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The Antarctic ozone hole is the smallest since it was discovered
Key Excerpts from Article on Website of CNN News
Posted: January 6th, 2020
https://www.cnn.com/2019/10/21/world/antarctic-ozone-hole-sh...
While the ozone hole over Antarctica typically grows in September and October, scientists observed the smallest ozone hole since they first began observing it in 1982, according to a joint release by NASA and NOAA. Unusual weather patterns in the upper atmosphere limited depletion of ozone, the layer in our atmosphere that acts like sunscreen and protects us from ultraviolet radiation. On September 8, the ozone hole reached a peak of 6.3 million square miles and then shrank to less than 3.9 million square miles, according to the report. Usually, the hole would grow to reach 8 million square miles. The annual ozone hole forms when rays from the sun interact with the ozone and man-made compounds such as chlorine and bromine to deplete the ozone. This occurs during late winter in the Southern Hemisphere. Cloud particles in the cold stratosphere lead to reactions that destroy ozone molecules, which are made of three oxygen atoms. But when temperatures are warmer, these clouds don't form, which limits ozone destruction. This is only the third time in 40 years when warm temperatures caused by weather systems have actually helped limit the ozone hole. This also occurred in 1988 and 2002. But the scientists say there is no connection they've identified to link the patterns with climate change. The ozone layer over the Antarctic is expected to recover by 2070 as compounds used as coolants, called chlorofluorocarbons, decline. They were regulated 32 years ago by the Montreal Protocol.
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