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This paper reports on a project to compare the representation of the semiannual oscillation (SAO) among six major global atmospheric reanalyses and with recent satellite observations. The differences among the zonal mean zonal wind as represented by the various reanalyses display a prominent equatorial maximum that increases with height. It is shown that assimilation of satellite temperature measurements is crucial for the realistic representation of the tropical upper stratospheric circulation.
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ACP | Articles | Volume 20, issue 14
Atmos. Chem. Phys., 20, 9115–9133, 2020
https://doi.org/10.5194/acp-20-9115-2020

Special issue: The SPARC Reanalysis Intercomparison Project (S-RIP) (ACP/ESSD...

Atmos. Chem. Phys., 20, 9115–9133, 2020
https://doi.org/10.5194/acp-20-9115-2020

Research article 31 Jul 2020

Research article | 31 Jul 2020

Representation of the equatorial stratopause semiannual oscillation in global atmospheric reanalyses

Yoshio Kawatani et al.

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Cited articles

Baldwin, M. P. and Gray, L. J.: Tropical stratospheric zonal winds in ECMWF ERA-40 reanalysis, rocketsonde data, and rawinsonde data, Geophys. Res. Lett., 32, L09806, https://doi.org/10.1029/2004GL022328, 2005. 
Coy, L., Wargan, K., Molod, A., McCarty, W., and Pawson, S: Structure and dynamics of the quasi-biennial oscillation in MERRA-2, J. Climate, 29, 5339–5354, https://doi.org/10.1175/JCLI-D-15-0809.1, 2016. 
Dunkerton, T. J.: On the role of the Kelvin waves in the westerly phase of the semiannual zonal wind oscillation, J. Atmos. Sci., 36, 32–41, 1979. 
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Short summary
This paper reports on a project to compare the representation of the semiannual oscillation (SAO) among six major global atmospheric reanalyses and with recent satellite observations. The differences among the zonal mean zonal wind as represented by the various reanalyses display a prominent equatorial maximum that increases with height. It is shown that assimilation of satellite temperature measurements is crucial for the realistic representation of the tropical upper stratospheric circulation.
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