Scientists Still Waiting for signs of ozone healing

Stabilize the hole in the ozone layer but will recover to fully last until about 2070, NASA according to a new study by scientists.

Chlorine levels in the atmosphere, falling as a result of the agreement , but not yet at NASA's Goddard Space Flight Center , according to scientists , the ozone hole over Antarctica each year on forming a narrowing effect not dropped below the threshold needed to . They are the American Geophysical Union in San Francisco last week presented their findings at the annual meeting .

So does not mean that the ozone hole is getting worse . But its uneven track the progress scientists still say that it is too soon to declare a recovery .

For now, each year the tropics to the polar regions of ozone variations year to year, bearing temperature and winds , the driving factors are the size of the hole .

In 2006, the ozone hole grew larger than ever . In 2012, before shrinking to its second smallest size in 2011 reached a similar size . These fluctuations usually naturally occurring , which is responsible meteorological conditions , two NASA study found.

The next two years , scientists expect the ozone hole to vary a lot more .

" This will not be a smooth ride ," Susan Strahan, a senior research scientist at NASA said. "There are some bumps in the road will be , but the general trend will be down . "

It was not until the 1990s when the chlorine level drops below a turning point between scientists in 2015 and 2030 , the phase -out of ozone depleting substances will begin to have an appreciable effect estimates.

Scientists at that rate , the project would be about a full recovery by 2070 .

Bu Haber için yorum yapabilirsiniz 19.12.2013 04:33:51 204.236.235.245

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