Effects of combustion condition and biomass type on the light absorption of fine organic aerosols from fresh biomass burning emissions over Korea

Park, Seungshik; Yu, Geun-Hye; Bae, Min‐Suk

doi:10.1016/j.envpol.2020.114841

Cited by 22 publications

(20 citation statements)

References 55 publications

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“…In this study, the wavelength-dependent BrC absorption (Abs BrC,λ ) was calculated by subtracting the BC absorption (Abs BC,λ ) from the total aerosol absorption (Abs abs,λ ) [48]. Additionally, the wavelength-dependent BC absorption at wavelengths of <880 nm was estimated by assuming that most of the total aerosol absorption at 880 and 950 nm is associated with BC [48,49]. Figure 3 shows the diurnal cycles of aerosol absorption coefficients at 370 and 880 nm during summer and winter at the CNU site.…”

Section: Highwaymentioning

confidence: 99%

“…Aerosol samples were collected on a pre-baked (500 °C for 24 h) quartz-fiber filter (47 mm, Pall flex Tissue quartz 2500QAT-UP) using a low-volume PM2.5 cyclone inlet sampler (URG-2000-30EH, URG Corporation) operated at 16.7 L/min. A carbon-impregnated diffusion denuder (Sunset Lab, OR) was placed downstream of the cyclone inlet system to minimize positive artifacts by the assuming that most of the total aerosol absorption at 880 and 950 nm is associated with BC [48,49].…”

Section: Highwaymentioning

confidence: 99%

“…Generally, it is known that fresh BC particles from vehicle emissions have aerosol absorption Ångström exponent (AAE) values close to 1.0, whereas light-absorbing organic aerosols (OAs) from fresh BB emissions have AAE values of approximately 2.0 or greater [7,49,70,76,77]. It has also been shown that these values vary with the biomass type and burning temperature [49,77,78]. It is well known that BC absorption exhibits a weak spectral dependence, but BrC shows a strong spectral dependence, with greater absorption in the near UV region [7].…”

Section: Optical Properties Of Brown Light Absorbing Carbon At the Cn...mentioning

confidence: 99%

“…The lower AAE values for BrC during the summer were due to a greater contribution of water-insoluble OAs, probably emitted from vehicles, to total aerosol absorption, rather than from water-soluble OAs. Many previous studies indicated that BB emissions have typical BrC AAE values of 6-8 due to a greater impact of water-soluble OC fractions [49,[68][69][70]77,79]. Generally, previous studies reported that the AAE values of BrC-containing aerosols were lower than those of water-extracted BrC due to the contribution of the water-insoluble OC (WIOC) fraction [52,71,78].…”

Section: Optical Properties Of Brown Light Absorbing Carbon At the Cn...mentioning

confidence: 99%

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Chemical Composition and Light Absorption of PM2.5 Observed at Two Sites near a Busy Road during Summer and Winter

et al. 2020

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To examine the difference in the major chemical composition of fine particulate matter (PM2.5) between two roadway sites, 24 h integrated PM2.5 samples were simultaneously collected both 15 m (Buk-Ku District Office (BKO) site) and 150 m (Chonnam National University campus (CNU) site) away from busy roads during the summer and winter periods; these samples were taken to determine the concentrations of organic and elemental carbon (OC and EC), water-soluble organic carbon (WSOC), and water-soluble inorganic species. In addition, the real-time aerosol light absorption coefficients (Abs) were measured using a dual-spot seven-wavelength aethalometer at the CNU site to evaluate the influence of traffic and biomass burning (BB) emissions on the concentrations of organic aerosol particles. The hourly NO2 concentration was also observed at an air pollution monitoring network that is about 2 km away from the CNU site. During summer, 24 h PM2.5 concentrations (PM2.5 episode) which exceeded the Korean PM2.5 standard (35 μg/m3) were linked to increases in organic matter (OM) and SO42− concentrations that accounted for on average 35–41% and 26–30%, respectively, of the PM2.5 at the two sites. The increased SO42− concentration was most likely attributable to the inflow of long-range transported aerosols, rather than local production, as demonstrated by both the MODIS (Moderate Resolution Imaging Spectroradiometer) images and transport pathways of air masses reaching the sites. On the other hand, the OM, WSOC, and EC concentrations were directly attributable to traffic emissions at the sampling sites, as supported by the tight correlation between the OC and EC. A small difference between the absorption Ångström exponent (AAE) values calculated at wavelengths of 370–950 nm (AAE370–950nm) and 370–520 nm (AAE370–520nm), and the poor correlation of absorption coefficient by brown carbon (BrC) at 370 nm (AbsBrC370nm) with K+ (R2 = 0.00) also suggest a significant contribution of traffic emissions to OM. However, the wintertime PM2.5 episode was strongly related to the enhanced OM and NO3− concentrations, which contributed 26–28% and 22–23% of the PM2.5 concentration, respectively. It is interesting to note that there were two distinct OC/EC ratios in winter: a lower OC/EC (~3.0), which indicates a significant contribution of traffic emissions to the OC and EC, and a higher OC/EC (~6.5), which suggests an additional influence of BB emissions as well as traffic emissions at the sites. Strong correlations between the OC and EC (R2 = 0.72–0.83) and the enhanced AAE370–520nm values compared to the AAE370–950nm support that BB emissions were also an important contributor to the wintertime OM concentrations as well as traffic emissions at the two sites. A good correlation between the gaseous NO2 and NO3− and meteorological conditions (e.g., low wind speed and high relative humidity) suggest that the heterogeneous oxidation of NO2 on moist particles could be an important contributor to wintertime particulate NO3− formation at the sites. The OC concentrations during summer and winter were higher at the BKO site, with a higher traffic flow and a shorter distance from the roadway than at the CNU site. However, there were slight differences in the concentrations of secondary inorganic species (NO3−, SO42−, and NH4+) between the sites during summer and winter.

