The winter of 2022-2023 was characterized by intense dynamic processes associated with the formation of blocks in the middle troposphere and the occurrence of sudden stratospheric warmings (SSW) in the stratosphere. The SSW event in January-February 2023 is likely related to prolonged blocking over the Urals and Europe in the second half of January. Lidar measurements of atmospheric temperature based on the use of pure rotational raman spectra on nitrogen and oxygen molecules at altitudes up to 70 km in the Akademgorodok area of Tomsk during the SSW period, and their comparison with WACCM model data and satellite Aura data showed a number of characteristic features associated with changes in the structure of the stratopause due to SSW.
The paper deals with long-term means of 557.7 nm atomic oxygen emission intensity [OI], air temperature and wind speed within the mesopause over the southern regions of East Siberia. Data on temperature and emission parameters were obtained from SABER/TIMED radiometer, KEO Scientific «Arinae» Fabry–Pérot interferometer, SATI spectrometer and NRLMSIS model over the Tory Geophysical Observatory (52° N, 103° E). Annual variations of 557.7 nm emission intensity and temperature obtained in observations differs from model approximations. Potential reasons for the revealed discrepancies are discussed.
The work is devoted to the comparison of the night airglow intensity of atomic oxygen in the mesopause region, obtained by satellite and ground-based methods. Satellite data used in this work were obtained using a SABER limb radiometer operating on the TIMED platform, ground monitoring data were obtained using a Fabry-Perot KEO Scientific “Arinae” interferometer, adapted for aeronomic research. The profile of the natural green glow intensity of the upper atmosphere is calculated on the basis of the profile of the atomic oxygen concentration. The chemical composition and air temperature data, at mesopause region, obtained by the SABER are used to calculate the profiles. The nighttime emission intensity of 557.7 nm, obtained in this way from satellite data, is in good agreement with the results of ground-based observations.
We studied the temperature and the emission of 557.7 nm in the MLT in the geophysical observatory “Tory” (51.8N, 103.1E) during winter 2018-2019. For analysis, we used the measurement data of the Fabry-Perot interferometer (FPI), the SABER/TIMED data, the data of the model of middle and upper atmosphere (MUAM) and the data of the ERAinterim archive. It turned out that MLT emission is decreases during an increase in the amplitude of a stationary planetary wave with a zonal wave number 1 in the stratosphere, as well as during sudden stratospheric warmings. However, the temperature according to the FPI data increases, and according to the SABER data temperature decreases during these events in the stratosphere. In this paper we discuss the reasons for these differences, which are caused by a variation in the height of the emission layer and by the features of the SABER observations. The MUAM data confirm our assumptions about the reasons for the differences between SABER and FPI temperature.
The mesosphere and lower thermosphere are the least studied areas of the earth atmosphere. The reason for this is the lack of monitoring. We have instrument for measuring wind speed - the Fabry-Perot interferometer of the ISTP SB RAS which was used for study atmosphere dynamics in two winter periods - 2016/2017 and 2017/2018. Sudden stratospheric warming's (SSW) are investigated according to the ERA-Interim reanalysis archive. In 2017 and 2018, the interferometer data on wind speed at an altitude of 90 km showed a responses to the SSW, with different vertical and horizontal structure, which were occurred at the different of the quasi-biennial oscillation phases.
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