By Chuck Parsons
NASA scientists said the ozone hole over the Arctic had surpassed the record thin of 40 percent in 2011.
A very strong polar vortex, according to NASA, trapped the cold air over the North Pole had formed clouds at the stratosphere. The Earth’s ozone lies at the stratosphere, which is about 10 up to 50 kilometers above the Earth.
The chlorofluorocarbons and hydrochloroflourocarbons in these clouds produced bromine and chlorine atoms as the ultraviolet rays from the sun hit them. These atoms had depleted the ozone layer.
This phenomenon is common in the South Pole where scientists observed larger hole in the ozone layer.
During the spring in the South Pole, this ozone layer could thin as much as 70 percent.
In the North, thinning of the ozone layer also happens.
But the more than average thinning of the ozone over the Arctic is not common where the average temperature is warmer than the South Pole.
In 2011, the Arctic’s ozone dropped to 40 percent.
This year’s record had surpassed the 2011 event where the thinning covered almost a million square kilometers. (Mindanao Sun)
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