27 Apr 2022
27 Apr 2022
Status: this preprint is currently under review for the journal ACP.

A renewed rise in global HCFC-141b emissions between 2017–2021

Luke M. Western1,2, Alison L. Redington3, Alistair J. Manning3, Cathy M. Trudinger4, Lei Hu1,5, Stephan Henne6, Xuekun Fang7, Lambert J. M. Kuijpers8, Christina Theodoridi9, David S. Godwin10, Jgor Arduini11, Bronwyn Dunse4, Andreas Engel12, Paul J. Fraser4, Christina M. Harth13, Paul B. Krummel4, Michela Maione11, Jens Mühle13, Simon O'Doherty2, Hyeri Park14, Sunyoung Park14, Stefan Reimann6, Peter K. Salameh13, Daniel Say2, Roland Schmidt13, Tanja Schuck12, Carolina Siso1,5, Kieran M. Stanley12, Isaac Vimont1,5, Martin K. Vollmer6, Dickon Young2, Ronald G. Prinn15, Ray F. Weiss13, Stephen A. Montzka1, and Matthew Rigby2 Luke M. Western et al.
  • 1Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
  • 2School of Chemistry, University of Bristol, Bristol, UK
  • 3Hadley Centre, Met Office, Exeter, UK
  • 4Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, Victoria, Australia
  • 5Cooperative Institute for Research in Environmental Sciences, University of Colorado, University of Colorado, USA
  • 6Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
  • 7College of Environmental and Resource Sciences, Zhejiang University, China
  • 8A/gent b.v. Consultancy, Venlo, Netherlands
  • 9Natural Resources Defense Council, USA
  • 10Stratospheric Protection Division, Environmental Protection Agency, Washington, DC, USA
  • 11Department of Pure and Applied Sciences, University of Urbino, Urbino, Italy
  • 12Institute for Atmospheric and Environmental Science, Goethe University Frankfurt, Frankfurt am Main, Germany
  • 13Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
  • 14Department of Oceanography, Kyungpook National University, Daegu, Republic of Korea
  • 15Center for Global Change Science, Massachusetts Institute of Technology, Cambridge, MA, USA

Abstract. Global emissions of the ozone depleting gas 1,1-dichloro-1-fluoroethane (HCFC-141b, CH3CCl2F), derived from measurements of atmospheric mole fractions, have been rising between 2017–2021 despite a fall in reported production and consumption for dispersive uses. This study evaluates the possible drivers behind this renewed rise in emissions. HCFC-141b is a controlled substance under the Montreal Protocol, and its phase-out is currently underway, after a peak in reported consumption and production in developing countries (Article 5) in 2013. If reported production and consumption are correct, it suggests that the 2017–2021 rise is due to an increase in emissions from the bank when HCFC-141b containing appliances reach the end of their life, or from production of HCFC-141b not reported for dispersive uses. Regional emissions have been estimated between 2017–2020 for all regions where measurements have sufficient sensitivity to emissions. This includes the regions of northwestern Europe, east Asia, the USA and Australia, where emissions decreased by a total of 1.6 ± 3.9 Gg yr−1, compared to a mean global increase of 3.0 ± 1.2 Gg yr−1 over the same period. Collectively these regions only account for around a third of global emissions in 2020. Therefore we are not able to pinpoint the source regions or specific activities responsible for the recent global emission rise.

Luke M. Western et al.

Status: open (until 08 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-298', Anonymous Referee #1, 19 May 2022 reply

Luke M. Western et al.

Luke M. Western et al.


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Latest update: 26 May 2022
Short summary
The production of ozone destroying gases is being phased out. Even though production of one of the main ozone depleting gases, called HCFC-141b, has been declining for many years, the amount that is being released to the atmosphere has been increasing since 2017. We do not know for sure why this is. A possible explanation is that HCFC-141b that was used to make insulating foams many years ago is only now escaping to the atmosphere, or a large part of its production is not being reported.