Stratospheric influence on the mesosphere–lower thermosphere over mid latitudes in winter observed by a Fabry–Perot interferometer
<p>In this paper, we study the response of the mesosphere–lower thermosphere (MLT) to sudden stratospheric warmings (SSWs) and the activity of planetary waves (PWs). We observe the 557.7 nm optical emission to retrieve the MLT wind and temperature with the only Fabry–Perot interferometer (FPI)...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://angeo.copernicus.org/articles/39/267/2021/angeo-39-267-2021.pdf |
| Summary: | <p>In this paper, we study the response of the mesosphere–lower thermosphere (MLT) to sudden stratospheric warmings (SSWs) and the activity
of planetary waves (PWs). We observe the 557.7 nm optical emission to
retrieve the MLT wind and temperature with the only Fabry–Perot interferometer (FPI) in Russia. The FPI is located at the mid latitudes of
eastern Siberia within the Tory Observatory (TOR) at the Institute of Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS, 51.8<span class="inline-formula"><sup>∘</sup></span> N, 103.1<span class="inline-formula"><sup>∘</sup></span> E). Regular interferometer monitoring
started in December 2016. Here, we address the temporal variations in the
557.7 nm emission intensity as well as the variations in wind and temperature measured during the 2016–2020 winters. Both SSWs and PWs appear
to have equally strong effects in the upper atmosphere. When the 557.7 nm
emission decreases due to some influences from below (SSWs or PWs), the
temperature increases significantly, as does its variability. The dispersion
of zonal wind does not show significant PW- and SSW-correlated variations, but the dominant MLT zonal wind reverses during major SSW events
simultaneously with the averaged zonal wind at 60<span class="inline-formula"><sup>∘</sup></span> N in the stratosphere.</p> |
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| ISSN: | 0992-7689 1432-0576 |