Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0338.1 |
Lee Mixing and Nocturnal Structure over Gentle Topography | |
Mahrt, L. | |
2017-06-01 | |
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:6 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study analyzes measurements from a network of sonic anemometers over gentle topography to investigate the possibility of nocturnal lee-generated turbulence. Although the valley side slopes are less than 68 and extend only about 12 m above the floor of the valley, the turbulence can be enhanced in the lee of one of the slopes. Significant lee turbulence develops downwind from an abrupt slope transition between a mini-plateau and the modest valley side slope. Lee-generated turbulence is not observed on the opposite slope, where the slope magnitude gradually decreases with height. With intermediate 1-m wind speeds of roughly 2-4 m s(-1), the cold pool is advected up the downwind slope. This downwind displacement of the cold pool and warming by lee-generated turbulence, when it occurs, leads to significant horizontal asymmetry of the temperature across the valley. For stronger winds, the cold pool is eliminated by mixing. For weak winds, a more traditional cold pool forms centered on the valley floor with limited or no lee-generated turbulence. While the impact of the gentle topography is modest compared to more dramatic terrain, less organized gentle topography covers a large fraction of Earth's surface. However, with gentle topography, various relationships show substantial scatter, and the generalization of results from an individual network is probably not possible. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403101200017 |
WOS关键词 | COMPLEX TERRAIN ; FLOW ; POOLS ; WIND |
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/29427 |
专题 | 地球科学 |
作者单位 | NorthWest Res Associates, Corvallis, OR 97333 USA |
推荐引用方式 GB/T 7714 | Mahrt, L.. Lee Mixing and Nocturnal Structure over Gentle Topography[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(6). |
APA | Mahrt, L..(2017).Lee Mixing and Nocturnal Structure over Gentle Topography.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(6). |
MLA | Mahrt, L.."Lee Mixing and Nocturnal Structure over Gentle Topography".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.6(2017). |
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