial-factories-trigger-local-snowfall.html

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Industrial plumes seed snow

Our research was covered by the Chemical and Engineering News https://cen.acs.org/environment/atmospheric-chemistry/Industrial-plumes-seed-snow/102/i36?sc=230901_cenrssfeed_eng_latestnewsrss_cen

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When Pollution Brings Snow

Our research was covered by NAUTILUS https://nautil.us/when-pollution-brings-snow-1131658/?utm_source=tw-naut&utm_medium=organic-social

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Plumes of pollution from big factories can make it snow

Our research was covered by the NewScientist https://www.newscientist.com/article/2456202-plumes-of-pollution-from-big-factories-can-make-it-snow

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How industrial pollution is altering clouds and making it snow

Our research was covered by The Washington Post. https://www.washingtonpost.com/climate-environment/2024/11/14/industrial-pollution-ice-altering-clouds-snow

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Link to freely access Science paper on the anthropogenic glaciation of clouds

https://www.science.org/stoken/author-tokens/ST-2255/full

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Velle’s News & Views feature in Nature Geoscience “Polluted skies are cloudier”

Analyses of the 2014 Iceland–Holuhraun volcanic eruption revealed the emitted aerosols induced a 10% increase in cloud coverage above the region, suggesting anthropogenic aerosols might strongly cool the Earth’s climate by increasing the cloud coverage. https://www.nature.com/articles/s41561-022-00997-0

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University of Tartu sets out to increase climate awareness

With the new academic year, a joint project of Estonian universities was launched, aiming to increase the climate awareness of Estonian society with systematic climate education at all levels of education. In the project, education strategies are developed, learning materials …

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