[口头报告]On the Quasi-2-Day Planetary Waves in the Atmosphere During Different QBO Phases

On the Quasi-2-Day Planetary Waves in the Atmosphere During Different QBO Phases
编号:311 稿件编号:435 访问权限:私有 更新:2023-04-08 09:54:53 浏览:315次 口头报告

报告开始:2023年05月06日 08:35 (Asia/Shanghai)

报告时间:15min

所在会议:[11] 11、空间物理与空间探测 » [11-5] 11-5 中高层

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摘要
We found that the interannual difference of the W3 and W4 Q2DW is significantly correlated with the Quasi-Biennial Oscillation westerly (QBOW) and easterly (QBOE) phase, identified from the analysis of the 2003 to 2020 MERRA-2 and SABER atmospheric data. The amplitude of the zonal wind in the QBOE phase is approximately ∼10 m/s stronger than that in the QBOW phase. Mean zonal easterly winds are stronger in the QBOE phase than in the QBOW phase, while westerly winds are stronger in the QBOW phase. The Q2DW is present in the summer, and the background wind is easterly in both hemispheres. The mean temperature amplitudes of W3 and W4 in the QBOW phase are stronger than those in the QBOE phase, and the difference is ~2 K and ~3 K (in the Southern Hemisphere); ~2 K and ~3 K (in the Northern Hemisphere), respectively. The mean wave period of W4 in the QBOW phase in the Northern Hemisphere is shorter than that in the QBOE phase. The W3 mode is modulated by atmospheric eigenmodes in both hemispheres and shows slight differences in the QBOW and QBOE phases, while the W4 mode is more likely to show significant differences in the different QBO phases. Our diagnostic analysis suggests that the amplification of the QBOW phases W3 and W4 may be due to stronger mean-flow instabilities and background winds in the mesosphere. In addition, planetary waves gain stronger source activity during the QBOW phase to provide sufficient energy for propagation and amplification.
关键字
Quasi-2-Day Planetary Waves; QBO Phases; background wind; instability; source activity
报告人
唐梁
重庆邮电大学

稿件作者
唐梁 重庆邮电大学
谷升阳 武汉大学
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