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DOI | 10.1175/JAS-D-16-0134.1 |
Generation of Gravity Waves by Singular Potential Vorticity Disturbances in Shear Flows | |
Kalashnik, Maxim V.1; Chkhetiani, Otto1,2 | |
2017 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Russia |
英文摘要 | The linear mechanism of generation of gravity waves by potential vorticity (PV) disturbances in flows with constant horizontal and vertical shears is studied. The case of the initial singular distribution of PV, in which the PV is localized in one coordinate and is periodic with respect to other coordinates, is considered. In a stratified rotating medium, such a distribution induces a vortex wave (continuous mode), the propagation of which is accompanied by the emission of gravity waves. To find the emission characteristics, a linearized system of dynamical equations is reduced to wave equations with sources that are proportional to the initial distributions of PV. The asymptotic solutions of the equations are constructed for small Rossby numbers (horizontal shear) and large Richardson numbers (vertical shear). When passing through the inertial levels symmetrically located with respect to a vortex source, the behavior of the solutions for wave amplitudes radically changes. Directly in the vicinity of the source, the solutions are of monotonic character, corresponding to a quasigeostrophic vortex wave. At long distances from the source, the solutions oscillate. The horizontal momentum flux and the Eliassen-Palm flux are estimated using asymptotic solutions. It is found that, within the indicated range of both Rossby and Richardson numbers, these fluxes are exponentially small: that is, the emission of waves is weak. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392419300017 |
WOS关键词 | NONSYMMETRIC PERTURBATIONS ; GEOSTROPHIC ADJUSTMENT ; LINEAR DYNAMICS ; PART I ; INSTABILITY ; VORTEX ; RADIATION ; JETS |
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/29726 |
专题 | 地球科学 |
作者单位 | 1.Russian Acad Sci, AM Obukhov Inst Atmospher Phys, Moscow, Russia; 2.Russian Acad Sci, Space Res Inst, Moscow, Russia |
推荐引用方式 GB/T 7714 | Kalashnik, Maxim V.,Chkhetiani, Otto. Generation of Gravity Waves by Singular Potential Vorticity Disturbances in Shear Flows[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(1). |
APA | Kalashnik, Maxim V.,&Chkhetiani, Otto.(2017).Generation of Gravity Waves by Singular Potential Vorticity Disturbances in Shear Flows.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(1). |
MLA | Kalashnik, Maxim V.,et al."Generation of Gravity Waves by Singular Potential Vorticity Disturbances in Shear Flows".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.1(2017). |
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