KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Has files: NoSubject: search.filters.subject.Biomass burning

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Source apportionment of PM2.5 in Thailand’s deep south by principal component analysis and impact of transboundary haze
    (2023-08-01)
    Chaisongkaew, Phatsarakorn
    ;
    Dejchanchaiwong, Racha
    ;
    Inerb, Muanfun
    ;
    Mahasakpan, Napawan
    ;
    Nim, Nobchonnee
    Atmospheric particulate matter smaller than 2.5 micron (PM<inf>2.5</inf>) was evaluated at four sites in the lower southern part of Thailand during 2019–2020 to understand the impact of PM<inf>2.5</inf> transport from peatland fires in Indonesia on air quality during the southwest monsoon season. Mass concentration and chemical bound-PM, including carbon composition, e.g., organic carbon (OC) and elemental carbon (EC), polycyclic aromatic hydrocarbons (PAHs), and inorganic elements, were analyzed. The PM<inf>2.5</inf> emission sources were identified by principal components analysis (PCA). The average mass concentrations of PM<inf>2.5</inf> in the normal period, which represents clean background air, from four sites was 3.5–5.1 µg/m<sup>3</sup>, whereas during the haze period, it rose to 5.4–13.5 µg/m<sup>3</sup>. During the haze period, both OC and EC were 3.5 times as high as in the normal period. The average total PAHs and BaP-TEQ of PM<inf>2.5</inf> during the haze period were ~ 1.3–1.7 and ~ 1.2–1.9 times higher than those in the normal period. The K concentrations significantly increased during haze periods. SO<inf>4</inf><sup>2−</sup> dominated throughout the year. The effects of external sources, especially the transboundary haze from peatland fires, were significantly enhanced, because the background air in the study locations was generally clean. PCA indicated that vehicle emission, local biomass burning, and secondary particles played a key role during normal period, whereas open biomass burning dominated during the haze phenomena. This was consistent with the OC/EC and PAH diagnostic ratios. Backward trajectories confirmed that the sources of PM during the haze period were predominantly peatland fires in Sumatra, Indonesia, due to southwest wind.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Simulating the transport and chemical evolution of biomass burning pollutants originating from Southeast Asia during 7-SEAS/2010 Dongsha experiment
    (2015-07-01)
    Chuang, Ming Tung
    ;
    Fu, Joshua S.
    ;
    Lin, Neng Huei
    ;
    Lee, Chung Te
    ;
    Gao, Yang
    This study aimed to simulate the transport of biomass burning (BB) aerosol originating from Southeast Asia (SEA) during the Dongsha Experiment conducted from March 2010 to April 2010. Transport pathways were reanalyzed and steering flow in the mid-latitude areas and anticyclones in low-latitude areas were found to control the transport of BB plume after it was injected to a high atmosphere. For the 12 simulated and observed events at Mt. Lulin (2862m MSL; 23°28'07″ N, 120°52'25″ E), the 72h backward trajectories were all tracked back to southern China and northern Indochina, which were the locations of the largest BB fire activities in SEA. Chemical evolutions of BB pollutants along the moving trajectories showed that organic matter was always the dominant component in PM<inf>2.5</inf>, consistent with the observations at both near-source regions and Mt. Lulin. For nitrogen species, nearly all NO<inf>x</inf> molecules oxidized into HNO<inf>3</inf>, NO<inf>3</inf><sup>-</sup>, PAN, and PANX in fires or near fires. The synchronic consumption of NO<inf>x</inf>, SO<inf>2</inf>, and NH<inf>3</inf> explained the production of the major components of inorganic salts. In the moving BB plume, sulfate concentration increased with decreased nitrate concentration. Ratios of ammonium to PM<inf>2.5</inf> and elemental carbon to PM<inf>2.5</inf> remained nearly constant because additional sources were lacking.