A128-12
Recent estimates of changes in the emissions of CFC-11 and related ozone-depleting substances from eastern China

Friday, 11 December 2020: 11:03
Virtual
Luke Western1, Sunyoung Park2, Takuya Saito3, Alison Redington4, Stephan Henne5, Xuekun Fang6, Ronald G Prinn6, Alistair Manning7, Stephen A Montzka8, Paul J. Fraser9, Anita Ganesan10, Christina M Harth11, Jooil Kim12, Paul B Krummel13, Qing Liang14, Jens Muhle12, Simon O'Doherty1, Hyeri Park2, Mi-Kyung Park15, Stefan Reimann5, Peter Salameh12, Ray F Weiss16 and Matthew L Rigby17, (1)University of Bristol, School of Chemistry, Bristol, United Kingdom, (2)Kyungpook National University, Daegu, South Korea, (3)Natl Inst Environal Study, Tsukuba, Japan, (4)UK Meteorological Office, Exeter, United Kingdom, (5)Empa, Duebendorf, Switzerland, (6)MIT, Cambridge, MA, United States, (7)UK Meteorological Office, Climate Research, Exeter, United Kingdom, (8)NOAA/ESRL Global Monitoring Division, Boulder, CO, United States, (9)CSIRO, Oceans and Atmosphere, Aspendale, Victoria, Australia, (10)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (11)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (12)Scripps Institution of Oceanography, La Jolla, CA, United States, (13)CSIRO, Aspendale, Australia, (14)NASA GSFC, Atmospheric Chemistry and Dynamic Laboratory, Code 614, Greenbelt, MD, United States, (15)Kyungpook National University, Kyungpook Institute of Oceanography, Daegu, Korea, Republic of (South), (16)Univ California San Diego, La Jolla, CA, United States, (17)University of Bristol, Bristol, United Kingdom
Abstract:
Recently it was shown that emissions of trichlorofluoromethane (CFC-11, CCl3F) – a banned substance under the Montreal Protocol due to its ozone depleting properties – began to rise again in 2013, three years after its global production phase-out mandated by the Montreal Protocol on Substances that Deplete the Ozone Layer. Atmospheric observations from eastern Asia showed that at least 40 - 60% of the global rise originated from eastern China, where emissions increased by 7 ± 3 Gg yr-1 during 2014 - 2017 compared to 2008 – 2012. Here, we discuss updated emissions estimates of CFC-11 from this region extended to subsequent years. In addition, we present emissions estimates for the related ozone-depleting substances carbon tetrachloride (CCl4) and dichlorodifluoromethane (CFC-12, CCl2F2), which are typically the precursor to and co-product to CFC-11, respectively. Emissions trends for these three compounds are examined to understand if they shine additional light on excess production of CFC-11 in this region in recent years.
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