气候变化领域集成服务门户(CCPortal): Quasi-4-Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2

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DOI	10.1029/2021JD034855
	Quasi-4-Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2
	Yamazaki Y.; Matthias V.; Miyoshi Y.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:13
英文摘要	This paper describes global characteristics of the westward-propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi-4-day wave (Q4DW), which is considered to be a manifestation of the (2,1) Rossby normal mode. A climatology of the Q4DW is derived from geopotential height measurements by the Aura Microwave Limb Sounder during August 2004–December 2020. In the mesosphere and lower thermosphere (MLT), amplitude maxima occur at mid latitudes in May and August in the Northern Hemisphere, and in February and November in the Southern Hemisphere. With the amplitude exceeding 300 m, the Q4DW sometimes becomes the dominant mode of traveling planetary waves in the MLT. The seasonal variation is largely determined by the zonal mean state. As predicted by previous modeling work, the amplitude grows rapidly with height on the equatorward side of the critical layer, where the zonal mean flow is weakly eastward relative to the wave. The wave growth can be particularly large when there is a region of unstable mean flow across the boundary of the critical layer. This condition is met not only during the seasonal amplification of the Q4DW but also during some Arctic sudden stratospheric warming events, leading to an unseasonal enhancement. © 2021. The Authors.
英文关键词	Aura Microwave Limb Sounder; lower thermosphere; mesosphere; quasi-4-day wave; Rossby wave; sudden stratospheric warming
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/237168
作者单位	GFZ German Research Centre for Geosciences, Potsdam, Germany; Deutsches Zentrum für Luft- und Raumfahrt, Institut für Solar-Terrestrische Physik, Neustrelitz, Germany; Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan
推荐引用方式 GB/T 7714	Yamazaki Y.,Matthias V.,Miyoshi Y.. Quasi-4-Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2[J],2021,126(13).
APA	Yamazaki Y.,Matthias V.,&Miyoshi Y..(2021).Quasi-4-Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Yamazaki Y.,et al."Quasi-4-Day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2".Journal of Geophysical Research: Atmospheres 126.13(2021).