First direct proof of ozone hole recovery due to chemicals ban

January 4, 2018 by Samson Reiny, NASA's Goddard Space Flight Center
A view of Earth's atmosphere from space. Credit: NASA

For the first time, scientists have shown through direct satellite observations of the ozone hole that levels of ozone-destroying chlorine are declining, resulting in less ozone depletion.

Measurements show that the decline in , resulting from an international ban on chlorine-containing manmade chemicals called chlorofluorocarbons (CFCs), has resulted in about 20 percent less during the Antarctic winter than there was in 2005—the first year that measurements of chlorine and ozone during the Antarctic winter were made by NASA's Aura satellite.

"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 Center in Greenbelt, Maryland.

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.

Two years after the discovery of the Antarctic ozone hole in 1985, nations of the world signed the Montreal Protocol on Substances that Deplete the Ozone Layer, which regulated ozone-depleting compounds. Later amendments to the Montreal Protocol completely phased out production of CFCs.

Past studies have used statistical analyses of changes in the ozone hole's size to argue that ozone depletion is decreasing. This study is the first to use measurements of the chemical composition inside the ozone hole to confirm that not only is ozone depletion decreasing, but that the decrease is caused by the decline in CFCs.

The study was published Jan. 4 in the journal Geophysical Research Letters.

The Antarctic ozone hole forms during September in the Southern Hemisphere's winter as the returning sun's rays catalyze cycles involving chlorine and bromine that come primarily from CFCs. To determine how ozone and other chemicals have changed year to year, scientists used data from the Microwave Limb Sounder (MLS) aboard the Aura satellite, which has been making measurements continuously around the globe since mid-2004. While many satellite instruments require sunlight to measure atmospheric trace gases, MLS measures microwave emissions and, as a result, can measure trace gases over Antarctica during the key time of year: the dark southern winter, when the stratospheric weather is quiet and temperatures are low and stable.

The change in above Antarctica from the beginning to the end of southern winter—early July to mid-September—was computed daily from MLS measurements every year from 2005 to 2016. "During this period, Antarctic temperatures are always very low, so the rate of ozone destruction depends mostly on how much chlorine there is," Strahan said. "This is when we want to measure ."

They found that ozone loss is decreasing, but they needed to know whether a decrease in CFCs was responsible. When ozone destruction is ongoing, chlorine is found in many molecular forms, most of which are not measured. But after chlorine has destroyed nearly all the available ozone, it reacts instead with methane to form hydrochloric acid, a gas measured by MLS. "By around mid-October, all the chlorine compounds are conveniently converted into one gas, so by measuring hydrochloric acid we have a good measurement of the total chlorine," Strahan said.

Nitrous oxide is a long-lived gas that behaves just like CFCs in much of the stratosphere. The CFCs are declining at the surface but nitrous oxide is not. If CFCs in the stratosphere are decreasing, then over time, less chlorine should be measured for a given value of nitrous oxide. By comparing MLS measurements of hydrochloric acid and nitrous oxide each year, they determined that the total chlorine levels were declining on average by about 0.8 percent annually.

The 20 percent decrease in ozone depletion during the winter months from 2005 to 2016 as determined from MLS ozone measurements was expected. "This is very close to what our model predicts we should see for this amount of chlorine decline," Strahan said. "This gives us confidence that the decrease in ozone depletion through mid-September shown by MLS data is due to declining levels of chlorine coming from CFCs. But we're not yet seeing a clear decrease in the size of the ozone hole because that's controlled mainly by temperature after mid-September, which varies a lot from year to year."

Looking forward, the Antarctic hole should continue to recover gradually as CFCs leave the atmosphere, but complete recovery will take decades. "CFCs have lifetimes from 50 to 100 years, so they linger in the atmosphere for a very long time," said Anne Douglass, a fellow atmospheric scientist at Goddard and the study's co-author. "As far as the being gone, we're looking at 2060 or 2080. And even then there might still be a small hole."

Explore further: Warm air helped make 2017 ozone hole smallest since 1988

More information: Susan E. Strahan et al. Decline in Antarctic Ozone Depletion and Lower Stratospheric Chlorine Determined From Aura Microwave Limb Sounder Observations, Geophysical Research Letters (2018). DOI: 10.1002/2017GL074830

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Jan 04, 2018
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2.3 / 5 (3) Jan 05, 2018
The part which is oftentimes left out of the reporting on this subject is that there are variable vertical winds occurring at the upper atmosphere (thermosphere) in these regions.

Nonsense! And does it even matter??? What the successful emergency repair of the ozone-hole demonstrates is that global science effecting global policies can effect and impact global environmental systems. If industry was left to it's own, the ozone layer would be gone and the worlds would have gone extinct from UV poisoning.
Jan 06, 2018
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2.3 / 5 (6) Jan 08, 2018
First direct proof of ozone hole recovery due to chemicals ban

Should read:

More proof that chemicals ban hasn't affected ozone hole

The complicated chemical reactions used to assign ozone hole blame on CFCs was always suspect and this report further establishes that the Montreal Protocol was based on a dubious, still unproven premise.

The fact that they can measure a 20% decline in atmospheric chlorine (thanks to the Montreal Protocol) but still can't measure any difference in ozone hole size demonstrates that the theory of a causal relationship between CFCs and ozone hole size is still just that: a theory. If there is a causal relationship, it's apparently so insignificant that no one has been able to measure it yet even after 30 years. And the nations of the world bet billions of dollars on that. Brilliant.
4.4 / 5 (7) Jan 08, 2018
I don't know why there is an ideological movement against international cooperation. What is there to gain from such unproductive conflict? No freedom, no prosperity, no peace comes from this isolationist absurdity.

The science confirms that positive human action can undo the side-effects of human action.
4.2 / 5 (5) Jan 12, 2018
I think you Ozone Hole *deniers* need to really rethink your arguments. I think the science community is pretty clear on CFC's impact on the upper atmosphere's Ozone. Based on how quickly the Ozone layer was being depleted, it was imperative to remove all CFCs from the atmosphere, or else the hole would have grown and grown very quickly until the Earth was stripped of it's protective ozone layer (and consequently destroying most surface life from UV poisoning). The fact that the Ozone hole is shrinking demonstrates that working together and doing proper regulation is effective and good policy.

A similar global unity effort needs to happen with CO2 reduction. Usage of Oil/Gas/Coal all need to be reduced to a background level immediately for the next 1500 years (the lifetime of CO2 in the atmosphere). Or else its trillions of dollars of global disasters. You right wing flat-earthers need to decide that one.

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