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Record-Breaking 2020 Ozone Hole Closes after an Exceptional Season Due to Occurring Meteorological Conditions, and the Continued Presence of Ozone Depleting Substances in the Atmosphere

6 January 2021 (WMO)   The record-breaking 2020 Antarctic ozone hole finally closed at the end of December after an exceptional season due to naturally occurring meteorological conditions and the continued presence of ozone depleting substances in the atmosphere. The 2020 Antarctic ozone hole grew rapidly from mid-August and peaked at around 24.8 million square kilometres on 20 September 2020, spreading over most of the Antarctic continent. It was the longest-lasting and one of the largest and deepest holes since the ozone layer monitoring began 40 years ago. It was driven by a strong, stable and cold polar vortex and very cold temperatures in the stratosphere (the layer of the atmosphere between around 10 km and round 50 km altitude). The same meteorological factors also contributed to the record 2020 Arctic ozone hole.

Wildfires in the Arctic Circle and western US reached unprecedented intensity in 2020

Wildfires in the Arctic Circle and western US reached unprecedented intensity in 2020 – although global fire emissions are decreasing overall, new EU data shows.  While 2020 was one of the lowest years for active fires at the global scale, fire intensity has been far higher in the worst affected areas, according to the EU s Copernicus Atmosphere Monitoring Service (CAMS).  There s been increased wildfire activity in Siberia, Colorado, California, Australia, and parts of the Caribbean and the Pantanal region of Southern Brazil, while activity in southern tropical Africa has been very low this year.  As wildfires burn, carbon stored in trees and other vegetation combusts, releasing carbon dioxide (CO2) and other potent greenhouse gases into the atmosphere. 

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