Aerosol microstructure and hygroscopic and absorption properties in the atmosphere of Lake Baikal and its southern coastal territory in summer 2024
V.V. Pol’kin1, S.A. Terpugova1, E.P. Yausheva1, V.P. Shmargunov1, T.V. Khodzher2, G.S. Zhamsueva3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Limnological Institute of the Siberian Branch of the RAS, Irkutsk, Russia
3Institute of Physical Material Science of the Siberian Branch of the RAS, Ulan-Ude, Russia
Keywords: aerosol, Baikal, black carbon, hygroscopicity, volatility
Abstract
It is currently relevant to study the composition and optical characteristics of aerosols in the atmosphere of Lake Baikal, a unique natural object. Results of the studies of the microstructural and physicochemical properties of near-water and near-ground aerosol in the atmosphere of the Lake Baikal basin in summer 2024 onboard the research vessel Akademik V.A. Koptyug and at the Boyarsky research station on the southeastern coast of the lake are analyzed. It is confirmed that in the absence of smoke plumes from forest wildfires, the aerosol spatial distribution over the lake and the black carbon concentration in particles are determined by the location of anthropogenic sources. The characteristics of hygroscopicity and volatility of the aerosol matter in the atmosphere of Lake Baikal depending on the particle size are studied for the first time. It is revealed that the aerosol condensation activity over the coastal zone is greater than over the lake. The results can be useful in developing regional models of atmospheric aerosol.
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