About AAQR

Aims and Scope

Articles online
For contributors
Call for Papers
Guideline for the
Special Issue Proposal
Subscription
Information

Advertising

Contact Us
 
Search for  in   Search  Advanced search  

 

Volume 16, No. 11, November 2016, Pages 2603-2617 PDF(1.15 MB)  
doi: 10.4209/aaqr.2015.07.0465   

Aerosol Chemical Profile of Near-Source Biomass Burning Smoke in Sonla, Vietnam during 7-SEAS Campaigns in 2012 and 2013

Chung-Te Lee1, Shidharth Sankar Ram1, Dac Loc Nguyen1, Charles C.K. Chou2, Shih-Yu Chang3, Neng-Huei Lin4, Shuenn-Chin Chang5,6, Ta-Chih Hsiao1, Guey-Rong Sheu4, Chang-Feng Ou-Yang4, Kai Hsien Chi7, Sheng-Hsiang Wang4, Xue-Chang Wu1

1 Graduate Institute of Environmental Engineering, National Central University, Chung-Li 32001, Taiwan
2 Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
3 Chung Shan Medical University, School of Public Health, Taichung 40201, Taiwan
4 Department of Atmospheric Sciences, National Central University, Chung-Li 32001, Taiwan
5 School of Public Health, National Defense Medical Center, Taipei 11490, Taiwan
6 Environmental Protection Administration, Taipei 10042, Taiwan
7 Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei 11221, Taiwan

 

Highlights
  • Carbonaceous contents dominate biomass burning PM2.5.
  • OC3 and EC1-OP are the most abundant OC and EC fractions, respectively.
  • Trajectory paths influence aerosol profile of near-source biomass burning.
  • SO42– and NH4+ are enhanced by trajectory paths with anthropogenic origin.
  • K+, OC3, EC1-OP, and levoglucosan are tracers of biomass burning.

Abstract

 

This study aimed to investigate aerosol chemical characteristics and to obtain the chemical profile of near-source biomass burning (BB) aerosols at a site (675 m a.s.l.) in Sonla, Northern Vietnam. Particulate matter (PM) with an aerodynamic diameter less than or equal to 2.5 µm (PM2.5) was collected over a 24 h sampling period as part of the Seven South East Asian Studies (7-SEAS) campaign. The studies were conducted when BB was highly active — that is, in the spring of 2012 and 2013. The collected particles were analyzed for carbonaceous fractions and water-soluble components, in addition to the mass concentration. Data obtained were further analyzed to determine the stable species profile by classifying the 5-day air-mass backward trajectories. The average PM2.5 mass concentrations were 51 ± 19 µg m–3 and 57 ± 27 µg m–3 in 2012 and 2013, respectively. Carbonaceous contents dominated BB aerosol, with 59% ± 9% and 58% ± 9% in organic carbon (OC) and 9% ± 3% and 10% ± 3% in elemental carbon (EC) of PM2.5 in 2012 and 2013, respectively. Of the 8 carbonaceous fractions analyzed thermo-optically for PM2.5, OC3 (evolution temperature at 280°C–480°C) was most abundant in OC fractions, and EC1-OP (elemental carbon evolved at 580°C minus the pyrolized OC fractions) was predominant in EC fractions in most occasions. Among the measured water-soluble inorganic ions, NH4+ and SO42– widely varied, indicating the influence of different trajectory origins. This finding was confirmed by trajectory classification of aerosol data. The trajectories were also distinguished with respect to char-EC to soot-EC ratio, and water-soluble OC. These characteristics were highest in the trajectory from the BB source area.

 

 

Keywords: Biomass burning; Near-source aerosol chemical profile; Carbonaceous contents; Water-soluble inorganic ions; Water-soluble organic carbon.

 

 

Copyright © 2009-2014 AAQR All right reserved.