Optical-microphysical and physical-chemical characteristics of Siberian biomass burning: small-scale fires in an aerosol chamber
O.B. Popovicheva1, V.S. Kozlov2, R.F. Rakhimov2, V.P. Shmargunov2, E.D. Kireeva1, N.M. Persiantseva1, M.A. Timofeev1, G. Engling3, K. Elephteriadis4, L. Diapouli4, M.V. Panchenko2, R. Zimmermann5,6,7, J. SchnelleKreis6,7
1Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 1, Leninskie gory, GSP-1, Moscow 119415, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
3National Tsing Hua University, Hsinchu, Taiwan
4Institute of Nuclear and Radiological Science & Technology, 15341 Ag. Paraskevi, Attiki, Greece
5Joint Mass Spectrometry Center, 85764 Neuherberg, Ingolstaedter Landstr. 1, Germany
6Institute of Chemistry University of Rostock, Dr.-Lorenz-Weg 1, 18059 Rostock, Germany
7Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health, Germany
Keywords: тление, открытое горение, смешанное горение, сибирские биомассы, Большая аэрозольная камера, дымы, характеристики дымовых частиц, smoldering, open burning, mixing burning, Siberian biomasses, Large Aerosol Chamber, smokes, smoke particle’s characteristics
Abstract
Impact of combustion phases of typical Siberian biomass on optical, microphysical, and physical-chemical properties of smoke aerosols were investigated in small-scale fires at the Large Aerosol Chamber (LAC). The comprehensive analysis has revealed the influence of combustion temperature on formation and time evolution of pine and debris emission characteristics. Size distributions and complex refractive indices in the ranges of ultrafine, fine, and coarse particles were determined from polar spectronephelometer measurements of the angular aerosol scattering. In smoldering phases, smoke is found to be weakly absorbing while mixed fires also emit strongly absorbing soot particles produced in open flaming phases. Characteristics of aerosol microstructure such as morphology and composition were analyzed. Group Soot and Organics were identified as micromarkers of Siberian biomass burning in open flaming and smoldering phases, respectively. Carbon fraction (organic and elemental carbon), chemical compounds, and water-soluble ionic fraction exhibit the strong dependence on the combustion phase. Anhydrosugar (levoglucosan) was determined in smoldering fires as the stable molecular marker of Siberian pine burning. A number of chemical compounds were found to act as specific markers of soft wood. At smoke aging in a chamber the condensation of organic and inorganic species leads to transformation of the aerosol surface chemistry and formation of the particle group rich by potassium. Thus, the complexicity and changeability of chemical composition and microstructure of atmospheric aerosol pollution during Siberian wildfires were realized.
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