What is an ozonosphere ?


The ozonosphere may be a district within the Earth’s stratosphere that absorbs the sun’s ultraviolet rays, shielding the world from the harmful radiation which could cause carcinoma. Within the 1970s, scientists discovered that the ozonosphere was being depleted because of man-made activities, thereby leading to a threat to life on Earth. 


Why was the massive Hole in Artic formed ?

In 2017, NASA announced that the hole was the weakest since 1988 thanks to warm stratospheric conditions. In March, scientists had noticed signs of a hole forming within the ozonosphere above the pole and thought it had been the results of low temperatures. it's believed to be the largest hole within the ozonosphere and would have led to a good bigger threat if it moved toward the south. Polar stratospheric clouds (PSC) form more readily within the extreme cold of the Arctic and Antarctic stratosphere. this is often why ozone holes first formed, and are deeper, over Antarctica.




Although due to some events like the prevailing lockdown due to Corona-Virus the hole near the Arctic circle has shut, as per records. the outlet was first identified by scientists in March this year. The Copernicus Climate Service (C3S) and Copernicus Atmosphere Monitoring Service (CAMS) by the European Centre for Medium-Range Weather Forecasts (ECMWF) confirmed the event.


The graphs above show the progress of the hole for 2019. the grey shading indicates the best and lowest values measured since 1979. The red numbers are the most or minimum values. The stratospheric temperature and also the amount of sunlight reaching the south polar region control the depth and size of the Antarctic hole. The dashed line within the minimum temperature plot indicates the temperature below which sort I (NAT) PSCs can form./em>


Is the ozone layer healing ?

A new study suggests the Montreal Protocol - the 1987 agreement to prevent producing ozone-depleting substances (ODSs) - may be accountable for pausing, or perhaps reversing, some troubling changes in air currents around the hemisphere. 

Swirling towards our planet's poles at a high altitude are fast air currents referred to as jet streams. Before the turn of the century, ozone depletion had been driving the southern airstream further south than usual. This ended up changing rainfall patterns, and potentially ocean currents also. 

However, scientists have confirmed that the 1 million square kilometer-wide hole within the ozonosphere has healed. They added that the closing of the outlet wasn't thanks to the reduced levels of pollution during the coronavirus lockdown. it's believed that the polar vortex, the high-altitude currents that are accountable for bringing cold air to the polar regions, is accountable for the healing of the layer.
The graphs above show the variations of ozone from year to year. The red bars indicate the biggest area and therefore the lowest minimum value. The year-to-year fluctuations are superimposed on a trend extending over the last three decades.


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