Observations and emission constraints of trichlorofluoromethane (CFC-11) in southeastern China

First-year results from a new Agage station

Bibliographic Data

ID15550488
AuthorsYuyang Chen (0000-0002-5220-0501, Southern University of Science and Technology), Bo Yao (0000-0003-1852-2774, Fudan University), Jing Wu (0000-0002-6559-4335, Beijing Jiaotong University), Honglong Yang (Meteorological Bureau of Shenzhen Municipality), Ao Ding (0000-0002-7584-7949, Southern University of Science and Technology), Song Liu (0000-0002-2248-4283, Southern University of Science and Technology), Xicheng Li (0000-0003-0342-7264, Southern University of Science and Technology), Simon O’Doherty (0000-0002-4051-6760, University of Bristol), Juan Li (0000-0002-8639-6100, Harbin Institute of Technology), Yali Li (0000-0001-7950-9448, Southern University of Science and Technology), Haibo Yu (0009-0003-3445-4297), Wenli Wang (0000-0001-5664-0056), Liqu Chen, Xin Yang (0000-0002-0154-737X, Southern University of Science and Technology), Tzung‐May Fu (0000-0002-8556-7326, Southern University of Science and Technology), Tzung-May Fu, Huizhong Shen (0000-0003-1335-8477, Southern University of Science and Technology), Jianhuai Ye (0000-0002-9063-3260, Southern University of Science and Technology), Chen Wang (0000-0003-3042-291X, Southern University of Science and Technology), Lei Zhu (0000-0003-1237-2920, Southern University of Science and Technology, corresponding author)
Year2024
Volume19
Issue7
Pages074043-074043
Publication date2024-06-17
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueEnvironmental Research Letters (JOURNAL)
Journal identifiersISSN: 1748-9326 • E-ISSN: 1748-9326
PublisherIOP Publishing (PUBLISHER • GB)
DOI10.1088/1748-9326/ad5857
OpenAlexW4399747860
LanguageEN
References cited51

The recovery of the ozone layer relies on decreasing atmospheric mixing ratios of ozone-depleting substances (ODSs), including chlorofluorocarbons (CFCs). A significant decline in the mixing ratio of trichlorofluoromethane (CFC-11 or CCl 3 F ), the second most abundant CFC, has been observed since the mid-1990s. However, a slowdown in the decline after 2012 indicates a rise in emissions, particularly in Eastern Asia. Ground-based observations are lacking in southeastern China, limiting a thorough evaluation of CFC-11 levels and emissions in this region. A new Advanced Global Atmospheric Gases Experiment background station was established at Xichong (XCG), Shenzhen, China, to provide high-frequency continuous in situ observations. The annual mean CFC-11 mixing ratio, recorded from May 2022 to April 2023, is 221.64 ± 2.29 ppt. When compared with a monthly (MHD) or daily (MLO) observation, this value is found to be 0.45% to 5.36% higher than the northern hemispheric background. With the inverse modeling and interspecies correlation method, we estimate CFC-11 emissions in southeastern China between 1.23 ± 0.25 Gg yr −1 and 1.58 ± 0.21 Gg yr −1 , in line with the bottom-up estimation of 1.50 Gg yr −1 . Results indicate that CFC-11 emissions in the Pearl River Delta region have returned to levels before 2010, aligning with regional and global trends. Observations from XCG would compensate for the deficiency of CFC-11 measurements in southeastern China, paving the road for ODS studies in this region and beyond

Archaeology · China · Climatology · Geography · Meteorology · Atmospheric and Environmental Gas Dynamics · Atmospheric Ozone and Climate · Environmental Science · Methane Hydrates and Related Phenomena · Geology

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