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DOI | 10.5194/acp-21-6365-2021 |
Mapping the drivers of formaldehyde (HCHO) variability from 2015 to 2019 over eastern China: Insights from Fourier transform infrared observation and GEOS-Chem model simulation | |
Sun Y.; Yin H.; Liu C.; Zhang L.; Cheng Y.; Palm M.; Notholt J.; Lu X.; Vigouroux C.; Zheng B.; Wang W.; Jones N.; Shan C.; Qin M.; Tian Y.; Hu Q.; Meng F.; Liu J. | |
发表日期 | 2021 |
ISSN | 1680-7316 |
起始页码 | 6365 |
结束页码 | 6387 |
卷号 | 21期号:8 |
英文摘要 | The major air pollutant emissions have decreased, and the overall air quality has substantially improved across China in recent years as a consequence of active clean air policies for mitigating severe air pollution problems. As key precursors of formaldehyde (HCHO) and ozone (O3), the volatile organic compounds (VOCs) in China are still increasing due to the lack of mitigation measures for VOCs. In this study, we investigated the drivers of HCHO variability from 2015 to 2019 over Hefei, eastern China, by using ground-based high-resolution Fourier transform infrared (FTIR) spectroscopy and GEOS-Chem model simulation. Seasonal and interannual variabilities of HCHO over Hefei were analyzed and hydroxyl (OH) radical production rates from HCHO photolysis were evaluated. The relative contributions of emitted and photochemical sources to the observed HCHO were analyzed by using ground-level carbon monoxide (CO) and Ox (O3 Cnitrogen oxide (NO2)) as tracers for emitted and photochemical HCHO, respectively. Contributions of emission sources from various categories and geographical regions to the observed HCHO summer-time enhancements were determined by using a series of GEOS-Chem sensitivity simulations. The column-averaged dry air mole fractions of HCHO (XHCHO) reached a maximum monthly mean value of 1.10.27 ppbv in July and a minimum monthly mean value of 0.40.11 ppbv in January. The XHCHO time series from 2015 to 2019 over Hefei showed a positive change rate of 2.380.71% per year. The photochemical HCHO is the dominant source of atmospheric HCHO over Hefei for most of the year (68.1 %). In the studied years, the HCHO photolysis was an important source of OH radicals over Hefei during all sunlight hours of both summer and winter days. The oxidations of both methane (CH4) and nonmethane VOCs (NMVOCs) dominate the HCHO production over Hefei and constitute the main driver of its summertime enhancements. The NMVOCrelated HCHO summertime enhancements were dominated by the emissions within eastern China. The observed increasing change rate of HCHO from 2015 to 2019 over Hefei was attributed to the increase in photochemical HCHO resulting from increasing change rates of both CH4 and NMVOC oxidations, which overwhelmed the decrease in emitted HCHO. This study provides a valuable evaluation of recent VOC emissions and regional photochemical capacity in China. In addition, understanding the sources of HCHO is a necessary step for tackling air pollution in eastern China and mitigating the emissions of pollutants. . © 2021 EDP Sciences. All rights reserved. |
语种 | 英语 |
scopus关键词 | atmospheric pollution; carbon monoxide; EOS; formaldehyde; FTIR spectroscopy; mapping method; methane; ozone; photochemistry; volatile organic compound; China |
来源期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/246939 |
作者单位 | Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, 230026, China; Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China; Institute of Environmental Physics, University of Bremen, P.O. Box 330440, Bremen, 28334, Germany; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Key Laboratory of Precision Scientific Instrumentation, Anhui Higher Education In... |
推荐引用方式 GB/T 7714 | Sun Y.,Yin H.,Liu C.,et al. Mapping the drivers of formaldehyde (HCHO) variability from 2015 to 2019 over eastern China: Insights from Fourier transform infrared observation and GEOS-Chem model simulation[J],2021,21(8). |
APA | Sun Y..,Yin H..,Liu C..,Zhang L..,Cheng Y..,...&Liu J..(2021).Mapping the drivers of formaldehyde (HCHO) variability from 2015 to 2019 over eastern China: Insights from Fourier transform infrared observation and GEOS-Chem model simulation.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(8). |
MLA | Sun Y.,et al."Mapping the drivers of formaldehyde (HCHO) variability from 2015 to 2019 over eastern China: Insights from Fourier transform infrared observation and GEOS-Chem model simulation".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.8(2021). |
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