Spatial distribution of potential sources of carbonaceous aerosols in central Siberia
S.S. Vlasenko, A.S. Mikhailova, O.A. Ivanova, E.Yu. Nebosko, E.F. Mikhailov, T.I. Ryshkevich
Saint-Petersburg State University, St. Petersburg, Russia
Keywords: atmospheric composition, carbonaceous aerosol, trajectory method, elemental carbon, organic carbon
Abstract
We present the results of trajectory analysis of multi-year measurements of organic (OC) and elemental (EC) carbon in aerosols sampled on quartz filters from a height of 300 m at ZOTTO station. The EC and OC concentrations were determined by the thermo-optical method. The obtained time series were supplemented with the HYSPLIT backward trajectories. As a result the CWT and PSCF functions were calculated on a grid of 150 ´ 250 cells covering the geographical area 30 ´ 20° with the center in Zotino. These functions characterize the intensity of potential sources of carbon-containing aerosols for a given cell. The results allow us to identify the areas with the strongest organic and elemental carbon emissions and to estimate the seasonal variability of these emissions. In particular, in summer, the main sources of OC and EC are located to the east of Zotino, in the Podkamennaya Tunguska River region, and are most likely associated with forest fires. During the cold seasons, the sources of aerosol carbon dominate in the southwestern part of the geographical area under study, where large cities are located and the bulk of the population is concentrated. It is shown that regression analysis of CWT functions of organic and elemental carbon allows one in some cases to determine the dominant type of sources of carbonaceous aerosols. Our results can be used for estimation of aerosol radiative forcing in Siberia.
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