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Unexplained high and persistent methyl bromide emissions in China.

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Název: Unexplained high and persistent methyl bromide emissions in China.
Autoři: Hu, Xiaoyi, Yao, Bo, Mühle, Jens, Rhew, Robert C., Fraser, Paul J., O'Doherty, Simon, Prinn, Ronald G., Fang, Xuekun
Zdroj: Nature Communications; 10/19/2024, Vol. 15 Issue 1, p1-10, 10p
Témata: OZONE layer depletion, VIENNA Convention for the Protection of the Ozone Layer (1985). Protocols, etc., 1987 Sept. 15, OZONE-depleting substances, OZONE layer, MOLE fraction, BROMOMETHANE
Abstrakt: Methyl bromide (CH3Br) is an important ozone-depleting substance whose use is regulated under the Montreal Protocol. Quantifying emissions on the national scale is required to assess compliance with the Montreal Protocol and thereby ensure the timely recovery of the ozone layer. However, the spatial-temporal patterns of China's national CH3Br emissions remain unclear. Here we estimate the national emissions of CH3Br in China during 2011−2020 using atmospheric observations at 10 sites across China combined with an inversion technique (top-down) and compare those with an updated inventory of identified emission sources (bottom-up). Measured CH3Br mole fractions are enhanced well above the background mole fractions, especially at sites in eastern China. Top-down emission estimates exceed bottom-up estimates by 5.5 ± 1.4 gigagrams per year, with the largest fraction (60%) of observationally derived CH3Br emissions arising from underestimated or unidentified emissions sources. This study shows the potential impacts of the unaccounted emissions on stratospheric ozone depletion, with implications for the Montreal Protocol. Methyl bromide (CH3Br) is an important ozone-depleting substance whose use is regulated under the Montreal Protocol. However, the spatial-temporal patterns of China's national CH3Br emissions remain unclear. Here, the authors find that China's top-down emission estimates exceed bottom-up estimates by 60%. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:Methyl bromide (CH<subscript>3</subscript>Br) is an important ozone-depleting substance whose use is regulated under the Montreal Protocol. Quantifying emissions on the national scale is required to assess compliance with the Montreal Protocol and thereby ensure the timely recovery of the ozone layer. However, the spatial-temporal patterns of China's national CH<subscript>3</subscript>Br emissions remain unclear. Here we estimate the national emissions of CH<subscript>3</subscript>Br in China during 2011−2020 using atmospheric observations at 10 sites across China combined with an inversion technique (top-down) and compare those with an updated inventory of identified emission sources (bottom-up). Measured CH<subscript>3</subscript>Br mole fractions are enhanced well above the background mole fractions, especially at sites in eastern China. Top-down emission estimates exceed bottom-up estimates by 5.5 ± 1.4 gigagrams per year, with the largest fraction (60%) of observationally derived CH<subscript>3</subscript>Br emissions arising from underestimated or unidentified emissions sources. This study shows the potential impacts of the unaccounted emissions on stratospheric ozone depletion, with implications for the Montreal Protocol. Methyl bromide (CH<subscript>3</subscript>Br) is an important ozone-depleting substance whose use is regulated under the Montreal Protocol. However, the spatial-temporal patterns of China's national CH<subscript>3</subscript>Br emissions remain unclear. Here, the authors find that China's top-down emission estimates exceed bottom-up estimates by 60%. [ABSTRACT FROM AUTHOR]
ISSN:20411723
DOI:10.1038/s41467-024-53188-3