ИСТИНА

Wildland fires of natural origin are a major source of carbonaceous PM in the global atmosphere. Biomass burning yields large amount of smoke aerosols, affecting the carbon emission and cycling, the radiation heat exchange in the atmosphere, and aerosol/cloud/ climate interactions. Quantification of Siberian atmosphere pollution and impacts of wildfires on changes in aerosol/climate system of subarctic regions and Arctic is one of the most important research priorities. Observations needed to develop and evaluate terrestrial and climate models are still limited, especially for Siberian boreal forest wildfires. Biomass burning aerosol may affect air quality, absorb/scatter incoming radiation, and form haze/clouds strongly dependent on physico-chemical characteristics, database for which is highly sparse for Siberian boreal forest wildfires. The impact of Russian wildfires is so large it may impact the whole of Eurasia (Popovicheva et al, Diapouli et al.,2014). It, therefore, requires a large scale collaborative effort already initiated between European, Russian Federation and Chinese Institutes (PEEX,http://www.atm.helsinki.fi/ peex/). Impacts of intense Siberian forest fires occurred in summer 2012-2013 on aerosols on regional scale are analyzed using both satellite data and background observations. We perform analysis of wildfire areas near Tomsk region and transport trajectory simulations based on synoptic maps from a HYSPLIT model and aerosol optical depth (AOD) images retrieved from (MODIS) data. Continuous scattering and absorption aerosol monitoring at the Tomsk station of IAO RAS provide the PM and BC mass concentrations which are integrated together with AOD and visibility data using a chemical transport model (GEOS-Chem) and 6S radiative transfer code. The results show the elevation of PM and BC during intensive wildfire event around the Tomsk city. Aerosol sampling and PM speciation analysis confirm the impacts of wildfires on aerosol chemistry by increasing the tracers of biomass burning such as OC/EC and molecular marker (levoglucosan) with peak daily concentration when the smoke plumes attack the city. Hazarous constituents from Siberian biomass burning such as nitrates and sulfates, acid and non acid carbonyl compounds, transitional and alkali earth metals and their soluble ionic chemical forms are released and secondary formed into atmosphere together with carbonaceous particles and ash. Carbonates are evolved due to soil dust emissions during large wildfires. These organic/inorganic species pollutions constitute an important fingerprint of Siberian biomass burning emission source of particulates in the atmosphere indicating the pathways and mechanisms of transport of organic and BC pollutants to urban environment from wildfire regions. References. [1] O. Popovicheva et al, 2014, submitted to Atmos. Environ. Physicochemical characterization of smoke aerosol during large-scale wildfires: Extreme event of August 2010 in Moscow [2] E. Diapouli et. al., 2014. Physicochemical characterization of aged biomass burning aerosol after long- range transport to Greece from large scale wildfires in Russia and surrounding regions, Summer 2010, submitted to Atmos. Environ.