Characterization of submicron aerosols in the urban outflow of the central Pearl River Delta region of China

doi:10.1007/s11783-012-0441-8

Front Envir Sci Eng

2012, Vol. 6

Issue (5) : 725-733 https://doi.org/10.1007/s11783-012-0441-8

RESEARCH ARTICLE

Characterization of submicron aerosols in the urban outflow of the central Pearl River Delta region of China

Zhaoheng GONG¹, Zijuan LAN¹, Lian XUE², Liwu ZENG¹, Lingyan HE^1,3, Xiaofeng HUANG¹(

)

1. Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; 2. Qingdao Environmental Monitoring Center, Qingdao 266003, China; 3. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Sciences and Engineering, Nanjing University of Information Sciences and Engineering, Nanjing 210044, China

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Abstract

Submicron aerosol particles (with aerodynamic diameters less than 1 μm, PM₁) were sampled and measured in Heshan, an urban outflow site of Guangzhou megacity in Pearl River Delta in South China, using an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) in November 2010 during 2010 Guangzhou Asian Games. The mean PM₁ mass concentration measured was 47.9±17.0 μg·m^-3 during the campaign, with organic aerosol (OA) and sulfate being the two dominant species, accounting for 36.3% and 20.9% of the total mass, respectively, followed by black carbon (17.1%, measured by an aethalometer), nitrate (12.9%), ammonium (9.6%) and chloride (3.1%). The average size distributions of the species (except black carbon) were dominated by an accumulation mode peaking at ~550 nm. Calculations based on high-resolution organic mass spectrum showed that, C, H, O and N on average contributed 58.1%, 7.3%, 30.7%, and 3.9% to the total organic mass, respectively. The average ratio of organic mass over organic carbon mass (OM/OC) was 1.73±0.08. Four components of OA were identified by the Positive Matrix Factorization (PMF) analysis, including a hydrocarbon-like (HOA), a biomass burning (BBOA) and two oxygenated (SV-OOA and LV-OOA) organic aerosol components, which on average accounted for 18.0%, 14.3%, 28.8% and 38.9% of the total organic mass, respectively.

Keywords organic aerosol high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) positive matrix factorization

Corresponding Author(s): HUANG Xiaofeng,Email:huangxf@pku.edu.cn

Issue Date: 01 October 2012

Cite this article:

Zhaoheng GONG,Zijuan LAN,Lian XUE, et al. Characterization of submicron aerosols in the urban outflow of the central Pearl River Delta region of China[J]. Front Envir Sci Eng, 2012, 6(5): 725-733.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0441-8
https://academic.hep.com.cn/fese/EN/Y2012/V6/I5/725

Fig.1 Time series of mass concentrations of NR-PM major components (a), and atom ratio of O/C and OM/OC (b); percentages of major components (c); average size distribution of major components (d)

Fig.2 Diurnal trends of the mass concentrations of major PM components (a-f) and atom ratio of O/C (b)

Fig.3 The mass spectra profiles of the four organic components identified by PMF

Fig.4 The time series of the four (a-d) organic components identified by PMF, and other relevant species; (e) the average OA composition; and (f) the diurnal variations of the OA components

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