Small-Scale Study of Siberian Biomass Burning: I. Smoke Microstructure

Popovicheva, Olga; Kozlov, V. S.; Engling, Guenter; Diapouli, Evangelia; Persiantseva, N. M.; Тимофеев, М. А.; Fan, Ting-Sin; Saraga, Dikaia; Eleftheriadis, Konstantinos

doi:10.4209/aaqr.2014.09.0206

Cited by 41 publications

(49 citation statements)

References 51 publications

(79 reference statements)

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“…Several extensive studies have been conducted to characterize BB aerosols world-wide (e.g., Popovicheva et al, 2015;Lee et al, 2016 and references therein), including studies over the Indochina region: Myanmar, Thailand, Laos, Cambodia, and Vietnam (e.g., Lee et al, 2011;Chuang et al, 2013;Lee et al, 2016). Chuang et al (2013) characterized the aerosol chemical properties from near-source BB in northern Indochina during the Seven South East Asian Studies (7-SEAS)/Dongsha Experiment, and reported a significant contribution by the smoldering state of softwood burning.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Biomass Burning Chemical Components over Northern Southeast Asia during 7-SEAS/BASELInE 2014 Campaign

Khamkaew

Chantara

Janta

et al. 2016

Aerosol Air Qual. Res.

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This study investigates the chemical components of biomass burning (BB) aerosols obtained from Doi Ang Khang (DAK; near BB source) and Chiang Mai University (CMU; an urban location) over northern Southeast Asia in dry season (March to mid-April) 2014. PM 2.5 (particulate matter with an aerodynamic diameter less than or equal to 2.5 µm) samples were collected over a 24-h sampling period as a part of the Seven South East Asian Studies ) and CMU (90.7-93.1 µg m -3 ) were not significantly different (p > 0.05) and well correlated (r = 0.8), and likely originated from similar source origins. The number of fire hotspots was particularly high during 20-21 March (greater than 200) and, consequently, peaks of PM 2.5 were recorded at both sites. The most abundant elements at both sampling sites were K (49-50% of total elements), Al (26-31%), Mg (16%) and Zn (4-7%), whereas SO 4 2-(30-38% of total ions), NO 3 -(13-20%), Na + (16-20%) and NH 4 + (14-15%) were the most abundant ions. Concentrations of levoglucosan and K + (BB tracers) were well correlated (r = 0.5 for CMU and 0.7 for DAK) confirming that the PM 2.5 detected in these areas were mainly influenced by BB activity. Principal component analysis (PCA) revealed that BB, road traffic, agricultural activity and soil re-suspension were plausible sources of PM 2.5 over the study locations. Apart from local sources, the influence of long-range transport was also investigated by way of three-day backward trajectory analysis.

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Section: Introductionmentioning

confidence: 99%

Investigation of Biomass Burning Chemical Components over Northern Southeast Asia during 7-SEAS/BASELInE 2014 Campaign

Khamkaew

Chantara

Janta

et al. 2016

Aerosol Air Qual. Res.

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“…1.4), as was observed in smoke emissions from flaming burns of other biomass species (Popovicheva et al, 2014a). These particles probably contain OC with relative abundances in total carbon as high as 32% and 37% in pine and debris smoke, respectively (Popovicheva et al, 2015b).…”

Section: Fractionation With Respect To Morphology and Compositionmentioning

confidence: 61%

“…Sulfates may be condensed on soot particles forming internally mixed soot and do not change soot morphology, as shown in Popovicheva et al (2015b). They may also form irregular-shaped particles of salts ( Fig.…”

Section: Fractionation With Respect To Morphology and Compositionmentioning

confidence: 99%

“…Individual particle analysis in terms of smoke morphology and elemental composition revealed a strong dependence on combustion temperature, i.e., a dominant abundance of soot agglomerates versus roughly spherical organic particles in the flaming and smoldering phase, respectively (Popovicheva et al, 2015b). Cluster analysis separated pine wood and debris particles from flaming fires into major characteristic groups where Group Soot accounted for around 90% of total particle number.…”

Section: Introductionmentioning

confidence: 99%

“…Experiments are described in detail in part I of the LAC study (Popovicheva et al, 2015b). Briefly, high-temperature combustion was conducted in an oven centered in the LAC at temperatures ~700°C, simulating open fires in the flaming phase.…”

Section: Small-scale Chamber Burnsmentioning

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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Wintertime carbonaceous aerosols over Dhauladhar region of North-Western Himalayas

Kaushal

Kumar

Yadav

et al. 2018

Environ Sci Pollut Res

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Carbonaceous aerosols play an important role in affecting human health, radiative forcing, hydrological cycle, and climate change. As our current understanding about the carbonaceous aerosols, the source(s) and process(es) associated with them in the ecologically sensitive North-Western Himalayas are limited; this systematic study was planned to understand inherent dynamics in the mass concentration and source contribution of carbonaceous aerosols in the Dhauladhar region. During four winter months (January 2015-April 2015), 24-h PM samples were collected every week simultaneously at the rural site of Pohara (32.19° N, 76.20° E; 750 m amsl) and the urban location of Dharamshala (32.20° N, 76.32° E; 1350 m amsl). These samples were analyzed by using thermal/optical carbon analyzer for different carbon forms. Organic carbon (OC) dominated over elemental carbon (EC) and was found to be 59.3 and 64.1% in total carbon (TC) at Pohara and Dharamshala, respectively. The respective mass concentrations of OC and EC were higher at Pohara (6.8 ± 2.3 and 4.8 ± 2.0 μg.m) in comparison to that observed in Dharamshala (5.0 ± 3.1 and 2.5 ± 0.6 μg.m). The OC/EC ratio at Pohara (1.51 ± 0.41) indicates the dominance of fossil fuel combustion (coal and vehicular exhaust), while at Dharamshala, an OC/EC of 2.01 ± 1.07 signified additional contribution from secondary organic carbon (SOC). Diagnostic ratios (OC/EC and char-EC/soot-EC) suggested dominance of emissions from fossil fuel combustion sources over biomass burning sources in the region. Estimated non-sea salt (nss)K/OC and nssK/EC ratios indicated heterogeneity within the biomass burning sources over low and high altitude locations. A strong correlation between nssK and SOC over a high altitude urban location further suggested possible conversion of gaseous precursors to carbonaceous particles during coniferous wood burning.

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Small-Scale Study of Siberian Biomass Burning: I. Smoke Microstructure

Cited by 41 publications

References 51 publications

Investigation of Biomass Burning Chemical Components over Northern Southeast Asia during 7-SEAS/BASELInE 2014 Campaign

Investigation of Biomass Burning Chemical Components over Northern Southeast Asia during 7-SEAS/BASELInE 2014 Campaign

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

Wintertime carbonaceous aerosols over Dhauladhar region of North-Western Himalayas

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