Quasi‐10‐Day Wave and Semidiurnal Tide Nonlinear Interactions During the Southern Hemispheric SSW 2019 Observed in the Northern Hemispheric Mesosphere
Quasi‐10‐Day Wave and Semidiurnal Tide Nonlinear Interactions During the Southern Hemispheric SSW 2019 Observed in the Northern Hemispheric Mesosphere
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DOI：
10.1029/2020gl091453
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发表时间：
2020-08
影响因子：
5.2
通讯作者：
M. He;J. Chau;J. Forbes;D. Thorsen;Guozhu Li;T. A. Siddiqui;Y. Yamazaki;W. Hocking
中科院分区：
文献类型：
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作者：
M. He;J. Chau;J. Forbes;D. Thorsen;Guozhu Li;T. A. Siddiqui;Y. Yamazaki;W. Hocking
结合65 ° N和54 ° N纬度三个纵向扇区的中间层风，诊断2019年南半球平流层突然变暖（SSW）期间谱波特征的纬向波数（m）。诊断的是准10天和6天行星波（Q10DW和Q6DW，m = 1），太阳半日潮（m = 1，2，3）（SW1，SW2和SW3），月球半日潮，以及Q10DW-SW2非线性相互作用的上下边带（USB和LSB，m = 1和3）。我们进一步提出了7年的综合分析，以区分SSW的气候特征的影响。在SSW爆发前（后），LSB（USB）增强，Q10DW增强（减弱），SW2气候极大值减弱。这些行为可以用Manley-Rowe关系来解释，即能量首先从SW2到Q10DW和LSB，然后从SW2和Q10DW到USB。我们的结果表明，相互作用可以解释大多数风变率与SSW。
Mesospheric winds from three longitudinal sectors at 65°N and 54°N latitude are combined to diagnose the zonal wave numbers (m) of spectral wave signatures during the Southern Hemisphere sudden stratospheric warming (SSW) 2019. Diagnosed are quasi‐10‐ and 6‐day planetary waves (Q10DW and Q6DW, m = 1), solar semidiurnal tides with m = 1, 2, 3 (SW1, SW2, and SW3), lunar semidiurnal tide, and the upper and lower sidebands (USB and LSB, m = 1 and 3) of Q10DW‐SW2 nonlinear interactions. We further present 7‐year composite analyses to distinguish SSW effects from climatological features. Before (after) the SSW onset, LSB (USB) enhances, accompanied by the enhancing (fading) Q10DW, and a weakening of climatological SW2 maximum. These behaviors are explained in terms of Manley‐Rowe relation, that is, the energy goes first from SW2 to Q10DW and LSB, and then from SW2 and Q10DW to USB. Our results illustrate that the interactions can explain most wind variabilities associated with the SSW.