Ozone Layer Closing Up Because Humans Did Something about It

Monday, January 8, 2018 - 16:40

A new NASA study based on data from the Aura satellite confirms the success, so far, through measuring the chemicals that caused the hole in the first place.

The study, published Thursday in Geophysical Research Letters, reveals that a decline in ozone-depleting chemicals has resulted in 20 percent less depletion since 2005. Specifically chlorine levels declined by 0.8 percent each year between 2005 and 2016.

"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," said lead author Susan Strahan, an atmospheric scientist from NASA's Goddard Space Flight Centre in Maryland, US.

CFCs are long-lived chemical compounds that eventually rise into the stratosphere, where they are broken apart by the Sun's ultraviolet radiation, releasing chlorine atoms that go on to destroy ozone molecules.

Stratospheric ozone protects life on the planet by absorbing potentially harmful ultraviolet radiation that can cause skin cancer and cataracts, suppress immune systems and damage plant life.

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کد خبر: 615242 0 0

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