气候变化领域集成服务门户(CCPortal): 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

CCPortal

DOI	10.1029/2020JD032866
	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
	Li Z.; Chu X.; Harvey V.L.; Jandreau J.; Lu X.; Yu Z.; Zhao J.; Fong W.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	This work presents the first lidar observations of a Quasi-Biennial Oscillation (QBO) in the interannual variations of stratospheric gravity wave potential energy density (Epm in 30–50 km) at McMurdo (77.84°S, 166.67°E), Antarctica. This paper also reports the first identification of QBO signals in the distance between McMurdo and the polar vortex edge. Midwinter stratospheric gravity wave activity is stronger 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 Epm winter maxima being ~43% higher during QBO easterly than westerly. The June polar vortex edge at 45 km altitude moves equatorward/poleward during QBO easterly/westerly phases with ~8° latitude differences (39.7°S vs. 47.7°S) as revealed in 21 years of MERRA-2 data (1999–2019). We hypothesize that an equatorward shifted polar vortex corresponds to less critical level filtering of gravity waves and thus higher Epm at McMurdo. The critical level filtering is characterized by wind rotation angle (WRA), and we find a linear correlation between the WRA and Epm interannual variations. The results suggest that the QBO is likely controlling the interannual variations of the Epm winter maxima over McMurdo via the critical level filtering. This observationally based study lays the groundwork for a rigorous numerical study that will provide robust statistics to better understand the mechanisms that link the tropical QBO to extratropical waves. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Antarctica; gravity wave potential energy density; interannual variations; lidar observations; polar vortex; Quasi-Biennial Oscillation
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185850
作者单位	School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Cooperative Institute of Research in Environmental Sciences and Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, United States; Laboratory for Atmosphere and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Physics and Astronomy, Clemson University, Clemson, SC, United States; Harbin Institute of Technology (Shenzhen), Shenzhen, China
推荐引用方式 GB/T 7714	Li Z.,Chu X.,Harvey V.L.,et al. 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[J],2020,125(16).
APA	Li Z..,Chu X..,Harvey V.L..,Jandreau J..,Lu X..,...&Fong W..(2020).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.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Li Z.,et al."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".Journal of Geophysical Research: Atmospheres 125.16(2020).