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Section: Highwaymentioning

confidence: 99%

Section: Highwaymentioning

confidence: 99%

Section: Optical Properties Of Brown Light Absorbing Carbon At the Cn...mentioning

confidence: 99%

Section: Optical Properties Of Brown Light Absorbing Carbon At the Cn...mentioning

confidence: 99%

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Chemical Composition and Light Absorption of PM2.5 Observed at Two Sites near a Busy Road during Summer and Winter

et al. 2020

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“…The traditional Korean home stove is an underfloor heating device. Unfortunately, information on the nature and extent of the burning of crop residues in home stoves on the Korean Peninsula is still limited [15].…”

Section: Introductionmentioning

confidence: 99%

Postharvest Burning of Crop Residues in Home Stoves in a Rural Site of Daejeon, Korea: Its Impact to Atmospheric Carbonaceous Aerosol

Jung

Kang

2021

Atmosphere

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To investigate the impact of burning postharvest crop residues in home stoves, PM2.5 samples (particulate matter with a diameter of <2.5 μm) were collected every 3 h at a rural site in Daejeon, Korea during the postharvest season in 2014. A high concentration of levoglucosan was observed with a peak value of 3.8 µg/m3 during the sampling period. The average mannosan/levoglucosan ratio (0.18) at the rural site during a severe BB episode (levoglucosan > 1 μg/m3) was similar to burnings of pepper stems (0.19) and bean stems (0.18) whereas the average OC/levoglucosan ratio (9.9) was similar to burning of pepper stems (10.0), implying that the severe BB episode was mainly attributed to burning of pepper stems. A very strong correlation was observed between levoglucosan and organic carbon (OC) (R2 = 0.81) during the entire sampling period, suggesting that the emission of organic aerosols at the rural site was strongly associated with the burning of crop residues in home stoves. The average mannosan/levoglucosan ratio (0.17 ± 0.06) in the rural area was similar to that in a nearby urban area in Daejeon (0.16 ± 0.04). It was concluded that crop residue burning in a home stove for space heating is one of the important sources of carbonaceous aerosols not only in a rural area but also in the urban area of Daejeon, Korea during the postharvest season.

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Fresh organic and soot particles from crop straw burning: Morphology, composition and size distribution

Li,

Shao,

Wang

et al. 2023

Geological Journal

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Particulate matter from biomass burning is considered to be one of the major sources of air pollution in China. To examine the characteristics of the particles emitted from the burning of crop straw, an open burning experiment is designed. Individual particles are collected in the flaming and smouldering stages, and analysed by individual particle analyses represented by high‐resolution transmission electron microscopy equipped with the energy‐dispersive X‐ray spectrometer. Five types of particles are identified, namely, pure organic particle, organic particle‐K (OP‐K), tar ball, K‐rich and soot particles. Of these, the OP‐K particles have the highest relative number percentage in all analysed particles in both the flaming and smouldering stages. Interestingly, the microscopic morphology of organic particles is completely different in the flaming and smouldering stages, being near‐spherical in the flaming stage and gel‐like in the smouldering stage. According to the elemental compositions, most of OP‐K particles contained potassium compounds in the form of KCl and K2SO4. High combustion efficiency and temperature promote the formation of crystal structure, resulting in the onion‐like microstructure of soot particles. Apparently, the soot microstructure is a fingerprint feature that helps identify combustion sources. In addition, the particles emitted in the flaming stage are smaller than those in the smouldering stage, implying that high temperature combustion tends to be associated with high combustion efficiency. The relationship between burning temperatures and particle sizes can help to understand the emission of particles from crop straw burning and find new ways to solve the problems caused by straw burning. The results of this study can provide more detailed ‘fingerprint’ characteristics of the particulate matter emitted from biomass‐burning sources, and an understanding of their potential impact on the atmospheric environment.

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Effects of combustion condition and biomass type on the light absorption of fine organic aerosols from fresh biomass burning emissions over Korea

Cited by 22 publications

References 55 publications

Chemical Composition and Light Absorption of PM2.5 Observed at Two Sites near a Busy Road during Summer and Winter

Chemical Composition and Light Absorption of PM2.5 Observed at Two Sites near a Busy Road during Summer and Winter

Postharvest Burning of Crop Residues in Home Stoves in a Rural Site of Daejeon, Korea: Its Impact to Atmospheric Carbonaceous Aerosol

Fresh organic and soot particles from crop straw burning: Morphology, composition and size distribution

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