Generalization of the results of lidar monitoring of the temperature of the middle atmosphere over Tomsk

V. N. Marichev ; D. A. Bochkovsky ; A. I. Elizarov

Vestnik KRAUNC. Fiziko-matematičeskie nauki, Tome 47 (2024) no. 2, pp. 95-105

Résumé

The work carried out processing and analysis of long-term series of vertical temperature distribution in the middle atmosphere (altitude interval 15-60 km) over Tomsk, obtained on the basis of regular measurements of the lidar station of the Institute of Atmospheric Optics SB RAS for the period 2010-2023. During this period, about 1,000 individual night measurements were carried out and the corresponding total backscatter signals at a wavelength of 532 nm were accumulated and processed.. Based on the experimental data obtained, regional features of intra- and interannual variability of the thermal state of the middle atmosphere over Western Siberia were identified. For the warm period of each year (from May to September), a stable temperature distribution has been established with differences of up to several K in individual years. In spring and autumn, the difference between the average monthly temperature profiles increases to 5-10 K and in January reaches a maximum of 15 K. A fundamental difference between the vertical temperature distribution constructed from lidar data and the proposed CIRA-86 model has been revealed. From October to April, in the altitude range from 15 to 25 km, the lidar temperature profile is shifted from the model one in the negative direction, and above from 25 to 50 km, in the positive direction. The maximum negative shift in profiles is observed in December and is 16 K, and negative up to 15 K in January. A description is given of methods for analyzing a number of experimental data for the presence of values that differ significantly from the rest of the data and can lead to distortion of the results obtained.

Détail

Keywords: middle atmosphere, temperature
Mots-clés : lidar.