Observations and emission constraints of trichlorofluoromethane (CFC-11) in southeastern China: first-year results from a new AGAGE station

Chen, Yuyang1; Yao, Bo2,3; Wu, Jing4,5; Yang, Honglong6; Ding, Ao1; Liu, Song1; Li, Xicheng1; O'Doherty, Simon7; Li, Juan1; Li, Yali1; Yu, Haibo8; Wang, Wenli8; Chen, Liqu8; Yang, Xin1,9,10; Fu, Tzung-May1,9,10; Shen, Huizhong1,9,10; Ye, Jianhuai1,9,10; Wang, Chen1,9,10; Zhu, Lei1,9,10

2024-07-01

10.1088/1748-9326/ad5857

ENVIRONMENTAL RESEARCH LETTERS   影响因子和分区

1748-9326

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 CCl3F ), 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.

Montreal Protocol CFC-11 emission southeastern China inverse modeling interspecies correlation method

SCI ; EI

英语

第一 ; 通讯

Ministry of Science and Technology of the People's Republic of China[2023YFE0112900] ; Key-Area Research and Development Program of Guangdong Province[2020B1111360001] ; Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks[ZDSYS20220606100604008] ; Guangdong Basic and Applied Basic Research Foundation[2021A1515110713] ; Guangdong University Research Project Science Team[2021KCXTD004] ; Major Talent Project of Guangdong Province[2021QN020924] ; Shenzhen Science and Technology Program["KQTD20210811090048025","JCYJ20210324104604012","JCYJ20220530115404009"] ; High level of special funds[G030290001]

Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences

Environmental Sciences ; Meteorology & Atmospheric Sciences

WOS:001253525400001

IOP Publishing Ltd

20242716565919

Chlorine compounds ; Chlorofluorocarbons ; Inverse problems ; Mixing ; Ozone ; Ozone layer

Atmospheric Properties:443.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Mathematical Statistics:922.2

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai 200438, Peoples R China
3.Fudan Univ, Inst Atmospher Sci, Shanghai 200438, Shanghai, Peoples R China
4.Beijing Jiaotong Univ, Engn Res Ctr Clean & Low Carbon Technol Intelligen, Sch Environm, Minist Educ, Beijing 100044, Peoples R China
5.Beijing Jiaotong Univ, Inst Transport Energy & Environm, Beijing 100044, Peoples R China
6.Meteorol Bur Shenzhen Municipal, Shenzhen Natl Climate Observ, Shenzhen 518040, Peoples R China
7.Univ Bristol, Sch Chem, Bristol, Glocs, England
8.Beijing Huanaco Innovat Co Ltd, Beijing 102400, Peoples R China
9.Guangdong Prov Observat & Res Stn Coastal Atmosphe, Shenzhen 518055, Guangdong, Peoples R China
10.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen Key Lab Precis Measurement & Early Warnin, Shenzhen, Guangdong, Peoples R China

Chen, Yuyang,Yao, Bo,Wu, Jing,et al. Observations and emission constraints of trichlorofluoromethane (CFC-11) in southeastern China: first-year results from a new AGAGE station[J]. ENVIRONMENTAL RESEARCH LETTERS,2024,19(7).

Chen, Yuyang.,Yao, Bo.,Wu, Jing.,Yang, Honglong.,Ding, Ao.,...&Zhu, Lei.(2024).Observations and emission constraints of trichlorofluoromethane (CFC-11) in southeastern China: first-year results from a new AGAGE station.ENVIRONMENTAL RESEARCH LETTERS,19(7).

Chen, Yuyang,et al."Observations and emission constraints of trichlorofluoromethane (CFC-11) in southeastern China: first-year results from a new AGAGE station".ENVIRONMENTAL RESEARCH LETTERS 19.7(2024).