Articles | Volume 24, issue 18
https://doi.org/10.5194/acp-24-10965-2024
https://doi.org/10.5194/acp-24-10965-2024
Technical note
 | 
27 Sep 2024
Technical note |  | 27 Sep 2024

Technical note: Nighttime OH and HO2 chemical equilibria in the mesosphere–lower thermosphere

Mikhail Yu. Kulikov, Mikhail V. Belikovich, Aleksey G. Chubarov, Svetlana O. Dementyeva, and Alexander M. Feigin

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The boundary of nighttime ozone chemical equilibrium as an indicator of local chemistry disturbances in the polar mesopause region
Mikhail Yu. Kulikov, Mikhail V. Belikovich, Aleksey G. Chubarov, Svetlana O. Dementyeva, and Alexander M. Feigin
EGUsphere, https://doi.org/10.5194/egusphere-2026-4117,https://doi.org/10.5194/egusphere-2026-4117, 2026
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Boundary of nighttime ozone chemical equilibrium in the mesopause region: long-term evolution determined using 20-year satellite observations
Mikhail Yu. Kulikov, Mikhail V. Belikovich, Aleksey G. Chubarov, Svetlana O. Dementyeva, and Alexander M. Feigin
Atmos. Chem. Phys., 23, 14593–14608, https://doi.org/10.5194/acp-23-14593-2023,https://doi.org/10.5194/acp-23-14593-2023, 2023
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Cited articles

Avallone, L. M. and Toohey, D. W.: Tests of halogen photochemistry using in situ measurements of ClO and BrO in the lower polar stratosphere, J. Geophys. Res., 106, 10411–1042, https://doi.org/10.1029/2000JD900831, 2001. 
Belikovich, M. V., Kulikov, M. Yu, Grygalashvyly, M., Sonnemann, G. R., Ermakova, T. S., Nechaev, A. A., and Feigin, A. M.: Ozone chemical equilibrium in the extended mesopause under the nighttime conditions, Adv. Space Res., 61, 426–432, https://doi.org/10.1016/j.asr.2017.10.010, 2018. 
Berger, U. and von Zahn, U.: Two level structure of the mesopause: A model study, J. Geophys. Res., 104, 22083–22093, 1999. 
Burkholder, J. B., Sander, S. P., Abbatt, J., Barker, J. R., Cappa, C., Crounse, J. D., Dibble, T. S., Huie, R. E., Kolb, C. E., Kurylo, M. J., Orkin, V. L., Percival, C. J., Wilmouth, D. M., and Wine, P. H.: Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies, Evaluation No. 19, JPL Publication 19-5, Jet Propulsion Laboratory, Pasadena, https://jpldataeval.jpl.nasa.gov/ (last access: 19 September 2024), 2020. 
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The assumption of chemical equilibrium is widely used to derive information about poorly measured characteristics of the mesosphere–lower thermosphere from rocket and satellite data and to study the physicochemical processes at these altitudes. In this work, we analyze the fundamental aspects of chemical equilibria of two important trace gases and discuss their possible applications.
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