Constraining Trifluoromethane (HFC-23) Emission in Eastern China Based on Two-Year Online Measurements
文献类型：期刊论文
| 作者 | Huang, Xiaoqing1,3,4; Zhang, Yanli1,3,4 ; Xiao, Chunlin2; Song, Wei1,4; Wang, Yi1,3,4; Wang, Xinming1,3,4
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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| 出版日期 | 2024-05-16 |
| 卷号 | 129期号:9页码:11 |
| 关键词 | trifluoromethane (HFC-23) fluorinated gases (F-gases) greenhouse gases source region emission estimate eastern China |
| ISSN号 | 2169-897X |
| DOI | 10.1029/2023JD040199 |
| 英文摘要 | Trifluoromethane (CHF3, HFC-23) is one of the most potent greenhouse gases (GHGs), and eastern China has been recognized as a major source region, yet highly inconsistent emission estimates warrant more extensive studies. In this study, we conducted 2-year online measurements of halocarbons during 2021-2023 at an urban site in the Pearl River Delta region. The observed average HFC-23 mixing ratios of 43.6 +/- 7.8 ppt were similar to 20% enhanced compared to observations at the Mace Head global baseline station. Unlike other halocarbons with significant local emissions, HFC-23 mixing ratios showed distinct seasonal variations with peak values in winter and bottom values in summer. Similar seasonal patterns and highly significant correlation were observed between HFC-23 and perfluorocyclobutane (c-C4F8, PFC-318), a co-product from manufacturing PTFE using chlorodifluoromethane (CHClF2, HCFC-22) as feedstock. The weighted potential source contribution function analysis also demonstrated eastern China was the major source area for both HFC-23 and PFC-318. Tracer-based estimation revealed HFC-23 emissions of 6.7 +/- 3.1 Gg yr-1 (equivalent to 98 Tg-CO2 yr-1 or 0.7% China's annual GHG emissions in 2021) in eastern China. Our results highlight the importance of HFC-23 emission control in eastern China for China's GHG and F-gases emission reductions, and suggest that greater attention should be given to HFC-23 emissions from PTFE production, which is emerging as a more substantial source than previously anticipated. Trifluoromethane, also known as HFC-23, is a very strong greenhouse gas produced unintentionally during the manufacturing of chlorodifluoromethane (HCFC-22). It is among target fluorine-containing greenhouse gases whose emissions should be controlled under the Kigali Amendment. While a lot of HFC-23 is believed to come from eastern China, it is hard to say exactly how much. From 2021 to 2023, we measured HFC-23 and other fluorinated gases in air at an urban site in the Pearl River Delta region. We found HFC-23 levels were about 20% higher than that at global background sites. We noticed that HFC-23 and another gas called perfluorocyclobutane (PFC-318), which is a co-product when manufacturing PTFE with HCFC-22, were strongly linked and both had seasonal patterns quite different from other fluorinated gases. Our analysis shows that PFC-318 and HFC-23 mostly come from eastern China. By using PFC-318 as a tracer, we estimated the amount of HFC-23 emissions in eastern China at 6.7 +/- 3.1 Gg yr-1, making up a small but important part of China's overall greenhouse emissions. This highlights the need to lower HFC-23 emissions, particularly those from the process of making PTFE with HCFC-22. HFC-23 mixing ratios measured online during 2021-2023 were 43.6 +/- 7.8 ppt, similar to 20% higher than that at the Mace Head baseline station HFC-23 emissions mainly occurred in eastern China with estimated emissions of 6.7 +/- 3.1 Gg yr-1 during 2021-2023 Feedstock use of HCFC-22 for producing PTFE is emerging as an increasingly significant emission source of HFC-23 |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:001264028200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78318]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Zhang, Yanli; Wang, Xinming |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect & Resources Uti, Guangzhou, Peoples R China 2.South China Agr Univ, Coll Mat & Energy, Guangzhou, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Xiaoqing,Zhang, Yanli,Xiao, Chunlin,et al. Constraining Trifluoromethane (HFC-23) Emission in Eastern China Based on Two-Year Online Measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2024,129(9):11. |
| APA | Huang, Xiaoqing,Zhang, Yanli,Xiao, Chunlin,Song, Wei,Wang, Yi,&Wang, Xinming.(2024).Constraining Trifluoromethane (HFC-23) Emission in Eastern China Based on Two-Year Online Measurements.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,129(9),11. |
| MLA | Huang, Xiaoqing,et al."Constraining Trifluoromethane (HFC-23) Emission in Eastern China Based on Two-Year Online Measurements".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 129.9(2024):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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