Declined Levels of Chlorine Are Resulting in Lower Depletion of Ozone Layer

Scientists are fueling the international ban on artificial chemicals consisting chlorine, as holes in the ozone layer at upper atmosphere have been shrinking since 2005 by nearly 20 per cent.

The left chlorine in atmosphere, known as chlorofluorocarbons is the major chemical contributors to forming holes in the armored Ozone layer surrounding the earth. Hence, the scientists from the US National Aeronautics and Space Administration (NASA) have credited the global ban on manmade chlorine in order to bring the protective ozone layer back.

A United Nations emergency committee prohibited the use of chlorofluorocarbons (CFCs) under the Montreal Protocol around 30 years ago. And now, scientists for the first time have stated after the thorough analyses of ozone hole using a satellite instrument constructed by NASA Jet Propulsion Laboratory (JPL) that the levels of chlorine are decreasing and lowering the ozone depletion.

The research has published in the Geophysical Research Letters journal on Thursday, which is first to measure chemical composition within the ozone hole to prove that the ozone depletion is decreasing and the decrease is happening because of decline in CFCs.

Atmospheric scientist and lead author Susan Strahan from NASA Goddard Space Flight Center in Greenbelt in Marylandm said in a statement that, “We see very clearly that chlorine from CFCs is going down in the ozone hole, and that less ozone depletion is occurring because of it.”

Study’s co-author and a fellow atmospheric scientist from the Goddard, Anne Douglass said that, “CFCs have lifetimes from 50 to 100 years, so they linger in the atmosphere for a very long time. As far as the ozone hole being gone, we’re looking at 2060 or 2080. And even then there might still be a small hole.”



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