DOI: 10.1002/2016JD025621
论文题名: Horizontal propagation of large-amplitude mountain waves into the polar night jet
作者: Ehard B. ; Kaifler B. ; Dörnbrack A. ; Preusse P. ; Eckermann S.D. ; Bramberger M. ; Gisinger S. ; Kaifler N. ; Liley B. ; Wagner J. ; Rapp M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 1423
结束页码: 1436
语种: 英语
英文关键词: DEEPWAVE
; gravity waves
; lidar
; middle atmosphere
; mountain wave
; polar vortex
Scopus关键词: EOS
; gravity wave
; ground-based measurement
; jet stream
; lidar
; meridional circulation
; middle atmosphere
; mountain environment
; polar vortex
; stratosphere
; wave breaking
; wave propagation
; zonal wind
; New Zealand
英文摘要: We analyze a large-amplitude mountain wave event, which was observed by a ground-based lidar above New Zealand between 31 July and 1 August 2014. Besides the lidar observations, European Centre for Medium-Range Weather Forecasts (ECMWF) data, satellite observations, and ray tracing simulations are utilized in this study. It is found that the propagation of mountain waves into the middle atmosphere is influenced by two different processes at different stages of the event. At the beginning of the event, instabilities in a weak wind layer cause wave breaking in the lower stratosphere. During the course of the event the mountain waves propagate to higher altitudes and are refracted southward toward the polar night jet due to the strong meridional shear of the zonal wind. As the waves propagate out of the observational volume, the ground-based lidar observes no mountain waves in the mesosphere. Ray tracing simulations indicate that the mountain waves propagated to mesospheric altitudes south of New Zealand where the polar night jet advected the waves eastward. These results underline the importance of considering horizontal propagation of gravity waves, e.g., when analyzing locally confined observations of gravity waves. © 2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62695
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Germany; Institute of Energy and Climate Research (IEK-7: Stratosphere), Forschungszentrum Jülich, Jülich, Germany; Space Science Division, U.S. Naval Research Laboratory, Washington, DC, United States; National Institute of Water and Atmospheric Research, Lauder, New Zealand; Meteorological Institute Munich, Ludwig-Maximilians-Universität München, Munich, Germany
Recommended Citation:
Ehard B.,Kaifler B.,Dörnbrack A.,et al. Horizontal propagation of large-amplitude mountain waves into the polar night jet[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)