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2019-05-22. Rogue ozone-destroying emissions traced to northeastern China.

posted May 25, 2019, 9:51 AM by Alan Gould
By Dennis Normile, Science Magazine. [https://www.sciencemag.org/news/2019/05/rogue-ozone-destroying-emissions-traced-northeastern-china] For GSS Ozone chapter 9. Excerpt: An international team of researchers has traced the rogue use of a banned, ozone-degrading chemical to a region centered on two provinces in northeastern China. Trichlorofluoromethane (CFC-11), once a common refrigerant also used to produce building insulation, was to be phased out by 2010 under the 1987 Montreal Protocol because of its contribution to a then–rapidly growing hole in Earth’s ozone layer. As use declined ahead of the ban, atmospheric concentrations of CFC-11 started to drop. ...But in 2012, levels started to increase in the Northern Hemisphere, with evidence pointing to sources in China. Now, Matthew Rigby of the University of Bristol in the United Kingdom and colleagues have used atmospheric observations and modeling to narrow down both the source and the magnitude of emissions, showing they are coming from Shandong and Hebei provinces and represent new production and use of CFC-11. In addition, amounts have increased since the chemical was banned, the team reports today in Nature. ...“The Chinese have been doing the best they can” to identify and shut down the rogue operations, Rae says. “But regulators have real trouble keeping tabs on what is going on” throughout the country. ...“We hope that the information that this new study provided helps the Chinese government take steps to address the issue,” says Sunyoung Park, a study co-author....