Mixing state of biomass burning particles by single particle aerosol mass spectrometer in the urban area of PRD, China

被引:166
作者
Bi, Xinhui [1 ]
Zhang, Guohua [1 ,2 ]
Li, Lei [3 ]
Wang, Xinming [1 ]
Li, Mei [3 ]
Sheng, Guoying [1 ]
Fu, Jiamo [1 ,3 ]
Zhou, Zhen [3 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Utilizat & Protect Environ, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
[3] Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China
关键词
Biomass burning; Mixing state; Single particle; Nitrate; Sulfate; SPAMS; ATOFMS; Aerosol; PRD; PEARL RIVER-DELTA; CLOUD CONDENSATION NUCLEI; CHEMICAL-COMPOSITION; REAL-TIME; OPTICAL-PROPERTIES; SIZE DISTRIBUTIONS; PARTICULATE MATTER; AIRBORNE PARTICLES; ORGANIC-COMPOUNDS; BLACK CARBON;
D O I
10.1016/j.atmosenv.2011.03.034
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Single particle aerosol mass spectrometer (SPAMS) was used to characterize the single particle size and chemical composition of submicron aerosols in the urban area of the Pearl River Delta region, China, for the period April 30 through May 22, 2010. A total of 696,465 particles were sized and chemically analyzed with both positive and negative ion spectra, in which 141,338 biomass burning particles were identified representing a significant source of submicron particles similar to 20.3% by number. The results have revealed that biomass burning particles have experienced extensive atmospheric processing, finding that as much as 90.5% of the particles have internally mixed with secondary inorganic species. Biomass burning particles were clustered into six distinct particle groups, comprising of K-Ca-rich, K-Na-rich, K-organic carbon (K-OC), K-elemental carbon (K-EC), K-the mixture of OC and EC (K-OCEC) and K-Secondary. K-OC was the largest contributor with a fraction of 22.9%, followed by K-Secondary type (21.4%) and K-OCEC (19.0%). K-Na-rich type was observed in 11.9% of the particles and 90% internally mixed with EC. The fraction of nitrate in biomass burning particles was 10% higher than in the non-biomass burning particles. The sodium and potassium in biomass burning particles could exhibit high affinity for nitrate gases during neutralization reactions, facilitating the particulate nitrate formation. Meanwhile, the particulate sulfate in particles in the droplet-mode size was also enhanced. The results added appreciably to the knowledge of aerosol characteristics in the PRD region atmosphere and could be applied to the climate models. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3447 / 3453
页数:7
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