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Preprints
https://doi.org/10.5194/egusphere-2024-1662
https://doi.org/10.5194/egusphere-2024-1662
05 Jun 2024
 | 05 Jun 2024

The impact of QBO disruptions on diurnal tides over the low- and mid-latitude MLT region observed by a meteor radar chain

Jianyuan Wang, Na Li, Wen Yi, Xianghui Xue, Iain Reid, Jianfei Wu, Hailun Ye, Jian Li, Zonghua Ding, Jinsong Chen, Guozhu Li, Yaoyu Tian, Boyuan Chang, Jiajing Wu, and Lei Zhao

Abstract. A quasi-biennial oscillation (QBO) disruption is a very rare phenomenon in which QBO westward wind is temporarily interrupted by the occurrence of a band of westward wind in the tropical stratosphere. This phenomenon is important as it could greatly affect the global atmospheric circulation, especially in the mesosphere. Past observational and modelling studies have shown the QBO-varying mesospheric diurnal tide, but the mechanism is still not fully understood. In this study, we report the strong response of mesospheric diurnal tides to the two QBO disruptions that occurred in 2015/16 and 2019/20 and its possible mechanisms. The diurnal tidal winds are observed by a meteor radar chain, consisting of meteor radars located at Kunming (25.6° N, 103.8° E), Wuhan (30.5° N, 114.2° E), Mengcheng (33.4° N, 116.5° E), Beijing (40.3° N, 116.2° E) and Mohe (53.5° N, 122.3° E) in China. These observations provide clear evidence that mesospheric diurnal tides are unusually weakened (by ~-6 m/s) during these QBO disruptions, over Kunming, Wuhan, Mengcheng, and Beijing. By using the Specific Dynamics version of the Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (SD-WACCM-X) and the European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis v5 (ERA5) dataset, the analysis indicates that the QBO wind affects mid-latitude mesospheric diurnal tides by modulating both the solar radiative absorption by subtropical stratospheric ozone (~5 to 0.5 hPa) and the tidal-gravity wave interaction in the mesosphere (~60 to 100 km). Thus, these unexpected QBO disruptions provide an opportunity to better understand the coupling between climate change and middle atmospheric dynamics.

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Journal article(s) based on this preprint

02 Dec 2024
The impact of quasi-biennial oscillation (QBO) disruptions on diurnal tides over the low- and mid-latitude mesosphere and lower thermosphere (MLT) region observed by a meteor radar chain
Jianyuan Wang, Na Li, Wen Yi, Xianghui Xue, Iain M. Reid, Jianfei Wu, Hailun Ye, Jian Li, Zonghua Ding, Jinsong Chen, Guozhu Li, Yaoyu Tian, Boyuan Chang, Jiajing Wu, and Lei Zhao
Atmos. Chem. Phys., 24, 13299–13315, https://doi.org/10.5194/acp-24-13299-2024,https://doi.org/10.5194/acp-24-13299-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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The mesospheric diurnal tides over low- and mid-latitude region are suppressed during the QBO...
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