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https://doi.org/10.5194/egusphere-2024-1662
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2024-1662
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
05 Jun 2024
| 05 Jun 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
The impact of QBO disruptions on diurnal tides over the low- and mid-latitude MLT region observed by a meteor radar chain
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.
How to cite. Wang, J., Li, N., Yi, W., Xue, X., Reid, I., Wu, J., Ye, H., Li, J., Ding, Z., Chen, J., Li, G., Tian, Y., Chang, B., Wu, J., and Zhao, L.: The impact of QBO disruptions on diurnal tides over the low- and mid-latitude MLT region observed by a meteor radar chain, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-1662, 2024.
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Jianyuan Wang
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Kunming Electro-magnetic Environment Observation and Research Station, Qujing 655500, China
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Kunming Electro-magnetic Environment Observation and Research Station, Qujing 655500, China
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
Hefei National Laboratory, University of Science and Technology of China, Hefei, China
Collaborate Innovation Center of Astronautical Science and Technology, Harbin 150001, China
Iain Reid
ATRAD Pty Ltd., Adelaide, SA 5032, Australia
School of Physical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
Jianfei Wu
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
Hailun Ye
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
Jian Li
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China, Hefei, China
Zonghua Ding
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Kunming Electro-magnetic Environment Observation and Research Station, Qujing 655500, China
Jinsong Chen
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Kunming Electro-magnetic Environment Observation and Research Station, Qujing 655500, China
Guozhu Li
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
Yaoyu Tian
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Boyuan Chang
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Jiajing Wu
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Lei Zhao
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Kunming Electro-magnetic Environment Observation and Research Station, Qujing 655500, China
Short summary
The mesospheric diurnal tides over low- and mid-latitude region are suppressed during the QBO disruptions and QBO westward wind phase, and are enhanced during QBO eastward wind phase, observed by a meteor radar chain. By using SD-WACCM-X simulations and ERA5 reanalysis, it is found that the stratospheric QBO winds affect the mesospheric diurnal tides by modulating the subtropical ozone variability in the upper stratosphere and the interaction between tides and gravity waves in the mesosphere.
The mesospheric diurnal tides over low- and mid-latitude region are suppressed during the QBO...