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DOI | 10.1175/JAS-D-19-0108.1 |
Detailed Dual-Doppler Structure of Kelvin-Helmholtz Waves from an Airborne Profiling Radar over Complex Terrain. Part I: Dynamic Structure | |
Grasmick, Coltin; Geerts, Bart | |
2020-05-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:5页码:1761-1782 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Kelvin-Helmholtz (KH) waves are remarkably common in deep stratiform precipitation systems associated with frontal disturbances, at least in the vicinity of complex terrain, as is evident from transects of vertical velocity and 2D circulation, obtained from a 3-mm airborne Doppler radar, the Wyoming Cloud Radar. The high range resolution of this radar (similar to 40 m) allows detection and depiction of KH waves in fine detail. These waves are observed in a variety of wavelengths, depths, amplitudes, and turbulence intensities. Proximity rawinsonde data confirm that they are triggered in layers where the Richardson number is very small. Complex terrain may locally enhance wind shear, leading to KH instability. In some KH waves, the flow remains mostly laminar, while in other cases it breaks down into turbulence. KH waves are frequently locked to the terrain, and occur at various heights, including within the free troposphere, at the boundary layer top, and close to the surface. They are observed not only upwind of terrain barriers, as has been documented before, but also in the wake of steep terrain, where the waves can be highly turbulent. Vertical-plane dual-Doppler analyses of KH waves reveal the mixing of layers of differential momentum across the high-shear zone. Doppler radar data are used to explore the dynamics of KH waves, including the response of thermodynamic and kinematic variables above, below, and within the instability layer. |
英文关键词 | Kelvin-Helmholtz instabilities Shear structure flows Waves atmospheric Large eddy simulations |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535703800013 |
WOS关键词 | FINESCALE VERTICAL STRUCTURE ; LARGE-EDDY SIMULATION ; CLEAR-AIR TURBULENCE ; BOUNDARY-LAYER ; OROGRAPHIC PRECIPITATION ; UPPER TROPOSPHERE ; MOUNTAIN WAVES ; COLD-FRONT ; INSTABILITY ; CLOUDS |
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/280342 |
专题 | 地球科学 |
作者单位 | Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA |
推荐引用方式 GB/T 7714 | Grasmick, Coltin,Geerts, Bart. Detailed Dual-Doppler Structure of Kelvin-Helmholtz Waves from an Airborne Profiling Radar over Complex Terrain. Part I: Dynamic Structure[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(5):1761-1782. |
APA | Grasmick, Coltin,&Geerts, Bart.(2020).Detailed Dual-Doppler Structure of Kelvin-Helmholtz Waves from an Airborne Profiling Radar over Complex Terrain. Part I: Dynamic Structure.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(5),1761-1782. |
MLA | Grasmick, Coltin,et al."Detailed Dual-Doppler Structure of Kelvin-Helmholtz Waves from an Airborne Profiling Radar over Complex Terrain. Part I: Dynamic Structure".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.5(2020):1761-1782. |
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