DOI: 10.1002/2017JD027440
Scopus记录号: 2-s2.0-85040721521
论文题名: Gravity Wave Dynamics in a Mesospheric Inversion Layer: 1. Reflection, Trapping, and Instability Dynamics
作者: Fritts D.C. ; Laughman B. ; Wang L. ; Lund T.S. ; Collins R.L.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 626
结束页码: 648
语种: 英语
英文关键词: gravity wave dynamics
; gravity wave instabilities
; gravity wave reflection and transmission
; mesospheric inversion layers
Scopus关键词: gravity wave
; inversion layer
; mesosphere
; numerical model
; tropopause
; turbulence
; velocity structure
; wave propagation
英文摘要: An anelastic numerical model is employed to explore the dynamics of gravity waves (GWs) encountering a mesosphere inversion layer (MIL) having a moderate static stability enhancement and a layer of weaker static stability above. Instabilities occur within the MIL when the GW amplitude approaches that required for GW breaking due to compression of the vertical wavelength accompanying the increasing static stability. Thus, MILs can cause large-amplitude GWs to yield instabilities and turbulence below the altitude where they would otherwise arise. Smaller-amplitude GWs encountering a MIL do not lead to instability and turbulence but do exhibit partial reflection and transmission, and the transmission is a smaller fraction of the incident GW when instabilities and turbulence arise within the MIL. Additionally, greater GW transmission occurs for weaker MILs and for GWs having larger vertical wavelengths relative to the MIL depth and for lower GW intrinsic frequencies. These results imply similar dynamics for inversions due to other sources, including the tropopause inversion layer, the high stability capping the polar summer mesopause, and lower frequency GWs or tides having sufficient amplitudes to yield significant variations in stability at large and small vertical scales. MILs also imply much stronger reflections and less coherent GW propagation in environments having significant fine structure in the stability and velocity fields than in environments that are smoothly varying. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114678
Appears in Collections: 气候减缓与适应
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作者单位: GATS Inc., Boulder, CO, United States; Colorado Research Associates Division, NorthWest Research Associates, Boulder, CO, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Fritts D.C.,Laughman B.,Wang L.,et al. Gravity Wave Dynamics in a Mesospheric Inversion Layer: 1. Reflection, Trapping, and Instability Dynamics[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)