Semi-Annual variation of excited hydroxyl emission at mid-latitudes
Grygalashvyly M. Pogoreltsev A.I. Andreyev A.B. Smyshlyaev S.P. Sonnemann G.R.
26 February 2021Copernicus GmbH
Annales Geophysicae
2021#39Issue 1255 - 265 pp.
Ground-based observations show a phase shift in semi-Annual variation of excited hydroxyl (OH) emissions at mid-latitudes (43 N) compared to those at low latitudes. This differs from the annual cycle at high latitudes. We examine this behaviour by utilising an OH airglow model which was incorporated into a 3D chemistry?transport model (CTM). Through this modelling, we study the morphology of the excited hydroxyl emission layer at mid-latitudes (30? 50 N), and we assess the impact of the main drivers of its semi-Annual variation: Temperature, atomic oxygen, and air density. We found that this shift in the semi-Annual cycle is determined mainly by the superposition of annual variations of temperature and atomic oxygen concentration. Hence, the winter peak for emission is determined exclusively by atomic oxygen concentration, whereas the summer peak is the superposition of all impacts, with temperature taking a leading role.
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Leibniz Institute of Atmospheric Physics, University Rostock, Schloss-Str. 6, Ostseebad Kühlungsborn, 18225, Germany
Department of Meteorological Forecasting, Russian State Hydrometeorological University (RSHU), Saint Petersburg, Russian Federation
Institute of the Ionosphere, National Center for Space Research and Technology, Almaty, Kazakhstan
Leibniz Institute of Atmospheric Physics
Department of Meteorological Forecasting
Institute of the Ionosphere
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