Emission characteristics of size distribution, chemical composition and light absorption of particles from field-scale crop residue burning in Northeast China

被引:31
|
作者
Wang, Qinglu [1 ,7 ]
Wang, Lili [1 ,7 ]
Li, Xingru [3 ]
Xin, Jinyuan [1 ,7 ]
Liu, Zirui [1 ]
Sun, Yang [1 ,7 ]
Liu, Jingda [8 ]
Zhang, Yanjun [10 ]
Du, Wei [10 ]
Jin, Xin [1 ,7 ]
Zhang, Tianran [9 ]
Liu, Shuiqiao [3 ]
Liu, Quan [5 ]
Chen, Jie [6 ]
Cheng, Miaomiao [4 ]
Wang, Yuesi [1 ,2 ,7 ]
机构
[1] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361021, Peoples R China
[3] Capital Normal Univ, Beijing 100037, Peoples R China
[4] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
[5] Beijing Meteorol Bur, Beijing Weather Modificat Off, Beijing 100089, Peoples R China
[6] China Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing 100049, Peoples R China
[7] Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
[8] Nanjing Univ Informat Sci & Technol, Coll Atmospher Phys, Nanjing 210044, Peoples R China
[9] Kings Coll London, Dept Geog, Earth & Environm Dynam Res Grp, London WC2R 2LS, England
[10] Univ Helsinki, Fac Sci, Inst Atmospher & Earth Syst Res Phys, FIN-00014 Helsinki, Finland
基金
中国国家自然科学基金;
关键词
Crop residue burning; Particle number concentration; Chemical components; Brown carbon; Light absorption; Northeast China; DUST PM2.5 SAMPLES; BROWN CARBON; BLACK CARBON; SOURCE PROFILES; OPTICAL-PROPERTIES; ORGANIC-CARBON; AEROSOL EMISSIONS; HARVEST SEASON; WHEAT-STRAW; BIOMASS;
D O I
10.1016/j.scitotenv.2019.136304
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Crop residue burning in China increased significantly in the last decade, especially it took up a majority in Northeast China, which plays an important role of severe haze pollution. Hence, two main types of crop residues (corn and rice straw) were chosen to characterize the particle number concentration, chemical components of fine particulate matter and optical properties of carbonaceous aerosols by a suite of fast-response online portable instruments, together with offline sampling and analysis, during the field-based combustion experiments in Northeast China. For the range of 250 and 2500 nm, more particles were emitted from rice straw burning than those from corn straw burning, and the time-averaged number concentration of particles during the flaming process was approximately 2 times higher than that during the smoldering process for these two straws. Organic carbon (OC), elemental carbon (EC) and water-soluble ions were the most abundant components and accounted for 42.5 +/- 7.5%, 7.7 +/- 1.7% and 18.0 +/- 3.4% of the PM2.5, respectively. Furthermore, rice straw burning emitted higher OC and lower Cl- and K+ than those from corn straw burning. The average absorption Angstrom exponent (AAE) of carbonaceous aerosols was 2.1 +/- 0.3, while the AAE of brown carbon (BrC) was 4.7 +/- 0.4 during the whole burning process. On average, BrC contributed to 63% and 20% of the total light absorption at 375 nm and 625 nm, respectively. Parameterization of BrC absorption revealed that the fraction of absorption from BrC has a reasonably good correlation with EC/OC (-0.84) and ME (0.94) at 375 nm. Generally, combustion conditions can affect the optical properties of carbonaceous aerosols, and a negative correlation ( -0.77) was observed between the AAE and modified combustion efficiency; in addition, the percentage of absorption due to BrC were lower at the flaming phase. (C) 2018 Elsevier B.V. All rights reserved.
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页数:13
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