Although 2020 was a difficult year for many (if not for all), it did bring at least one piece of good news вЂ” the largest hole in the history of observations of the ozone hole has closed.
This was reported by the World Meteorological Organization at the UN.
A record-breaking ozone hole formed over Antarctica in late July began to grow rapidly in mid-August and reached a maximum size of 24.8 million square kilometers by September 20. However, a few days before New Year's Eve, it tightened on its own.
This ozone hole has been called one of the most extensive and deepest since monitoring of the ozone layer of the Earth began 40 years ago.
????2020's long-lived #OzoneHole closed around the end of December. This concluded a remarkable record-setting season, primarily driven by a strong polar vortex and very cold temperatures in the Antarctic stratosphere.— Copernicus ECMWF (@CopernicusECMWF) January 5, 2021
More on CAMS' ozone monitoringвћЎпёЏhttps://t.co/c2tPB8OBuQ pic.twitter.com/NzA3rB4l8L
It is worth noting that ozone holes are a seasonal phenomenon. They manifest themselves in a drop in the concentration of ozone in the ozone layer of the Earth. Cold polar vortices and very low temperatures in the stratosphere contribute to this.
With the onset of spring in the southern hemisphere ozone depletion slows down, the polar vortex weakens and eventually collapses, and by the end of December, the ozone level returns to normal.
The WMO specified that at moment the ozone layer is at the stage of recovery. Meteorologists predict that the amount of ozone over Antarctica will return to values of 1980 by 2060. That is, the chemicals destroying ozone will decay in the atmosphere only in 40 years.
Recall that the World Meteorological Organization noted that industry restrictions imposed because of the coronavirus pandemic had no significant impact on the process of pollution of the Earth's atmosphere.
We also wrote that in September in the Arctic a record rate of melting of glaciers was set, and the volume of ice fell to its lowest level.