期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 16, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL100101
关键词
quasi-biennial oscillation; QBO disruption; Brewer-Dobson circulation
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1A4A1016537, 2017R1E1A1A01074889]
- Ministry of Education [2021R1I1A1A01060303]
- National Research Foundation of Korea [2020R1A4A1016537] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study reveals that the distinct upward propagation of the westerly winds during the 2015/16 QBO disruption was mainly driven by strong Rossby waves with wavenumber 1 from the troposphere, contributing to the strong Brewer-Dobson circulation (BDC).
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 Nino and Barents-Kara sea ice reduction to Rossby waves are also discussed.
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