A rare hole has opened up in the ozone layer above the Arctic, in what scientists say is the result of unusually low temperatures in the atmosphere above the north pole, reports the Guardian.
The hole, which has been tracked from space and the ground over the past few days, has reached record dimensions but is not expected to pose any danger to humans unless it moves further south. If it extends further south over populated areas, such as southern Greenland, people would be at increased risk of sunburn. However, on current trends, the hole is expected to disappear altogether in a few weeks.
According to the report,Low temperatures in the northern polar regions led to an unusual stable polar vortex, and the presence of ozone-destroying chemicals such as chlorine and bromine in the atmosphere – from human activities – caused the hole to form.
“The hole is principally a geophysical curiosity,” said Vincent-Henri Peuch, director of the Copernicus Atmosphere Monitoring Service. “We monitored unusual dynamic conditions, which drive the process of chemical depletion of ozone. [Those dynamics] 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.”
The hole is not related to the Covid-19 shutdowns that have drastically cut air pollution and reduced greenhouse gas emissions. It is also too early to say whether the unusually stable Arctic polar vortex conditions are linked with the climate crisis, or part of normal stratospheric weather variability adds the Guardian.
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