DOI: 10.1002/2017JD027442
Scopus记录号: 2-s2.0-85040711983
论文题名: Gravity Wave Dynamics in a Mesospheric Inversion Layer: 2. Instabilities, Turbulence, Fluxes, and Mixing
作者: Fritts D.C. ; Wang L. ; Laughman B. ; 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: 649
结束页码: 670
语种: 英语
英文关键词: gravity wave heat and momentum fluxes
; gravity wave instability dynamics
; gravity waves
; mesospheric inversion layers
; turbulence and mixing
Scopus关键词: atmospheric dynamics
; energy dissipation
; flux measurement
; gravity wave
; heat flux
; instability
; inversion layer
; mesosphere
; mixing
; momentum
; numerical model
; shear
; turbulence
; wind forcing
英文摘要: A companion paper by Fritts, Laughman, et al. (2017) employed an anelastic numerical model to explore the dynamics of gravity waves (GWs) encountering a mesospheric inversion layer (MIL) having a moderate static stability enhancement and a layer of weaker static stability above. That study revealed that MIL responses, including GW transmission, reflection, and instabilities, are sensitive functions of GW parameters. This paper expands on two of the Fritts, Laughman, et al. (2017) simulations to examine GW instability dynamics and turbulence in the MIL; forcing of the mean wind and stability environments by GW, instability, and turbulence fluxes; and associated heat and momentum transports. These direct numerical simulations resolve turbulence inertial-range scales and yield the following results: GW breaking and turbulence in the MIL occur below where they would otherwise, due to enhancements of GW amplitudes and shears in the MIL. 2-D GW and instability heat and momentum fluxes are ~20–30 times larger than 3-D instability and turbulence fluxes. Mean fields are driven largely by 2-D GW and instability dynamics rather than 3-D instabilities and turbulence. 2-D and 3-D heat fluxes in regions of strong turbulence yield small departures from initial T(z) and N2(z) profiles, hence do not yield nearly adiabatic “mixed” layers. Our MIL results are consistent with the relation between the turbulent vertical velocity variance and energy dissipation rate proposed by Weinstock (1981) for the limited intervals evaluated. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114635
Appears in Collections: 气候减缓与适应
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作者单位: GATS Inc., Boulder Division, Boulder, CO, United States; Colorado Research Associates Division, NorthWest Research Associates, Boulder, CO, United States; Geophysical Institute, University of Alaska, Fairbanks, AK, United States
Recommended Citation:
Fritts D.C.,Wang L.,Laughman B.,et al. Gravity Wave Dynamics in a Mesospheric Inversion Layer: 2. Instabilities, Turbulence, Fluxes, and Mixing[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)