Ozone chemical equilibrium in the extended mesopause under the nighttime conditions |
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Authors: | MV Belikovich MYu Kulikov M Grygalashvyly GR Sonnemann TS Ermakova AA Nechaev AM Feigin |
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Institution: | 1. Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov Str., 603950 Nizhny Novgorod, Russia;2. Leibniz-Institute of Atmospheric Physics at the University Rostock in Kühlungsborn, Schloss-Str. 6, 18225 Ostseebad Kühlungsborn, Germany;3. Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina, 603950 Nizhny Novgorod, Russia |
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Abstract: | For retrieval of atomic oxygen and atomic hydrogen via ozone observations in the extended mesopause region (~70–100?km) under nighttime conditions, an assumption on photochemical equilibrium of ozone is often used in research. In this work, an assumption on chemical equilibrium of ozone near mesopause region during nighttime is proofed. We examine 3D chemistry-transport model (CTM) annual calculations and determine the ratio between the correct (modeled) distributions of the O3 density and its equilibrium values depending on the altitude, latitude, and season.The results show that the retrieval of atomic oxygen and atomic hydrogen distributions using an assumption on ozone chemical equilibrium may lead to large errors below ~81–87?km. We give simple and clear semi-empirical criterion for practical utilization of the lower boundary of the area with ozone’s chemical equilibrium near mesopause. |
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Keywords: | Middle atmosphere Composition and structure Chemistry Measurements Modeling |
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