Airborne Observations of CFCs Over Hebei Province, China in Spring 2016 Journal of Geophysical Research: Atmospheres

In Spring 2016, 27 whole air samples were collected from an aircraft ∼500–∼3,500 m over Hebei Province, China and analyzed for 16 halocarbons, including chlorofluorocarbons (CFCs). Mixing ratios (median, 25th–75th percentiles) of CFC-11 (281, 255–318 ppt), CFC-12 (546, 473–591 ppt), CFC- 113 (79, 73–85 ppt), CFC-114 (22, 19–25 ppt), HCFC-22 (345, 308–432 ppt), and CCl4 (88, 75–104 ppt) were often observed to be higher than their global tropospheric background levels. The significantly elevated mixing ratios of ozone depleting substances (ODSs) combined with strong correlations with anthropogenic tracers known to have substantial use and emission in this region (HCFC-22 and CH2Cl2)