Distinct Upward Propagation of the Westerly QBO in Winter 2015/16 and Its Relationship With Brewer-Dobson Circulation

Min Jee Kang; Seok Woo Son; Hye Yeong Chun

doi:10.1029/2022GL100101

Distinct Upward Propagation of the Westerly QBO in Winter 2015/16 and Its Relationship With Brewer-Dobson Circulation

Min Jee Kang, Seok Woo Son, Hye Yeong Chun

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	e2022GL100101
Journal	Geophysical Research Letters
Volume	49
Issue number	16
DOIs	https://doi.org/10.1029/2022GL100101
Publication status	Published - 2022 Aug 28

Bibliographical note

Funding 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.

Publisher Copyright:
© 2022. The Authors.

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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10.1029/2022GL100101

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title = "Distinct Upward Propagation of the Westerly QBO in Winter 2015/16 and Its Relationship With Brewer-Dobson Circulation",

abstract = "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 Ni{\~n}o and Barents–Kara sea ice reduction to Rossby waves are also discussed.",

author = "Kang, {Min Jee} and Son, {Seok Woo} and Chun, {Hye Yeong}",

note = "Funding 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. Publisher Copyright: {\textcopyright} 2022. The Authors.",

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doi = "10.1029/2022GL100101",

language = "English",

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N1 - Funding 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. Publisher Copyright: © 2022. The Authors.

PY - 2022/8/28

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N2 - 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.

AB - 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.

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Distinct Upward Propagation of the Westerly QBO in Winter 2015/16 and Its Relationship With Brewer-Dobson Circulation

Abstract

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