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First Lidar Observations of Quasi‐Biennial Oscillation‐Induced Interannual Variations of Gravity Wave Potential Energy Density at McMurdo via a Modulation of the Antarctic Polar Vortex
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2020
Source: Journal of Geophysical Research: Atmospheres, 125(16)
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Journal Title:Journal of Geophysical Research: Atmospheres
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Description:This work presents the first lidar observations of a Quasi ‐Biennial Oscillation (QBO) in the interannual variations of stratospheric gravity wave potential energy density ( Epmin 30 –50 km) at McMurdo (77.84°S, 166.67°E), Antarctica. This paper also reports the first identi fication of QBO signals in the distance between McMurdo and the polar vortex edge. Midwinter stratospheric gravity wave activity isstronger during the QBO easterly phase when the June polar vortex expands and the polar night jet shifts equatorward. During the QBO westerly phase, gravity wave activity is weaker when the polar vortex contracts and the polar night jet moves poleward. Nine years of lidar data (2011 –2019) exhibit the mean E pm
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Source:Journal of Geophysical Research: Atmospheres, 125(16)
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ISSN:2169-897X;2169-8996;
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