Articles | Volume 20, issue 14
Atmos. Chem. Phys., 20, 8691–8708, 2020
https://doi.org/10.5194/acp-20-8691-2020
Atmos. Chem. Phys., 20, 8691–8708, 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 et al.

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Cited articles

Baldwin, M. P., Birner, T., Brasseur, G., Burrows, J., Butchart, N., Garcia, R., Geller, M., Gray, L., Hamilton, K., Harnik, N., Hegglin, M. I., Langematz, U., Robock, A., Sato, K., and Scaife, A.: 100 Years of Progress in Understanding the Stratosphere and Mesosphere, Meteorol. Monogr., 59, 27.1–27.62, https://doi.org/10.1175/amsmonographs-d-19-0003.1, 2019. 
Brasseur, G. and Solomon, S.: Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere, Springer Nature, Dordrecht, the Netherlands, https://doi.org/10.1007/1-4020-3824-0, 2005. 
Burns, G. and French, J.: Rotational temperature studies of the hydroxyl airglow layer above Davis, Antarctica, Ver. 8, Australian Antarctic Data Centre – https://data.aad.gov.au/metadata/records/Davis_OH_airglow (last access: 3 July 2020), 2002. 
Copernicus Climate Change Service (C3S): ERA5: Fifth generation of ECMWF atmospheric reanalyses of the global climate, Copernicus Climate Change Service Climate Data Store (CDS), available at: https://cds.climate.copernicus.eu/cdsapp#!/home (last access: 3 July 2020), 2017. 
Cosentino, R. G., Morales-Juberías, R., Greathouse, T., Orton, G., Johnson, P., Fletcher, L. N., and Simon, A.: New Observations and Modeling of Jupiter's Quasi-Quadrennial Oscillation, J. Geophys. Res.-Planet., 122, 2719–2744, https://doi.org/10.1002/2017JE005342, 2017. 
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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