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DOI | 10.1175/JAS-D-16-0077.1 |
Dynamical and Physical Processes Associated with Orographic Precipitation in a Conditionally Unstable Uniform Flow: Variation in Basic Wind Speed | |
Sever, Gokhan1,2; Lin, Yuh-Lang1,3 | |
2017-02-01 | |
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:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A series of systematic two- and three-dimensional (2D and 3D, respectively) idealized numerical experiments were conducted to investigate the combined effects of dynamical and physical processes on orographic precipitation with varying incoming basic-flow speed U in a conditionally unstable uniform flow. In addition to the three moist flow regimes found in Chu and Lin at lower wind speeds, a new flow regime, regime IV, is found for higher wind speeds (U > 36 m s(-1)) and is characterized by gravity waves and heavy precipitation and lack of upper-level wave breaking and turbulence over the lee slope. The transition from regime III to regime IV at 36 m s(-1) is explained by the transition from upward-propagating gravity waves to evanescent flow, which can be predicted with a modified mountain wave theory. Although the basic features are captured well in low grid resolution (Delta x = 1 km), high-resolution (Delta x = 100 m) 2D and 3D simulations are required to resolve precipitation distribution and intensity at higher basic winds (U > 30 m s(-1)). Based on 3D simulations, gravity wave-induced severe downslope winds and turbulent mixing within hydraulic jump reduce orographic precipitation in regime III. A preliminary budget analysis indicated that, in regime IV, orographic precipitation further increases as a result of enhanced rain processes when the blocking effect of wave breaking vanishes. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394341100009 |
WOS关键词 | MOUNTAIN RIDGE ; SIMULATION ; MODEL |
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/29573 |
专题 | 地球科学 |
作者单位 | 1.North Carolina Agr & Tech State Univ, Dept Energy & Environm Syst, Greensboro, NC 27401 USA; 2.Argonne Natl Lab, Div Environm Sci, 9700 S Cass Ave, Argonne, IL 60439 USA; 3.North Carolina Agr & Tech State Univ, Dept Phys, Greensboro, NC 27401 USA |
推荐引用方式 GB/T 7714 | Sever, Gokhan,Lin, Yuh-Lang. Dynamical and Physical Processes Associated with Orographic Precipitation in a Conditionally Unstable Uniform Flow: Variation in Basic Wind Speed[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(2). |
APA | Sever, Gokhan,&Lin, Yuh-Lang.(2017).Dynamical and Physical Processes Associated with Orographic Precipitation in a Conditionally Unstable Uniform Flow: Variation in Basic Wind Speed.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(2). |
MLA | Sever, Gokhan,et al."Dynamical and Physical Processes Associated with Orographic Precipitation in a Conditionally Unstable Uniform Flow: Variation in Basic Wind Speed".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.2(2017). |
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