SA005-0009
Antarctic Quasi-10 Day Wave Activity Prior to the 2019 Southern sudden stratospheric warming

Tuesday, 8 December 2020
Poster
Jack Wang1, Scott E Palo2, John Marino3 and Jeffrey M M Forbes3, (1)University of Colorado Boulder, Boulder, CO, United States, (2)University of Colorado at Boulder, Smead Aerospace Engineering Sciences, Boulder, CO, United States, (3)University of Colorado at Boulder, Boulder, CO, United States
Abstract:
An unusual sudden stratospheric warming (SSW) occurred in the Southern hemisphere in September 2019. Satellite observations show a burst of eastward-propagating quasi-10 day planetary wave with zonal wavenumber one. The planetary wave activity maximizes in the Antarctic middle atmosphere approximately 30 days before the SSW onset. The quasi-10 day planetary wave abruptly dissipates after the onset of the SSW. Observations from MLS, SABER, and TIDI provide a unique opportunity to study the global structure and evolution of the quasi-10 day waves with both neutral wind and temperature measurements under this unusual atmospheric condition. These space-based measurements are combined with meteor radar wind measurements from Antarctica, providing a comprehensive view of the quasi-10 day wave activity during this SSW. We will present a preliminary analysis of the ionospheric response to these wave perturbations.
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