Inter-annual variations of 6.5-day planetary waves and their relations with QBO  

作　　者：YingYing Huang Jun Cui HuiJun Li ChongYin Li 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]State Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100101,China [3]CAS Key Laboratory of Lunar and Deep Space Exploration,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]Planetary Environmental and Astrobiological Research Laboratory(PEARL),School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai Guangdong 519082,China [5]School of Atmospheric Sciences,Sun Yat-Sen University,Zhuhai Guangdong 519082,China [6]College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [7]LASG,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Earth and Planetary Physics》2022年第2期135-148,共14页地球与行星物理（英文版）

基　　金：jointly supported by the National Basic Research Program of China through grant 2012CB825606;the National Natural Science Foundation of China through grants 41504118,41375045,41525015,and 41774186;the Natural Science Foundation of Jiangsu Province through grants BK20150709 and BK20161531;Projects Supported by the Specialized Research Fund for State Key Laboratories。

摘　　要：This paper studies inter-annual variations of 6.5-Day Waves(6.5 DWs) observed at altitudes 20-110 km between 52°S-52°N latitudes during March 2002-January 2021, and how these variations were related to the equatorial stratospheric Quasi-Biennial Oscillation(QBO). Temperature amplitudes of the 6.5 DWs are calculated based on SABER/TIMED observations. QBO zonal winds are obtained from an ERA5 reanalysis dataset. QBO phases are derived using an Empirical Orthogonal Functions(EOF) method. Wavelet analysis of the observed 6.5 DW variations demonstrates obvious spectral maximums around 28-38 months at 32°N-52°N, and around 26-30 months at 32°S-52°S. In the Northern Hemisphere, peak periods lengthened poleward;in the Southern Hemisphere, however,they were unchanged with latitude. Residual 6.5 DWs amplitudes have been determined by removing composite amplitudes from 6.5 DWs amplitudes. Comparisons between QBO and monthly maximum residual 6.5 DWs amplitudes(AMmax) show clear correlations between the QBO and 6.5 DWs in both hemispheres, but the observed relationship is stronger in the NH. When AMmax NH, the mean QBO profile was easterly at all levels from 70 to 5 hPa;when the AMmax below 30 hPa. Linear Pearson correlation coefficients between QBO phases and AMmax 20°N-52°N in April and around 64 km at 24°S in February, and large negative values from 80 to 110 km between 20°N-50°N in August and at 96-106 km between 20°S-44°S in February. These results indicate quantitative correlations between QBO and 6.5 DWs and provide credible evidences for further studies of QBO modulations on long-term variations of 6.5 DWs.

关 键 词：planetary wave quasi-biennial osillations wave-flow interactions satellite observation 

分 类 号：P185[天文地球—天文学]