Measured and modeled humidification factors of fresh smoke particles from biomass burning: role of inorganic constituents

Hand, Jenny L.; Day, Derek E.; McMeeking, G. R.; Levin, Ezra J. T.; Carrico, Christian M.; Kreidenweis, Sonia M.; Malm, William C.; Laskin, Alexander; Desyaterik, Yury

doi:10.5194/acp-10-6179-2010

Cited by 37 publications

(37 citation statements)

References 65 publications

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“…It is noteworthy that more hydrophobic emissions were observed from debris compared to pine fires, probably due to production of less oxidized chemical compounds during combustion. In the small-scale study by Hand et al (2010) the scanning electron microscopy analysis revealed weak and non-hygroscopic particles, quantified by humidification factors, which were dominated by soot and organic constituents. These observations are qualitatively well in accordance with our observations of HPO and HPI particles in the C and C-O fractions.…”

Section: Fresh Smokementioning

confidence: 99%

“…In BB small-scale studies of Hand et al (2010), smoke aerosols were reported to be internally mixed and composed of inorganic salt species (KCl, K 2 SO 4 , KNO 3 , (NH 4 ) 2 SO 4 , NH 4 Cl), carbon (OC and EC), and soil (Al 2 O 3 and CaO). Therefore, the averaged characteristics of smoke hydration properties were obtained such as nonhygroscopic for ponderosa pine or more hygroscopic for sage/rabbit brush burning.…”

Section: Categorization With Respect To Hygroscopicitymentioning

confidence: 99%

“…In BB small-scale studies of Hand et al (2010) hygroscopic particles contained soot chains either internally or externally mixed with inorganic potassium salts. The most hygroscopic smoke particles had the highest inorganic salt to carbon ratios.…”

Section: Aged Smokementioning

confidence: 99%

“…Therefore, the averaged characteristics of smoke hydration properties were obtained such as nonhygroscopic for ponderosa pine or more hygroscopic for sage/rabbit brush burning. The smoke hygroscopic growth was simulated by assuming only inorganic constituents being hygroscopic, when in fact SEM images suggested heterogeneous particles that may be internally or externally mixed (Hand et al, 2010).…”

Section: Categorization With Respect To Hygroscopicitymentioning

confidence: 99%

“…This approach allows to reduce uncertainties in wildfire studies, resulting from a mixture of fuels, impact of soil, wind, and unpredictable combustion phase. Hand et al (2010) demonstrated a significant range in the hygroscopic properties of freshly-produced smoke from flaming and smoldering occurring simultaneously. They assumed that only inorganic salts take up water and organic particles are completely non-hygroscopic during growth of smoke particles in humid environments.…”

Section: Introductionmentioning

confidence: 99%

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Small-Scale Study of Siberian Biomass Burning: II. Smoke Hygroscopicity

Popovicheva

Persiantseva

Тимофеев

et al. 2016

Aerosol Air Qual. Res.

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A lack of understanding about the impact of Siberian wildfire emissions on the environment necessitates the characterization of biomass burning aerosol hygroscopicity. Flaming fires of typical Siberian biomass (pine and debris) were simulated during small-scale combustion experiments in a Large Aerosol Chamber (LAC). Analyses of individual particles with respect to morphology and elemental composition allows the separation of freshly-produced smoke into five fractions with the elemental carbon, chain soot agglomerates, irregular internally mixed soot, and distinct irregular minerals of fly ash containing S, Ca, Al, and Si. Aging in a dark chamber leads to an appearance of the fraction with inorganic inclusions such as KCl and CaCl 2 . Categorization of fresh-emitted and aged particles on hydrophobic, hydrophilic, and hygroscopic ones is performed. The criteria for categorization are extended from fossil fuel hightemperature combustion, based on a concept of water uptake by soot particles and utilization of a number of reference soots with known oxygen content and mixtures with sulfates and other inorganic salts. We show how the hydration properties of emitted smoke particles and inorganic inclusions can increase the initial level of smoke hygroscopicity.

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Section: Fresh Smokementioning

confidence: 99%

Section: Categorization With Respect To Hygroscopicitymentioning

confidence: 99%

Section: Aged Smokementioning

confidence: 99%

Section: Categorization With Respect To Hygroscopicitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Small-Scale Study of Siberian Biomass Burning: II. Smoke Hygroscopicity

Popovicheva

Persiantseva

Тимофеев

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

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Optical, physical, and chemical properties of springtime aerosol over Barrow Alaska in 2008

et al. 2014

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Airborne observations from four flights during the 2008 Indirect and Semi-Direct Aerosol Campaign (ISDAC) are used to examine some cloud-free optical, physical, and chemical properties of aerosol particles in the springtime Arctic troposphere. The number concentrations of particles larger than 0.12 μm (N a>120 ), important for light extinction and cloud droplet formation, ranged from 15 to 2260 cm −3 , with the higher N a>120 cases dominated by measurements from two flights of long-range transported biomass burning (BB) aerosols. The two other flights examined here document a relatively clean aerosol and an Arctic Haze aerosol impacted by larger particles largely composed of dust. For observations from the cleaner case and the BB cases, the particle light scattering coefficients at low relative humidity (RH<20%) increased nonlinearly with increasing N a>120 , driven mostly by an increase in mean sizes of particles with increasing N a>120 (BB cases). For those three cases, particle light absorption coefficients also increased nonlinearly with increasing N a>120 and linearly with increasing submicron particle volume concentration. In addition to black carbon, brown carbon was estimated to have increased light absorption coefficients by 27% (450 nm wavelength) and 14% (550 nm) in the BB cases. For the case with strong dust influence, the absorption relative to submicron particle volume was small compared with the other cases. There was a slight gradient of Passive Cavity Aerosol Spectrometer Probe (PCASP) mean volume diameter (MVD) towards smaller sizes with increasing height, which suggests more scavenging of the more elevated particles, consistent with a typically longer lifetime of particles higher in the atmosphere. However, in approximately 10% of the cases, the MVD increased (>0.4 μm) with increasing altitude, suggesting transport of larger fine particle mass (possibly coarse particle mass) at high levels over the Arctic. This may be because of transport of larger particles at higher elevations and relatively slow deposition to the surface.

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