Role of QBO and MJO in Sudden Stratospheric Warmings: A Case Study

被引：0
作者：
Sunkara, Eswaraiah [1 ]
Seo, Kyong-Hwan [2 ,3 ]
Mengist, Chalachew Kindie [4 ]
Ratnam, Madineni Venkat [5 ]
Niranjan Kumar, Kondapalli [6 ]
Venkata Chalapathi, Gasti [7 ]
机构：
[1] Department of Physics, Mohan Babu University, Sree Sainath Nagar, Tirupati
[2] Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University, Busan
[3] Institute for Future Earth, Pusan National University, Busan
[4] BK21 School of Earth and Environmental Systems, Pusan National University, Busan
[5] National Atmospheric Research Laboratory, Gadanki
[6] National Centre for Medium Range Weather Forecasting, Ministry of Earth Sciences, Noida
[7] Department of Physics, Goverment Degree College, Anantapur
来源：
Atmosphere | 2024年 / 15卷 / 12期
基金：
新加坡国家研究基金会;
关键词：
MJO; NAM index; QBO; SSW;
D O I：
10.3390/atmos15121458
中图分类号：
学科分类号：
摘要：
The impact of the quasi-biennial oscillation (QBO) and Madden–Julian oscillation (MJO) on the dynamics of major sudden stratospheric warmings (SSWs) observed in the winters of 2018, 2019, and 2021 is investigated. Using data from the MERRA-2 reanalysis, we analyze the daily mean variability of critical atmospheric parameters at the 10 hPa level, including zonal mean polar cap temperature, zonal mean zonal wind, and the amplitudes of planetary waves 1 and 2. The results reveal dramatic increases in polar cap temperature and significant wind reversals during the SSW events, particularly in 2018. The analysis of planetary wave (PW) amplitudes demonstrates intensified wave activity coinciding with the onset of SSWs, underscoring the pivotal role of PWs in these stratospheric disruptions. Further examination of outgoing long-wave radiation (OLR) anomalies highlights the influence of QBO phases on tropical convection patterns. During westerly QBO (w-QBO) phases, enhanced convective activity is observed in the western Pacific, whereas the easterly QBO (e-QBO) phase shifts convection patterns to the maritime continent and central Pacific. This modulation by QBO phases influences the MJO’s role during SSWs, affecting tropical and extra-tropical weather patterns. The day-altitude variability of upward heat flux reveals distinct spatiotemporal patterns, with pronounced warming in the polar regions and mixed heat flux patterns in low latitudes. The differences observed between the SSWs of 2017–2018 and 2018–2019 are likely related to the varying QBO phases, emphasizing the complexity of heat flux dynamics during these events. The northern annular mode (NAM) index analysis shows varied responses to SSWs, with stronger negative anomalies observed during the e-QBO phase compared to the w-QBO phases. This variability highlights the significant role of the QBO in shaping the stratospheric and tropospheric responses to SSWs, impacting surface weather patterns and the persistence of stratospheric anomalies. Overall, the study demonstrates the intricate interactions between stratospheric dynamics, QBO, and MJO during major SSW events, providing insights into the broader implications of these atmospheric phenomena on global weather patterns. © 2024 by the authors.
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