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• W4246592145 abstract "Abstract. We report a 40-year history of SF6 atmospheric mole fractions measured at the Advanced Global Atmospheric Gases Experiment (AGAGE) monitoring sites, combined with archived air samples to determine emission estimates from 1978–2018. Previously we reported a global emission rate of 7.3 ± 0.6 Gigagrams (Gg) yr−1 in 2008 and over the past decade emissions have continued to increase by about 24 % to 9.04 ± 0.35 Gg yr−1 in 2018. We show that changing patterns in SF6 consumption from developed (Kyoto Protocol Annex-1) to developing countries (non-Annex-1) and the rapid global expansion of the electric power industry, mainly in Asia, have increased the demand for SF6-insulated switchgear, circuit breakers and transformers. The large bank of SF6 sequestered in this electrical equipment provides a substantial source of emissions from maintenance, replacement and continuous leakage. Other emissive sources of SF6 occur from the magnesium, aluminium, electronics industries and more minor industrial applications. More recently, reported emissions, including those from electrical equipment and metal industries, primarily in the Annex-1 countries, have steadily declined through substitution of alternative blanketing gases and technological improvements in less emissive equipment and more efficient industrial practices. Conversely, in the non-Annex-1 countries SF6 emissions have increased due to an expansion in the growth of the electrical power, metal and electronics industries to support their development. There is an annual difference of 2.5–5 Gg yr−1 (1990–2018) between our modelled top-down emissions and the UNFCCC reported bottom-up emissions, which we attempt to reconcile through analysis of the potential contribution of emissions from the various industrial applications which use SF6. We also investigate regional emissions in East Asia (China, S. Korea) and Western Europe and their respective contributions to the global atmospheric SF6 inventory. On an average annual basis, our estimated emissions from the whole of China are approximately 10 times greater than emissions from Western Europe. In 2018, our modelled Chinese and Western European emissions accounted for ~ 36 % and 3.1 %, respectively, of our global SF6 emissions estimate." @default.
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• W4246592145 date "2020-03-11" @default.
• W4246592145 modified "2023-10-16" @default.
• W4246592145 title "The increasing atmospheric burden of the greenhouse gas sulfur hexafluoride (SF₆)" @default.
• W4246592145 doi "https://doi.org/10.5194/acp-2020-117" @default.
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