Articles | Volume 21, issue 12
Atmos. Chem. Phys., 21, 9839–9857, 2021
Atmos. Chem. Phys., 21, 9839–9857, 2021
Research article
01 Jul 2021
Research article | 01 Jul 2021

Contributions of equatorial waves and small-scale convective gravity waves to the 2019/20 quasi-biennial oscillation (QBO) disruption

Min-Jee Kang and Hye-Yeong Chun

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Subject: Dynamics | Research Activity: Atmospheric Modelling | Altitude Range: Stratosphere | Science Focus: Physics (physical properties and processes)
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Cited articles

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Anstey, J. A., T. P. Banyard, N. Butchart, L. Coy, P. A. Newman, S. Osprey, and C. Wright: Quasi-biennial oscillation disrupted by abnormal Southern Hemisphere stratosphere, Earth and Space Science Open Archive,, (las access: 26 June 2020), 2020. 
Barton, C. A. and McCormack, J. P.: Origin of the 2016 QBO disruption and its relationship to extreme El Niño events, Geophys. Res. Lett., 44, 11150–11157,, 2017. 
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Collins, M., An, S.-I., Cai, W., Ganachaud, A., Guilyardi, E., Jin, F.-F., Jochum, M., Lengaigne, M., Power, S., Timmermann, A., Vecchi, G., and Wittenberg, A.: The impact of global warming on the tropical Pacific Ocean and El Niño, Nat. Geosci., 3, 391–297,, 2010. 
Short summary
In winter 2019/20, the westerly quasi-biennial oscillation (QBO) phase was disrupted again by easterly winds. It is found that strong Rossby waves from the Southern Hemisphere weaken the jet core in early stages, and strong mixed Rossby–gravity waves reverse the wind in later stages. Inertia–gravity waves and small-scale convective gravity waves also provide negative forcing. These strong waves are attributed to an anomalous wind profile, barotropic instability, and slightly strong convection.
Final-revised paper