Results of observations of aerosol from North American forest fires in the stratosphere over Tomsk in late summer and fall of 2017
A.V. Nevzorov1, S.I. Dolgii1, A.P. Makeev1,2, A.V. El’nikov3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050, Russia
3Surgut State University, 1, Lenin Avenue, Surgut, 628403, Russia
Keywords: лидар, лазерное зондирование атмосферы, вертикальное распределение стратосферного аэрозоля, lidar, laser sounding of atmosphere, stratospheric ozone vertical distribution
Abstract
In the work, we present the observations of anomalous aerosol layers in the stratosphere over Tomsk (56.5°N, 85.0°E), performed at the Siberian Lidar Station, Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences at two wavelengths (355 and 532 nm) in the summer-fall period of 2017, as well as the trajectory analysis of their motion. The trajectory analysis shows that these aerosol layers in the stratosphere over Tomsk were due to forest fires in the region of the Lake Athabasca (Canada) occurred in mid-August. The analysis of observations on the basis of Ångström parameter allowed us to conjecture that, within assumptions described in the paper, the Ångström parameter of the background ensemble of scattering particles in the stratosphere is X » 2.8. It is noteworthy that the values of Ångström parameter ( X = 1 ¸ 2.5), obtained at altitudes where aerosol layers were located, were characteristic for soot aerosol.
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