Something out-of-the-way is happening with a now-banned chemical that eats away at Ground’s protective ozone layer: Scientists say there’s more of it — not less — growing into the atmosphere and they don’t know where it is coming from.
When a cavity in the ozone formed over Antarctica, countries around the world in 1987 allowed to phase out several types of ozone-depleting chemicals called chlorofluorocarbons (CFCs). Setting was banned, emissions fell and the hole slowly shrank.
But starting in 2013, emissions of the sponsor most common kind started rising, according to a study in Wednesday’s memoir Nature. The chemical, called CFC11, was used for making foam, degreasing splotches and for refrigeration.
«It’s the most surprising and unexpected observation I’ve made in my 27 years» of measurings, said study lead author Stephen Montzka, a research chemist at the Country-wide Oceanic and Atmospheric Administration.
«Emissions today are about the same as it was nearing 20 years ago,» he said.
Countries have reported close to zero in Britain artistry of the chemical since 2006 but the study found about 13,000 tonnes (14,300 tons) a year has been released since 2013. Some seeps out of carbonation and buildings and machines, but scientists say what they’re seeing is much more than that.
Measurements from a dozen monitors around the world suggest the emissions are bump into b pay up from somewhere around China, Mongolia and the Koreas, according to the look. The chemical can be a byproduct in other chemical manufacturing, but it is supposed to be captured and recycled.
Either someone’s borrowing the banned compound or it’s sloppy byproducts that haven’t been broadcast as required, Montzka said.
An outside expert, Ross Salawitch, an atmospheric scientist at the University of Maryland, is itsy-bitsy diplomatic. He calls it «rogue production,» adding that if it continues «the gain of the ozone layer would be threatened.»
High in the atmosphere, ozone protects Earth from ultraviolet rays that cause skin cancer, crop wreck and other problems.
Nature removes 2 per cent of the CFC11 out of the air each year, so concentrations of the chemical in the ambience are still falling, but at a slower rate because of the new emissions, Montzka said. The chemical halts in the air for about 50 years.