Radiosonde Observations of a Wintertime Meridional Convergence of Gravity Waves Around 60°S in the Lower Stratosphere

Tracy Moffat-Griffin, Steve R. Colwell, Corwin Wright, Neil Hindley, Nicholas Mitchell

Research output: Contribution to journalArticle

Abstract

Satellite observations show that there is a wintertime hotspot of gravity wave activity, located mainly over the ocean, around 60°S in the stratosphere. However, the sources of the gravity waves making up this hotspot are varied and complex and remain unclear. Here we use radiosonde observations from 11 Antarctic stations and selected small islands close to 60°S to examine the horizontal directional pseudo-momentum flux and energy density distributions of upward propagating gravity waves in the lower stratosphere. This paper shows, for the first time, that short vertical wavelength gravity waves in the lower stratosphere clearly propagate meridionally toward 60°S during the winter months. This result supports previous studies that show that this belt of gravity wave activity over the ocean is contributed to by wave sources outside 60°S.
Original languageEnglish
Article numbere2020GL089740
JournalGeophysical Research Letters
Volume47
Issue number20
Early online date22 Sep 2020
DOIs
Publication statusPublished - 20 Oct 2020

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