Dozens of mysterious ozone-destroying chemicals may be undermining the recovery of the giant ozone hole over Antarctica, researchers have revealed.
The chemicals, which are also extremely potent greenhouse gases, may be leaking from industrial plants or being used illegally, contravening the Montreal protocol which began banning the ozone destroyers in 1987. Scientists said the finding of the chemicals circulating in the atmosphere showed "ozone depletion is not yesterday's story."
Until now, a total of 13 CFCs and HCFCs were known to destroy ozone and are controlled by the Montreal protocol, widely regarded as the world's most successful environmental law. But scientists have now identified and measured four previously unknown compounds and warned of the existence of many more.
"There are definitely more out there," said Dr Johannes Laube, at the University of East Anglia. "We have already picked up dozens more. They might well add up to dangerous levels, especially if we keep finding more." Laube and his colleagues are in the process of fully analysing the dozens of new compounds, but the work completed on the four new chemicals shows them to be very powerful destroyers of ozone.
Laube is particularly concerned that the atmospheric concentrations of two of the new compounds, while low now, are actually accelerating. "They are completely unimpressed by the Montreal protocol," Laube told the Guardian. "There are quite a few loopholes in the protocol and we hope some of these are tightened. But the good news is that we have picked up these [four] early." The chemicals take decades to break down in the atmosphere, meaning their impact on ozone and climate change is long-lived.
"This research highlights that ozone depletion is not yesterday's story," said Prof Piers Forster, at the University of Leeds, who was not involved in the study. "The Montreal protocol – the most successful international environmental legislation in history – phased out ozone-depleting substances from 1987 and the ozone layer should recover by 2050. Nevertheless this paper reminds us we need to be vigilant and continually monitor the atmosphere for even small amounts of these gases creeping up."
The new research, published the journal Nature Geoscience, analysed air samples captured since the mid-1970s in several ways. Air bubbles trapped in snowpack in Greenland, samples taken by scientists in Tasmania and others collected by aircraft flying 13 miles above Europe were all analysed. The team found three new CFCs and one HCFC, none of which had been identified before. "I was surprised no-one had picked these up before," said Laube. At least 74,000 tonnes of the four newly discovered chemicals have been emitted, the scientists estimate, although in the 1980s one million tonnes of other CFCs were pumped into the atmosphere every year.