气候变化领域集成服务门户(CCPortal): Self-Acceleration and Instability of Gravity Wave Packets: 2. Two-Dimensional Packet Propagation, Instability Dynamics, and Transient Flow Responses

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DOI	10.1029/2019JD030691
	Self-Acceleration and Instability of Gravity Wave Packets: 2. Two-Dimensional Packet Propagation, Instability Dynamics, and Transient Flow Responses
	Dong W.; Fritts D.C.; Lund T.S.; Wieland S.A.; Zhang S.
发表日期	2020
ISSN	2169897X
卷号	125 期号:3
英文摘要	Results of two-dimensional and narrow three-dimensional (2-D and 2.5-D) simulations of a gravity wave (GW) packet localized in altitude and along its propagation direction employing a new, versatile compressible model are described. The simulations explore self-acceleration and instability dynamics in an idealized atmosphere at rest under mean solar conditions in a domain extending to an altitude of 260 km and 1,800 km horizontally without artificial dissipation. High resolution in the central 2.5-D domain enables the description of 3-D instability dynamics accounting for breaking, dissipation, and momentum deposition within the GW packet. 2-D results describe responses to localized self-acceleration effects, including generation of secondary GWs (SGWs) at larger scales able to propagate to much higher altitudes. 2.5-D results exhibit instability forms consistent with previous 3-D simulations of instability dynamics and cause SGW generation and propagation at smaller spatial scales to weaken significantly compared to the 2-D results. SGW responses at larger scales are driven primarily by GW/mean flow interactions arising at early stages of the self-acceleration dynamics prior to strong GW instabilities and dissipation. As a result, they exhibit similar responses in both the 2-D and 2.5-D simulations and readily propagate to high altitudes at large distances from the initial GW packet. A companion paper examines these dynamics for an initial GW packet localized in three dimensions and evolving in a representative 3-D tidal wind field. © 2019. The Authors.
英文关键词	gravity wave instabilities; gravity wave self-acceleration; induced mean flows; secondary gravity waves; transient body forcing
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/186207
作者单位	GATS, Boulder, CO, United States; Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States; School of Electronic Information, Wuhan University, Wuhan, China
推荐引用方式 GB/T 7714	Dong W.,Fritts D.C.,Lund T.S.,et al. Self-Acceleration and Instability of Gravity Wave Packets: 2. Two-Dimensional Packet Propagation, Instability Dynamics, and Transient Flow Responses[J],2020,125(3).
APA	Dong W.,Fritts D.C.,Lund T.S.,Wieland S.A.,&Zhang S..(2020).Self-Acceleration and Instability of Gravity Wave Packets: 2. Two-Dimensional Packet Propagation, Instability Dynamics, and Transient Flow Responses.Journal of Geophysical Research: Atmospheres,125(3).
MLA	Dong W.,et al."Self-Acceleration and Instability of Gravity Wave Packets: 2. Two-Dimensional Packet Propagation, Instability Dynamics, and Transient Flow Responses".Journal of Geophysical Research: Atmospheres 125.3(2020).