Preprints
https://doi.org/10.5194/egusphere-2023-285
https://doi.org/10.5194/egusphere-2023-285
07 Mar 2023
 | 07 Mar 2023

Aeolus wind lidar observations of the 2019/2020 Quasi-Biennial Oscillation disruption with comparison to radiosondes and reanalysis

Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, and Neal Butchart

Abstract. The quasi-biennial oscillation (QBO) was unexpectedly disrupted for only the second time in the historical record during the 2019/20 boreal winter. As the dominant mode of atmospheric variability in the tropical stratosphere, and a significant source of seasonal predictability globally, understanding the drivers behind this unusual behaviour is very important. Here, novel data from Aeolus, the first Doppler wind lidar in space, is used to observe the 2019/20 QBO disruption. Aeolus is the first satellite able to observe winds at high resolution on a global scale, and is therefore a uniquely capable platform for studying the evolution of the disruption and the broader circulation changes triggered by it. This study therefore contains the first direct wind observations of the QBO from space, and exploits measurements from a special Aeolus scanning mode, implemented to observe this disruption as it happened. Aeolus observes easterly winds of up to 20 ms−1 in the core of the disruption jet during July 2020. By co-locating with radiosonde measurements from Singapore and ERA5 reanalysis, like-for-like comparisons of the observed wind structures in the tropical stratosphere are produced, showing equatorial Kelvin wave activity and key parts of the Walker Circulation during the disruption period. The onset of the disruption easterly jet occurs 5 days earlier in Aeolus observations compared with the reanalysis. This analysis highlights how Aeolus and future Doppler wind lidar satellites can deepen our understanding of the QBO, its disruptions, and the tropical upper-troposphere lower-stratosphere region more generally.

Journal article(s) based on this preprint

27 Feb 2024
Aeolus wind lidar observations of the 2019/2020 quasi-biennial oscillation disruption with comparison to radiosondes and reanalysis
Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, Neal Butchart, Martina Bramberger, and M. Joan Alexander
Atmos. Chem. Phys., 24, 2465–2490, https://doi.org/10.5194/acp-24-2465-2024,https://doi.org/10.5194/acp-24-2465-2024, 2024
Short summary
Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, and Neal Butchart

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-285', Anonymous Referee #1, 11 Apr 2023
  • RC2: 'Comment on egusphere-2023-285', Anonymous Referee #2, 18 Apr 2023
  • RC3: 'Comment on egusphere-2023-285', Anonymous Referee #3, 20 Apr 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-285', Anonymous Referee #1, 11 Apr 2023
  • RC2: 'Comment on egusphere-2023-285', Anonymous Referee #2, 18 Apr 2023
  • RC3: 'Comment on egusphere-2023-285', Anonymous Referee #3, 20 Apr 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Timothy Banyard on behalf of the Authors (22 Aug 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (11 Sep 2023) by Peter Haynes
RR by Anonymous Referee #3 (30 Sep 2023)
RR by Anonymous Referee #2 (05 Oct 2023)
ED: Publish subject to minor revisions (review by editor) (17 Oct 2023) by Peter Haynes
AR by Timothy Banyard on behalf of the Authors (24 Nov 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (13 Dec 2023) by Peter Haynes
AR by Timothy Banyard on behalf of the Authors (23 Dec 2023)  Manuscript 

Journal article(s) based on this preprint

27 Feb 2024
Aeolus wind lidar observations of the 2019/2020 quasi-biennial oscillation disruption with comparison to radiosondes and reanalysis
Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, Neal Butchart, Martina Bramberger, and M. Joan Alexander
Atmos. Chem. Phys., 24, 2465–2490, https://doi.org/10.5194/acp-24-2465-2024,https://doi.org/10.5194/acp-24-2465-2024, 2024
Short summary
Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, and Neal Butchart
Timothy P. Banyard, Corwin J. Wright, Scott M. Osprey, Neil P. Hindley, Gemma Halloran, Lawrence Coy, Paul A. Newman, and Neal Butchart

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Short summary
During 2019/20 the tropical stratospheric wind phenomenon known as the quasi-biennial oscillation (QBO) was disrupted for only the second time in the historical record. We use novel measurements from the first Doppler wind lidar in space, Aeolus, to observe this disruption in an unprecedented way. Our study demonstrates Aeolus' capability to measure tropical waves during the disruption, and reveals important differences between Aeolus and ERA5 reanalysis in the timing of the disruption onset.