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A renewed rise in global HCFC-141b emissions between 2017-2021
Luke M Western1,2, Alison L Redington3, Alistair J Manning3
1Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA.
Atmospheric Chemistry and Physics
|September 24, 2024
Summary
Global emissions of the ozone-depleting gas HCFC-141b increased from 2017-2021. This rise may stem from end-of-life appliance emissions or unreported production, despite Montreal Protocol phase-outs.
Area of Science:
- Atmospheric Chemistry and Physics
- Environmental Science
- Ozone Layer Protection
Background:
- HCFC-141b (1,1-dichloro-1-fluoroethane) is an ozone-depleting substance regulated under the Montreal Protocol.
- Global phase-out of HCFC-141b is ongoing, with a peak in reported consumption in developing countries in 2013.
Purpose of the Study:
- To investigate the discrepancy between reported HCFC-141b production/consumption and observed atmospheric emissions.
- To quantify regional and global emission trends of HCFC-141b between 2017 and 2021.
Main Methods:
- Analysis of atmospheric mole fraction measurements to derive global HCFC-141b emissions.
- Estimation of regional emissions for areas with sufficient measurement sensitivity (e.g., Europe, East Asia, USA, Australia).
Main Results:
- Global HCFC-141b emissions increased by 3.0 ± 1.2 Gg yr⁻¹ between 2017 and 2021.
- Emissions in northwestern Europe, East Asia, the United States, and Australia decreased by 2.3 ± 4.6 Gg yr⁻¹ during 2017-2020.
- These specific regions accounted for only ~30% of global emissions in 2020.
Conclusions:
- The observed rise in global HCFC-141b emissions suggests potential underreporting of production or increased emissions from "banks" (e.g., old appliances).
- The source regions and specific activities driving the global emission increase remain unidentified.
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