Mechanisms of formation of a Mesospheric Inversion Layer and Subsequent Elevated Stratopause Associated with the 2019 Stratospheric Sudden Warming

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• Haruka Okui, University of Tokyo
• Monday 17 October 2022, 13:00-14:00
• MR5, CMS.

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Following several prolonged stratospheric sudden warmings (SSWs), disappearance of the lowered stratopause and its reformation at a higher altitude have been observed. This phenomenon is known as an elevated stratopause (ES). Despite its importance in the dynamics and material transport in the middle atmosphere, the mechanism of ES formation is still not fully understood, especially regarding the relative roles of atmospheric waves. To elucidate this mechanism, we performed a hindcast of the 2019 SSW event using a gravity-wave permitting high-top general circulation model. Three-dimensional and quantitative analysis revealed crucial roles of the interplay between gravity waves and Rossby waves in the mechanisms of the series of dynamical phenomena observed before/after the SSW , including an ES.

This talk is part of the Quantitative Climate and Environmental Science Seminars series.

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