Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 715, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.136258
Keywords
MAX-DOAS; Formaldehyde; Glyoxal; Volatile organic compounds (VOCs); Biomass burning
Categories
Funding
- National Key Research and Development Program of China [2017YFC0210002, 2018YFC0213104, 2016YFC0203302]
- Anhui Science and Technology Department Major Project [18030801111]
- National Natural Science Foundation of China [41722501, 91544212, 51778596, 41575021, 41977184]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23020301]
- National Key Project for Causes and Control of Heavy Air Pollution [DQGG0102, DQGG0205]
- National High-Resolution Earth Observation Project of China [05-Y20A16-9001-15/17-2]
- Natural Science Foundation of Guangzhou Province [2016A030310115]
Ask authors/readers for more resources
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 PM2.5, whose contribution averaged about 70.15% +/- 9.5% of PM10. The ratio of PM2.5/PM10 decreased when PM2.5 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 (NO2), 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 RGF will increase when biomass burnings were dominated. Using NO2 as a tracer of anthropogenic emissions, we found the R-GF values gradually decrease with the increase of NO2 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. (C) 2020 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available