Seasonal and Quasi-Biennial Oscillation Control of Quasi-Two-Day Wave Variability

This study investigates the modulation of the Quasi-Two-Day Wave (Q2DW) by the Quasi-Biennial Oscillation (QBO) in the mesosphere and lower thermosphere during 2012–2019, building on the framework of He and Forbes et al. (2021, Geophysical Research Letters). Meteor radar observations are used to characterize Q2DW variability, and a multivariate phase-based representation of the QBO and seasonal cycle is employed to quantify their joint influence. A statistical coupling analysis is applied to identify dominant modes linking QBO variability to Q2DW activity and to reconstruct the Q2DW field from the derived drivers. The results show that inclusion of the QBO significantly improves the representation of Q2DW variability, demonstrating a clear QBO modulation.