[World Meteorological Organization: 2020 Antarctic ozone hole is big and deep] On October 6, local time, the World Meteorological Organization stated that the Antarctic ozone hole in 2020 began to grow rapidly in mid-August and reached approximately 24 million square kilometers in early October. Peak.
The cavity now covers an area of 23 million square kilometers, which is higher than the average of the past ten years, and covers most of the Antarctic continent. In the southern hemisphere spring, from August to October, the size of the ozone hole over Antarctica increases, and usually reaches its maximum size from mid-September to mid-October. When the atmospheric stratosphere temperature rises in the southern hemisphere in the late spring, ozone depletion slows down, and the polar vortex weakens and eventually breaks. By the end of December, ozone levels had returned to normal.