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This README describes air pollution sources leading to anthropogenic glaciation of supercooled liquid-water clouds. The glaciation events were identified in Terra MODIS data.

Additional information
Velle Toll velle.toll@ut.ee

This work is funded by the Estonian Research Council grant PRG1726.
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DATASET
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The dataset contains locations and descriptions of air pollution sources leading to anthropogenic glaciation of supercooled liquid-water clouds identified in Terra MODIS data. 

Creator: Velle Toll
Organisation: University of Tartu
Rights-holder: University of Tartu
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TERMS OF USE
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Copyright 2024 University of Tartu. 
This dataset is licensed by the rights-holder under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/.
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CONTENTS
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There are two different lists of industrial point sources leading to glaciation events. 

aerosol_sources_glaciation.csv
We identified 67 different aerosol sources leading to glaciation events. 

nuclear_power_plants_glaciation.csv 
In five cases, we saw glaciation downwind nuclear power plants. We identified glaciation events downwind of four different nuclear power plants.

In addition, there is a list of three cases of plume-shaped areas of snow on the ground caused by glaciation events downwind aerosol sources. The snow areas were identified in MODIS satellite images.
plume-shaped_areas_of_snow.csv
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METHOD and PROCESSING
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We used the US National Aeronautics and Space Administration (NASA) Global Imagery Browse Services (GIBS) near-infrared daily composite Terra MODIS satellite images available through the NASA Worldview interactive interface to visually identify glaciation events. 
In this composite, measurements at the wavelengths 0.459–0.479 μm, 1.628–1.652 μm and 2.105–2.155 μm are used with a horizontal resolution of 500 metres. 

Establishing a link between glaciation, snowfall and reduced cloud cover in supercooled liquid-water cloud decks allowed us to identify glaciation events based on plume-shaped areas of reduced cloud cover in Terra MODIS data. 
After visually identifying glaciation events in Terra MODIS satellite images, we identified the aerosol sources leading to glaciation using Google Maps.
To clarify the role of factors other than aerosols in the observed glaciation, we also identified glaciation events downwind nuclear power plants in Eastern Europe (Latitudes 45° to 59° and Longitudes 25° to 49°) in the winter months (December, January, February) in years 2005 to 2014.
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