Journal
ENVIRONMENTAL POLLUTION
Volume 310, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.119903
Keywords
Methyl chloride(CH3Cl); Anthropogenic emission; Bottom-up; China; The ozone layer; Climate change
Categories
Funding
- National Key Research and Development Program of China [2019YFC0214503]
- Key R&D Program of Zhejiang Province [2022C03154]
- Fundamental Research Funds for the Central Universities [2020QNA6015]
- National Natural Science Foundation of China [2210060183]
- Ecological Civilization Project of Zhejiang University [501100004835]
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China's anthropogenic CH3Cl emissions have shown an increasing trend in the past two decades, making a significant contribution to global anthropogenic emissions and potentially exacerbating the depletion of the ozone layer and global warming.
Methyl Chloride (CH3Cl) is the largest source of stratospheric chlorine, which has a significant impact on the depletion of the stratospheric ozone layer. Detailed information on anthropogenic CH3Cl emissions in China is still lacking. This study establishes a comprehensive bottom-up inventory of anthropogenic CH3Cl emissions in China during 2000-2020. Results show that China's anthropogenic CH3Cl emissions have increased significantly, from 34.1 +/- 11.6 Gg/yr (gigagrams per year) in 2000 to 128.5 +/- 26.5 Gg/yr in 2018 with a slight decrease to 124.9 +/- 26.0 Gg/yr in 2020. The main sources of anthropogenic emissions of CH3Cl in China are chemical production (37.1%), solvent use (35.4%), and coal combustion (13.6%) in 2020. China's contribution to global anthropogenic emissions of CH3Cl reached almost 50%. Moreover, the ratios of CH3Cl CFC-11-eq emissions relative to emissions of ozone-depleting substances (ODSs) controlled under the Montreal Protocol in China have increased from 0.8% in 2000 to 11.6% in 2020 and are estimated to continue increasing in the future. In summary, China's anthropogenic CH3Cl emissions have shown an increasing trend in the past two decades, made a huge contribution to the total global anthropogenic emissions, and presented a potential increasing impact on the depletion of the ozone layer and global warming.
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