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Sci Total Environ

Title:		"Identifying the wintertime sources of volatile organic compounds (VOCs) from MAX-DOAS measured formaldehyde and glyoxal in Chongqing, southwest China"
Author(s):		Xing C; Liu C; Hu Q; Fu Q; Lin H; Wang S; Su W; Wang W; Javed Z; Liu J;
Address:		"Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230026, China; Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei 230026, China. Electronic address: chliu81@ustc.edu.cn. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. Shanghai Environmental Monitoring Center, Shanghai 200235, China. School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, 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"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20191227
Issue:
Page Number:		136258 -
DOI:		10.1016/j.scitotenv.2019.136258
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations were performed from 27 December 2018 to 16 January 2019 in Changshou, one of subdistricts of Chongqing, China. Primary atmospheric pollutant in Changshou during wintertime was PM(2.5), whose contribution averaged about 70.15% +/- 9.5% of PM(10). The ratio of PM(2.5)/PM(10) decreased when PM(2.5) pollution became worse, and it should attribute to biomass burning and the contribution of hygroscopic growth and enhanced heterogeneous chemistry under high relative humidity condition. Moreover, nitrogen dioxide (NO(2)), formaldehyde (HCHO) and glyoxal (CHOCHO) vertical profiles during the campaign period were retrieved separately. TROPOMI HCHO vertical column densities (VCDs) and MAX-DOAS HCHO VCDs were correlated well (R = 0.93). In order to identify the sources of volatile organic compound (VOC) in Changshou, the ratio of CHOCHO to HCHO (R(GF)) in five different layers were estimated. The estimated daily averaged R(GF) were 0.0205 +/- 0.0077, 0.0727 +/- 0.0286, 0.0864 +/- 0.0296, 0.0770 +/- 0.0275 and 0.0746 +/- 0.0263 in 0-100 m, 100-200 m, 300-400 m, 500-600 m and 700-800 m layers, respectively. The estimated R(GF) will increase when biomass burnings were dominated. Using NO(2) as a tracer of anthropogenic emissions, we found the R(GF) values gradually decrease with the increase of NO(2) levels. R(GF) values in 0-100 m layer and all the other upper layers are 0.015-0.025 and 0.06-0.14, and that means the dominant sources of VOCs in 0-100 m layer and all the other upper layers are biogenic emission and anthropogenic emission (especially biomass burning), respectively. In addition, we found that R(GF) has site dependence which is in compliance with several previous studies"
Keywords:		Biomass burning Formaldehyde Glyoxal Max-doas Volatile organic compounds (VOCs);
Notes:		"PubMed-not-MEDLINEXing, Chengzhi Liu, Cheng Hu, Qihou Fu, Qingyan Lin, Hua Wang, Shuntian Su, Wenjing Wang, Weiwei Javed, Zeeshan Liu, Jianguo eng Netherlands 2020/02/03 Sci Total Environ. 2020 May 1; 715:136258. doi: 10.1016/j.scitotenv.2019.136258. Epub 2019 Dec 27"