Concentrations and emissions of trichlorotrifluoroethane (CFC-113) from eastern china inferred from atmospheric observations

Abstract Trichlorotrifluoroethane (C 2 Cl 3 F , CFC-113) is a long-lived ozone-depleting substance (ODS) regulated under the Montreal Protocol and potent greenhouse gas (GHG). Production consumption of chlorofluorocarbons (CFCs) were phased out after 2007 in China, while unexpected increases CCl (CFC-11) emissions from eastern China 2012 inferred atmospheric observations. However, concentrations CFC-113 over past few years are unclear. In this study, we conducted hourly observation 2021 explored potential emission sources using dispersion model, estimated an interspecies correlation method. Results show that pollution events observed frequently, higher than those global background stations with similar latitudes. The dominant regions located eastern-central Yangtze River Delta region Shandong province. mean was 0.88 ± 0.19 Gg/yr (5350 1155 CO -equivalent Gg/yr), which 0 (0 Gg/yr) 2008−2021, as reported by bottom-up studies considered to be 2007. Therefore, substantial still existed 2021, importance protecting ozone layer mitigating effects climate change.