A new methodology for measuring traveling quasi-5-day oscillations during sudden stratospheric warming events based on satellite observations

Abstract. Enhancements of stationary planetary waves (SPWs) and traveling (TPWs) are commonly observed in the middle atmosphere during sudden stratospheric warming (SSW) events. Based on least squares fitting method (Wu et al., 1995), numerous studies have used satellite measurements to investigate characteristics TPWs SSWs, but they ignored effect SPWs. However, a rapid large change SPWs SSWs may lead significant disturbances amplitude derived TPWs. In this study, we present new methodology for obtaining amplitudes wave numbers quasi-5-day oscillations (Q5DOs) major SSWs. Our is developed by inhibiting We demonstrate effectiveness using both synthetic data observations. The results simulations indicate that can suppress aliasing from capture real variations geopotential height measured Aura 2004 2021, Q5DOs eight midwinter reevaluated method. differences fitted between usually over 100 m SSW onsets. analysis indicates previously reported might be contaminated SPWs, leading overestimation underestimation Q5DOs.