Yay! The ozone layer hole the smallest it has ever been

22 Octobre, 2019, 14:10 | Auteur: Therese Cote
  • Yay! The ozone layer hole the smallest it has ever been

The Antarctic ozone gap hit its smallest annual peak on report since monitoring started in 1982, the Nationwide Oceanic and Atmospheric Administration and NASA introduced Monday.

Unusually warm temperatures above Antarctica this month caused the ozone hole to shrink to its smallest size on record according to NOAA scientists.

There have been global efforts to reduce the use of substances, including some types of aerosol products, that can damage the ozone layer.

The 2019 hole hit its maximum size of 6.3 million square miles (16.4 million square kilometers) on September 8.

This time-lapse photo from September 9, 2019, shows the flight path of an ozonesonde as it rises into the atmosphere over the South Pole from the Amundsen-Scott South Pole Station. The same weather patterns led to strangely runt ozone holes in 1988 and 2002, they reported.

This is the third time in the last 40 years that weather systems have caused warm temperatures that limit ozone depletion, said Susan Strahan, an atmospheric scientist with Universities Space Research Association, who works at NASA. The scientist, however, emphasized that it should not be considered as a sign that the ozone is recovering.

"It's important to recognize that what we're seeing this year is due to warmer stratospheric temperatures", Paul Newman, chief scientist for Earth Sciences at NASA's Goddard Space Flight Center, said in a news release.

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However, chemicals used for refrigeration purposes, such as chlorofluorocarbons (CFCs) and hydro-fluorocarbons (HFCs), break down stratospheric ozone molecules, thereby exposing the planet's surface to greater amounts of UV radiation. These chemical reactions are maximized on the floor of high-flying clouds, however milder-than-average circumstances within the stratosphere above Antarctica this 12 months inhibited cloud formation and persistence, in response to a NASA assertion.

In distinction with world warming, the discovery of the ozone hole by scientists at the British Antarctic See in 1985 galvanized world motion. Although we're making progress in cutting down on the use of ozone-depleting chemicals, the milestone doesn't mean we've solved the problem, the agencies cautioned. This helped forestall the lack of a substantial quantity of ozone.

The weather methods that minimized ozone depletion in September, identified as "sudden stratospheric warming" events, were strangely strong this 365 days.

As an different, the Antarctic polar vortex develop to be once knocked off balance and slowed vastly, from a median wind tempo of 161 miles per hour to luminous 67 miles per hour. To boot to, the reconfigured weather intention helped to import ozone-rich air from diversified parts of the Southern Hemisphere, in would favor to sealing off the polar self-discipline fully. But the polar vortex, the annual swell of cold air, has been "unusually wonky" this year, leading to an effect known as a stratospheric warming. Former U.N. Secretary-General Kofi Annan said it was "p$3 erhaps the single most successful worldwide agreement to date" and it has been widely regarded as successful, with the ozone continuing to recover each year.

Since 2000, atmospheric levels of CFCs have been slowly declining, but they are still sufficiently abundant to cause annual ozone holes at both the South and North Pole.

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