Articles | Volume 20, issue 14
https://doi.org/10.5194/acp-20-8691-2020
https://doi.org/10.5194/acp-20-8691-2020
Research article
 | 
22 Jul 2020
Research article |  | 22 Jul 2020

Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica – Part 2: Evidence of a quasi-quadrennial oscillation (QQO) in the polar mesosphere

W. John R. French, Andrew R. Klekociuk, and Frank J. Mulligan

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Short summary
We explore a quasi-quadrennial oscillation (QQO; 3–4 K amplitude, ~ 4-year period) in mesopause region temperatures observed in 24 years of hydroxyl airglow measurements over Davis, Antarctica (68° S, 78° E). Correlation and composite analysis using meteorological reanalysis and satellite data reveals complex patterns on the QQO timescale in both hemispheres. Modulation of the meridional circulation, linked to the propagation of gravity waves, plays a significant role in producing the QQO response.
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