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DOI | 10.1175/JAS-D-17-0396.1 |
The Impact of Mountain Waves on an Idealized Baroclinically Unstable Large-Scale Flow | |
Menchaca, Maximo Q.; Durran, Dale R. | |
2018-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:9页码:3285-3302 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The feedback of mountain waves and low-level blocking on an idealized baroclinically unstable wave passing over an isolated ridge is examined through numerical simulation. Theoretical analysis implies that the volume-integrated perturbation momentum budget is dominated by mean-flow deceleration, the divergence of vertical fluxes of horizontal momentum, and the Coriolis force acting on the perturbation ageostrophic wind. These do indeed appear as the dominant balances in numerically computed budgets averaged over layers containing 1) wave breaking in the lower stratosphere, 2) flow blocking with wave breaking near the surface, and 3) a region of pronounced horizontally averaged mean-flow deceleration in the upper troposphere where there is no wave breaking. The local impact of wave breaking on the jet in the lower stratosphere is dramatic, with winds in the jet core reduced by almost 50% relative to the no-mountain case. Although it is the layer with the strongest average deceleration, the local patches of decelerated flow are weakest in the upper troposphere. The cross-mountain pressure drag over a 2-km-high ridge greatly exceeds the vertical momentum flux at mountain-top level because of low-level wave breaking, blocking, and lateral flow diversion. These pressure drags and the low-level momentum fluxes are significantly different from corresponding values computed for simulations with steady forcing matching the instantaneous conditions over the mountain in the evolving large-scale flow. |
英文关键词 | Baroclinic flows Gravity waves Mountain waves Orographic effects Wave breaking Subgrid-scale processes |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443109700003 |
WOS关键词 | MOMENTUM FLUX ; GRAVITY-WAVES ; DRAG ; ROTATION ; TOPOGRAPHY ; BREAKING ; RIDGES ; PYREX |
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/29795 |
专题 | 地球科学 |
作者单位 | Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Menchaca, Maximo Q.,Durran, Dale R.. The Impact of Mountain Waves on an Idealized Baroclinically Unstable Large-Scale Flow[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(9):3285-3302. |
APA | Menchaca, Maximo Q.,&Durran, Dale R..(2018).The Impact of Mountain Waves on an Idealized Baroclinically Unstable Large-Scale Flow.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(9),3285-3302. |
MLA | Menchaca, Maximo Q.,et al."The Impact of Mountain Waves on an Idealized Baroclinically Unstable Large-Scale Flow".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.9(2018):3285-3302. |
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