Numerous wildfire events were detected in summer 2019 in Siberia and in Canada. Lidar observations in Tomsk in August 2019 revealed strong layers of aerosol scattering in the lower stratosphere. Results of the calculation of backward trajectories of air masses and relevant analysis are presented, involving the satellite radiometric data on fire events along with the data from the CALIOP space lidar on the aerosol. It is demonstrated that the observed aerosol layers originated from the pyrocumulus emissions arising from forest fire events in Siberia and Canada.
Some peaks of aerosol scattering have been observed by the lidar in the stratosphere over Tomsk in August and December 2017. Using the results of air mass trajectory calculations and the satellite data on the air mass temperature along these trajectories, it have been concluded that the aerosol observed in August 2017 was of a volcanic origin (Shiveluch volcano, Kamchatka), and the aerosol observed in December 2017 represented the polar stratospheric clouds.
The Lagrangian particle trajectories method has been used to analyze the transport of volcanic aerosol in the atmosphere after the eruptions of Grimsvötn and Nabro volcanoes in the summer of 2011. After the Grimsvötn volcano eruption it was impossible to distinguish the volcanic aerosol appearance from the background aerosol over Tomsk and Vladivostok by the lidar observations. At that time there was a strong horizontal mixing in the atmosphere of the Northern Hemisphere, associated with the polar vortex disintegration. The Nabro volcanic aerosol was clearly manifested by the aerosol scattering peaks above Vladivostok and Tomsk.
In 26-28 January 2016 aerosol scattering peaks were registered in the stratosphere above Tomsk. On the basis of air-mass back trajectory calculations and the analysis of temperature data along these trajectories it was assumed that the observed aerosol characterized as polar stratospheric clouds. This report presents a preliminary interpretation of the observations.
The analysis of the stratospheric aerosol origin was carried out by the method of Lagrangian particle trajectories. Stratospheric aerosol was registered by lidar sounding of atmosphere above Tomsk in 2008-2013 in summer time. The analysis of the results had shown that the aerosol content at altitudes of 13-125 km with maximum at 16-18 km can be associated with aerosol transfer from tropical stratospheric reservoir.
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