Articles | Volume 20, issue 11
Atmos. Chem. Phys., 20, 6541–6561, 2020
https://doi.org/10.5194/acp-20-6541-2020
Atmos. Chem. Phys., 20, 6541–6561, 2020
https://doi.org/10.5194/acp-20-6541-2020

Research article 05 Jun 2020

Research article | 05 Jun 2020

On the forcings of the unusual Quasi-Biennial Oscillation structure in February 2016

Haiyan Li et al.

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Haiyan Li on behalf of the Authors (31 Jan 2020)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (01 Apr 2020) by Timothy J. Dunkerton
RR by Anonymous Referee #2 (01 Apr 2020)
RR by Anonymous Referee #3 (10 Apr 2020)
RR by Anonymous Referee #1 (13 Apr 2020)
ED: Publish as is (27 Apr 2020) by Timothy J. Dunkerton
AR by Haiyan Li on behalf of the Authors (06 May 2020)  Author's response    Manuscript
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Short summary
The QBO westerly phase was reversed by an unexpected easterly jet near 40 hPa and the westerly zonal wind lasted an unusually long time at 20 hPa during winter 2015/16. We find that quasi-stationary Rossby wave W1 and faster Rossby wave W2 propagating from the northern extratropics and a locally generated Rossby wave W3 were important contributors to the easterly jet at 40 hPa. Our results suggest that the unusual zonal wind structure at 20 hPa could be caused by enhanced Kelvin wave activity.
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