Lidar study of the thermal regime of the middle atmosphere over Tomsk in 2023-2024
V.N. Marichev, D.A. Bochkovsky
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: middle atmosphere, aerosol, temperature, lidar
Abstract
The paper presents results of lidar monitoring of the atmosphere over Tomsk in winter 2023/24. The work studies the thermal regime of the middle atmosphere with emphasis on disturbances in the stratosphere caused by sudden stratospheric warmings (SSWs), including statistics on the vertical temperature distribution (VTD) for further analysis. During this period, 90 temperature profiles were calculated from lidar returns of molecular (Rayleigh) and spontaneous Raman scattering in the altitude range from 10 to 70 km. The annual cycle of the vertical temperature distribution is characterized by stratospheric warmings and their destruction in winter and spring, VDT stabilization in warm season, and VTD destabilization in fall with transition to winter SSW phase. In most cases, the vertical temperature distribution in April-October was in good agreement with the model distribution. It has been found that during two stratospheric warming events in winter 2023/24, a splitting of circumpolar vortices occurred at the time of their maximum manifestation (on December 13, 2023, and February 18, 2024). The results are particularly interesting for understanding climate change in Western Siberia.
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