In the last week a rare hole has been noticed in the ozone layer above the Arctic. This year the polar vortex has been stable across the Arctic with record breaking low temperatures in the atmosphere above the pole. As far as I can see, the blue contoured area over Greenland marks the spot of the ozone hole in the above image. Here is the scientific reasoning behind its appearance, which you’ll be glad to know has thought to have nothing to do with the Covid-19 shutdown which has drastically reduced the amount of air pollution across the world.
“The hole is principally a geophysical curiosity. We monitored unusual dynamic conditions, which drive the process of chemical depletion of ozone allowed for lower temperatures and a more stable vortex than usual over the Arctic, which then triggered the formation of polar stratospheric clouds and the catalytic destruction of ozone.”Vincent-Henri Peuch, director of the Copernicus Atmosphere Monitoring Service.
More details and an interesting tête-à-tête between some very clever people can be found in this tweet.