Author Topic: Ozone hole is healing  (Read 719 times)

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need_boost

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Ozone hole is healing
« on: May 12, 2015, 09:59:50 am »
http://www.businessinsider.com/antarctic-ozone-hole-is-healing-2015-5

Now that summer is here, you'll likely be slathering up with sunscreen.

Earth, it turns out, is doing the same, according to an encouraging study recently published by a team of scientists at NASA Goddard Space Flight Center and Goddard Earth Sciences Technology and Research at the Universities Space Research Association.

Earth has its own layer of sunscreen called the ozone layer, or ozone shield, which makes up part of the stratosphere and absorbs most of the sun's ultra-violet (UV) radiation. But it doesn't absorb all of the UV light, and what gets through can cause skin cancer and cataracts in humans as well as reproductive problems in fish, crabs, and frogs.

Since 1983, scientists have observed a scary phenomenon: Earth's ozone was extremely weak over parts of Antarctica, letting in bouts of harmful UV radiation. The reason, in part, was because a series of man-made chemicals namely chlorine and bromine were eating away the planet's protective, sunscreen-like layer.

They called this weaker region Antarctica's ozone hole. Although the hole's size varies each year, it has been consistently larger than 8 million square miles since 1990 more than twice the size of the entire United States!

In recent years, scientific reports have noted that the hole is slowly healing thanks to a decrease in ozone-depleting chemicals in the atmosphere but scientists were not sure when the hole would be completely regenerated.

Now, according to a study published in journal Geophysical Research: Atmospheres, the hole should finally, permanently shrink below 8 million square miles by 2040s and could even be fully recovered by the end of the century.

The source of the problem

For the middle half of the 20th Century, companies used ozone-depleting chemicals, called chlorofluorocarbons (CFCs), in refrigerators and aerosol sprays that, through use, were getting released into the atmosphere. By the early '80s scientists were beginning to understand the damage that these chemicals were doing to the planet.

When CFCs float up to the troposphere, above the ozone, they interact with UV radiation from the sun releasing chlorine, which destroys ozone. As a result of this discovery, an international treaty called the Montreal Protocol was enacted in 1989 that began phasing out the production and subsequent emission of ozone-depleting chemicals.

By that point, however, the damage had been done.

These chemicals can hang out in the atmosphere for years after they've entered the atmosphere. Like a series of dominoes, the ozone hole continued to grow even after CFCs were banned. Here's a chart showing the size of the ozone hole, in blue, from 1979 through 2012:

Ozone depletion above the planet's north and south poles was exceptionally bad because Earth's wind currents were sweeping the chemicals toward either end of the planet.

Once these chemicals reached the poles, a large-scale cyclone, called the polar vortex, was trapping the chemicals where they accumulated over time to high concentrations, ravenously eating away the ozone (see the GIF below). This led to the Antarctic ozone hole as well as the Arctic ozone hole, which in 2011 reportedly had half the ozone it used to.


Read more: http://www.businessinsider.com/antarctic-ozone-hole-is-healing-2015-5#ixzz3Zw8Csxm5

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Beavis in KC

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Re: Ozone hole is healing
« Reply #1 on: May 12, 2015, 10:00:15 am »
 :lol NASA
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Snakeeyes

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Re: Ozone hole is healing
« Reply #2 on: May 12, 2015, 10:00:49 am »
These scientists clearly have an agenda - I don't believe their data!!
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Snakeeyes

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Re: Ozone hole is healing
« Reply #3 on: May 12, 2015, 10:06:37 am »

In recent years, scientific reports have noted that the hole is slowly healing thanks to a decrease in ozone-depleting chemicals in the atmosphere but scientists were not sure when the hole would be completely regenerated.


So wait - these scientists found that protecting the environment WORKS?!?  This is truly shocking news.
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need_boost

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Re: Ozone hole is healing
« Reply #4 on: May 12, 2015, 10:07:41 am »
:lol testudo:  snake ... before he was a teacher. was a student. that's it. Life story in 20 words or leses
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Cam

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Re: Ozone hole is healing
« Reply #5 on: May 12, 2015, 10:29:29 am »
Climate change is natural..


/thread
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Re: Ozone hole is healing
« Reply #6 on: May 12, 2015, 10:57:17 am »
Who the fvck goes to Antarctica to get a suntan?

Tell me when it reaches South Carolina, then I will start to think about giving a shit.

:lol Ozone
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Saluki

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Re: Ozone hole is healing
« Reply #7 on: May 18, 2015, 01:33:35 pm »
I remember people raising holy hell when CFCs and other types of aerosols got bant.
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Rob in VB

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Re: Ozone hole is healing
« Reply #8 on: May 18, 2015, 01:36:01 pm »
Where you been, Saluki?
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Saluki

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Re: Ozone hole is healing
« Reply #9 on: May 18, 2015, 01:36:42 pm »
Where you been, Saluki?

Doing stuff and things :uhh
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Snakeeyes

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Re: Ozone hole is healing
« Reply #10 on: May 18, 2015, 03:11:42 pm »
Doing stuff

I call bullshit.   referee1
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Re: Ozone hole is healing
« Reply #11 on: May 18, 2015, 03:20:58 pm »
Hopefully he was getting his teeth fixed
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