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DOI | 10.1002/2017JD027590 |
A Comparison of Small- and Medium-Scale Gravity Wave Interactions in the Linear and Nonlinear Limits | |
Heale, C. J.1,2; Snively, J. B.1,2 | |
2018-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:5页码:2454-2474 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A 2-D numerical model is used to compare interactions between small-scale (SS) (25km horizontal wavelength, 10min period) and medium-scale (MS, 250km horizontal wavelength, 90min period) gravity waves (GWs) in the Mesosphere and Lower Thermosphere within three different limits. First, the MS wave is specified as a static, horizontally homogeneous ambient atmospheric feature; second, a linear interaction is investigated between excited, time-dependent SS and MS waves, and third, a fully nonlinear interaction at finite amplitudes is considered. It is found that the finite-amplitude wave interactions can cause SS wave breaking aligned with the phase fronts of the MS waves, which induces a permanent mean flow and shear that is periodic in altitude. This impedes SS wave propagation into in the upper thermosphere and dissipation by molecular diffusion, when compared to linear amplitude simulations. Linear cases also omit self-acceleration-related instabilities of the SS wave and secondary wave generation, which modulate the MS wavefield. Neither the linear or nonlinear cases resemble the static approximation, which, by reducing a dynamic wave interaction to a static representation that is vertically varying, produces variable momentum flux distributions that depend strongly upon the amplitude and phase of the larger-scale wave. This is an approximation made by GW parameterization schemes, and results suggest that including time-dependent effects and feedback mechanisms for interactions between resolved and parameterized waves will be an important area for future investigations especially as general circulation models begin to resolve MS GWs explicitly. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428437100005 |
WOS关键词 | DOPPLER-SPREAD PARAMETERIZATION ; MIDDLE-ATMOSPHERE ; MOMENTUM FLUX ; SPECTRAL PARAMETERIZATION ; GENERAL-CIRCULATION ; LOWER THERMOSPHERE ; SELF-ACCELERATION ; MESOPAUSE REGION ; CRITICAL LAYER ; NEW-ZEALAND |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32655 |
专题 | 气候变化 |
作者单位 | 1.Embry Riddle Aeronaut Univ, CSAR, Daytona Beach, FL 32114 USA; 2.Embry Riddle Aeronaut Univ, Dept Phys Sci, Daytona Beach, FL 32114 USA |
推荐引用方式 GB/T 7714 | Heale, C. J.,Snively, J. B.. A Comparison of Small- and Medium-Scale Gravity Wave Interactions in the Linear and Nonlinear Limits[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(5):2454-2474. |
APA | Heale, C. J.,&Snively, J. B..(2018).A Comparison of Small- and Medium-Scale Gravity Wave Interactions in the Linear and Nonlinear Limits.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(5),2454-2474. |
MLA | Heale, C. J.,et al."A Comparison of Small- and Medium-Scale Gravity Wave Interactions in the Linear and Nonlinear Limits".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.5(2018):2454-2474. |
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