Emissions from the Open Laboratory Combustion of Cheatgrass (Bromus Tectorum)

Rennie, Megan; Samburova, Vera; Sengupta, Deep; Bhattarai, Chiranjivi; Arnott, W. P.; Khlystov, Andrey; Moosmüller, Hans

doi:10.3390/atmos11040406

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…Above this height, the chamber tapers to an exhaust pipe that contains multiple sampling ports and exhausts chamber air to a roof outlet, with the exhaust flow rate controlled by a fan and a variable opening for the air inlet located at the bottom of the chamber, directly below the burn platform [14]. This facility has been used extensively for the characterization of combustion emissions [7,14,33,51,[54][55][56][57][58] and smoke sensors [59][60][61]. Small amounts (~50 g) of fuel were burned in this chamber under controlled conditions (relative humidity, temperature, fuel moisture content, etc.).…”

Section: Dri Biomass-burning Facilitymentioning

confidence: 99%

Optical Characterization of Fresh and Photochemically Aged Aerosols Emitted from Laboratory Siberian Peat Burning

Iaukea-Lum¹

2022

Atmosphere

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Carbonaceous aerosols emitted from biomass burning influence radiative forcing and climate change. Of particular interest are emissions from high-latitude peat burning because amplified climate change makes the large carbon mass stored in these peatlands more susceptible to wildfires and their emission can affect cryosphere albedo and air quality after undergoing transport. We combusted Siberian peat in a laboratory biomass-burning facility and characterized the optical properties of freshly emitted combustion aerosols and those photochemically aged in an oxidation flow reactor (OFR) with a three-wavelength photoacoustic instrument. Total particle count increased with aging by a factor of 6 to 11 while the total particle volume either changed little (<8%) for 19 and 44 days of equivalent aging and increased by 88% for 61 days of equivalent aging. The aerosol single-scattering albedo (SSA) of both fresh and aged aerosol increased with the increasing wavelength. The largest changes in SSA due to OFR aging were observed at the shortest of the three wavelengths (i.e., at 405 nm) where SSA increased by less than ~2.4% for 19 and 44 days of aging. These changes were due to a decrease in the absorption coefficients by ~45%, with the effect on SSA somewhat reduced by a concurrent decrease in the scattering coefficients by 20 to 25%. For 61 days of aging, we observed very little change in SSA, namely an increase of 0.31% that was caused a ~56% increase in the absorption coefficients that was more than balanced by a somewhat larger (~71%) increase in the scattering coefficients. These large increases in the absorption and scattering coefficients for aging at 7 V are at least qualitatively consistent with the large increase in the particle volume (~88%). Overall, aging shifted the absorption toward longer wavelengths and decreased the absorption Ångström exponents, which ranged from ~5 to 9. Complex refractive index retrieval yielded real and imaginary parts that increased and decreased, respectively, with the increasing wavelength. The 405 nm real parts first increased and then decreased and imaginary parts decreased during aging, with little change at other wavelengths.

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Section: Dri Biomass-burning Facilitymentioning

confidence: 99%

Optical Characterization of Fresh and Photochemically Aged Aerosols Emitted from Laboratory Siberian Peat Burning

Iaukea-Lum¹

2022

Atmosphere

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“…It is well known that wildfires affect flora and fauna [1][2][3][4][5], burn various fuels [6], and emit large quantities of gases (e.g., CO 2 and CO) and particles (e.g., black [7], brown [8,9], and organic carbon [10][11][12]) that are further modified during atmospheric transport [13][14][15][16]. Wildfires greatly affect air quality [17][18][19], human health [18,20,21], cloud formation and properties [22,23], and atmospheric light absorption and radiative forcing in the atmosphere [24][25][26] and after deposition onto snow [27,28].…”

Section: Introductionmentioning

confidence: 99%

Modification of Soil Hydroscopic and Chemical Properties Caused by Four Recent California, USA Megafires

Samburova,

Schneider,

Rüger

et al. 2023

Fire

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While it is well known that wildfires can greatly contribute to soil water repellency by changing soil chemical composition, the mechanisms of these changes are still poorly understood. In the past decade, the number, size, and intensity of wildfires have greatly increased in the western USA. Recent megafires in California (i.e., the Dixie, Beckwourth Complex, Caldor, and Mosquito fires) provided us with an opportunity to characterize pre- and post-fire soils and to study the effects of fires on soil water repellency, soil organic constituents, and connections between the two. Water drop penetration time (WDPT) tests performed in the field showed a significant increase (from <1 s up to >600 s) in WDPT from pre- to post-fire soils. This increase in soil water repellency after fires was confirmed by increases in apparent contact angle (ACA) between 1.1 and 9 times from unburned to burned soils. The chemical characterization of burned soils with high resolution mass spectrometry showed the increased abundance of hydrophobic organics (e.g., PAH-like compounds and organic molecules with a low number of oxygen atoms) as well as the correlation of the average H/C ratio and aromaticity index (AI) with ACA. Most likely, these compounds contribute to post-fire soil water repellency that triggers hydrological effects such as landslides, flooding, and debris flows.

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Emission factors and chemical characterization of particulate emissions from garden green waste burning

Noblet

Besombes

Lemire

et al. 2021

Science of The Total Environment

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Emissions from the Open Laboratory Combustion of Cheatgrass (Bromus Tectorum)

Cited by 4 publications

References 56 publications

Optical Characterization of Fresh and Photochemically Aged Aerosols Emitted from Laboratory Siberian Peat Burning

Optical Characterization of Fresh and Photochemically Aged Aerosols Emitted from Laboratory Siberian Peat Burning

Modification of Soil Hydroscopic and Chemical Properties Caused by Four Recent California, USA Megafires

Emission factors and chemical characterization of particulate emissions from garden green waste burning

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