A westerly phase of the quasi-biennial oscillation (QBO) was disrupted in 2015/16. Previous studies have primarily focused on the cause of the localized negative momentum forcing, initiating the QBO disruption. However, the upward displacement of the westerly QBO followed by the negative momentum forcing, clearly observed in 2015/16, has received less attention. This study shows that the distinct upward propagation of the westerly winds during the 2015/16 QBO disruption was contributed by the strong Brewer-Dobson circulation (BDC). Strong Rossby waves with wavenumber 1 propagating from the troposphere mainly drove the strong BDC. Potential contributions of El Niño and Barents–Kara sea ice reduction to Rossby waves are also discussed.
|Journal||Geophysical Research Letters|
|Publication status||Published - 2022 Aug 28|
Bibliographical noteFunding Information:
This research was supported by the National Research Foundation of Korea (NRF) funded by the Korean government (MSIT) (2020R1A4A1016537) (2017R1E1A1A01074889) and Ministry of Education (2021R1I1A1A01060303). The authors thank the three anonymous reviewers for their constructive comments.
© 2022. The Authors.
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)