Studying MLT temperature and composition during stratospheric warming events from spectrometric observations of OH (6-2) airglow emission at mid-latitudes

摘要

We present the results of studying the temperature regime and the composition of the mid-latitude atmosphere at themesopause heights during the periods of minor and final stratospheric warmings in February-March 2016. We used thedata from the spectrometric observations of the hydroxyl emission at the Geophysical Observatory (Tory, 51.8°N,103.1°E ) of the Institute of Solar-Terrestrial Physics (Irkutsk) and at Zvenigorod station (55.7º N, 36.8º E) of the A.M.Obukhov Institute of Atmospheric Physics (Moscow). The technique for calculating the concentrations of atomic oxygenand ozone at the OH emission layer using experimental data on the emission intensity and rotational temperature of theOH molecule, the photochemical model of OH radiation, and MSISE-E-90 model is described. It was found, that duringthe periods of analyzed stratospheric warmings significant, up to 250%, variations in the OH emission intensity andconcentrations of atomic oxygen and ozone in the mesopause region were observed. The longitudional differences in theeffects of the stratospheric warmings on the characteristics of the mesopause region were revealed.