Warm air shrinks ozone hole to smallest size on record

Rodiano Bonacci
Ottobre 22, 2019

Unusual weather patterns within the upper atmosphere over Antarctica have caused a drastic reduction in ozone depletion, leaving the ozone with the smallest hole seen since its discovery in 1982, based on NASA and the NOAA (National Oceanic and Atmospheric Administration). "However, perceive that what we're seeing this year is because of hotter stratospheric temperatures". Though we're making growth in reducing down on the use of ozone-depleting chemical substances, the milestone doesn't imply now we salvage solved the pickle, the agencies cautioned.

The government agencies said that the hole had shrunk to 3.9 million square miles for the remainder of September and October, according to satellite data.

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.

Similar climate patterns produced unusually small ozone holes during the autumns 1988 and 2002.

The ozone layer is approximately 7 to 25 miles above the Earth's surface and acts as a "sunscreen" for the planet, NASA added. NOAA scientists stationed near the South Pole also regularly deploy high altitude weather balloons to measure the vertical dimensions of the ozone layer, or the lack there of.

The hole over the Antarctic forms throughout the Southern Hemisphere's late winter because the Sun's rays begin to cause ozone-depleting reactions. Finally, policymakers are even the use of it to deal with HFCs, ozone-depleting chemical substances which would possibly possibly well be also world-warming pollutants.

The chemistry that leads to their formation involves chemical reactions that occur on the surfaces of cloud particles that form in cold stratospheric layers, leading ultimately to runaway reactions that destroy ozone molecules. This helped prevent the loss of a considerable amount of ozone.

The weather methods that minimized ozone depletion in September, identified as "sudden stratospheric warming" events, were strangely strong this 365 days. About 19.3km above the Earth's surface, temperatures during September were 29 degrees warmer than average, NASA reported, "which was the warmest in the 40-year historical record for September by a wide margin". As well as, the reconfigured climate map helped to import ozone-rich air from different elements of the Southern Hemisphere, fairly than sealing off the polar area exclusively.

As an alternative, the Antarctic polar vortex was knocked off stability and slowed considerably, from a mean wind pace of 161 miles per hour to simply 67 miles per hour. This additionally helped enhance ozone ranges there.

Curiously, local weather change is not anticipated to trigger extra frequent sudden stratospheric warming occasions over the South Pole, and as a substitute it may strengthen, not weaken, the polar vortex general.

In a pair of news releases published Monday, scientists at NASA and NOAA confirmed that the ozone hole was the smallest in recorded history.

This swiftly resulted in a binding worldwide treaty that many experts view as the most successful environmental agreement to date.

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. "If the warming hadn't happened, we would likely be looking at a much more typical ozone hole", said Strahan.

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