Optical-Microphysical and Physical-Chemical Characteristics of Siberian Biomass Burning: Experiments in Aerosol Chamberстатья
Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 марта 2017 г.
Аннотация:A series of experiments, aimed at studying the effect of combustion regimes of typical Siberian biomasseson the optical, microphysical, and physical-chemical properties of smoke aerosols, was performed inthe Large Aerosol Chamber (LAC)of Institute of Atmospheric Optics, Siberian Branch of Russian Academy ofSciences. A comprehensive data analysis showed that temperature regime of Siberian pine and coniferous tree
debris burning has a key effect on the formation and time dynamics of all smoke characteristics. Thepolarization spectronephelometer measurements of light scattering are used to determine the size distributions
and absorption indices of ultrafine, fine, and coarse particles.Particles in smoldering-phase are weakly absorbing, but mixed phase contains a
strongly absorbing fine component produced in open flame. We studied microstructure
characteristics of aerosols by analysis of morphology and elemental composition. Groups of
soot and organic particles were determined as micromarkers of emissions in open flaming and smolderingphase, respectively. The organic and elemental carbon contents, origin and concentration of chemical compoundsin the water-soluble ion fraction exhibit a strong dependence on the combustion phase. Sugar anhydride
(levoglucosan) was determined in smoldering phase as a stable molecular marker of Siberian pineburning. A number of specific markers of coniferous wood burning were identified among the chemicalcompounds. Smoke aging is accompanied by condensation of organic and inorganic compounds, transformationof aerosol surface chemistry, and the formation of the group of potassium-rich particles, all demonstrating
the complexity and variability of the chemical composition and microstructure of atmospheric aerosolpollution during Siberian forest fires.