The team used measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) combined with an atmospheric transport model to show that global atmospheric abundances and emissions of these CFCs increased after their production for most uses was phased out in 2010.
The study focused on five CFCs with few, or no, known current uses – CFC-13, CFC-112a, CFC-113a, CFC-114a, and CFC-115 – and found that their emissions were equivalent to around one quarter of a recently detected rise in emissions of CFC-11, a substance controlled under the Montreal Protocol, thought to be due to unreported new production. That’s equivalent to about one percent of the total greenhouse gas emissions in the United States,” explained Dr. “Combined, their emissions are equal to the CO2 emissions in 2020 for a smaller developed country like Switzerland. Luke Western, a research fellow at the University of Bristol and a researcher at the NOAA’s Global Monitoring Laboratory (GML), emissions from these CFCs are not currently a significant threat to ozone recovery, but they do affect the climate as potent greenhouse gases.
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