The eruption of the Chilean Calbuco volcano on April 22, 2015 stretched the Antarctic Ozone Hole to a record size nearly as large as Africa, according to new study.
Not caused by humans!
Researchers expected the hole, which forms in late September, to eventually shrink. Instead, the ozone hole grew by 4.5 million sq km (1.7 million sq miles) in October 2015.
Susan Solomon, an atmospheric chemist at the Massachusetts Institute of Technology, authored a 2016 study in Science suggesting Calbuco’s volcanic aerosols had eaten away at the ozone layer.
When volcanoes erupt, they spew sulfur dioxide into the sky. The sulfur dioxide then condenses into tiny airborne particles that tend to congregate into clouds over polar areas, where chemical reactions ultimately deplete portions of the ozone layer.
Thanks to Guy Wilson for this link