资源环境科技发展态势分析平台

Mesospheric winds from three longitudinal sectors at 65^°N and 54^°N latitude are combined to diagnose the zonal wavenumbers (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 semi‐diurnal tides with m=1, 2, 3 (SW1, SW2, and SW3), lunar semi‐diurnal 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, i.e., the energy goes first from SW2 to Q10DW and LSB, and then from SW2 and Q10DW to USB. Our results illustrate the interactions can explain most wind variabilities associated with the SSW.