Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0115.1 |
Response of Orographic Precipitation to Subsaturated Low-Level Layers | |
Fu, Shizuo1; Rotunno, Richard2; Xue, Huiwen1 | |
2019-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:12页码:3753-3771 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | In orographic precipitation events, there are times when subsaturated low-level layers are observed to be below saturated, nearly moist-neutral, upper-level layers. By performing a series of idealized two-dimensional simulations, this study investigates the response of orographic precipitation to subsaturated low-level layers. When the nondimensional parameter N(2)z(t)/U, where N-2 and z(t) are, respectively, the dry Brunt-Vaisala frequency and depth of the subsaturated low-level layer, and U the cross-mountain wind speed, exceeds a critical value, the decelerated region on the upwind side of the mountain moves upwind, resulting in weak surface precipitation near the mountain peak. The critical value determined from the simulations is close to that derived from linear theory. When N(2)z(t)/U is less than the critical value, increasing z(t) has two competing effects: 1) the vapor-transport effect, meaning that increasing z(t) decreases the amount of vapor transported to the mountain, and hence tends to decrease surface precipitation; and 2) the updraft-width effect, meaning that increasing z(t) enhances flow blocking, producing a wider updraft over the upwind slope, and hence tends to increase surface precipitation. When the vapor-transport effect dominates, surface precipitation decreases with z(t). When the updraft-width effect dominates, surface precipitation increases with z(t). Increasing the maximum mountain height h(m) or U generally increases surface precipitation. However, for certain combinations of h(m) and U, the simulations produce lee waves, which substantially reduce surface precipitation. Finally, the response of orographic precipitation in the simulations with both liquid-phase and ice-phase microphysics is similar to that in the simulations with only liquid-phase microphysics. |
英文关键词 | Clouds Orographic effects Precipitation Cloud resolving models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000498579200001 |
WOS关键词 | MOIST DYNAMICS ; NEUTRAL FLOW ; SENSITIVITY ; MOUNTAIN ; MICROPHYSICS ; SIMULATIONS ; NORTHERN ; RAINFALL ; TAIWAN ; 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/226005 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Beijing, Peoples R China; 2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Fu, Shizuo,Rotunno, Richard,Xue, Huiwen. Response of Orographic Precipitation to Subsaturated Low-Level Layers[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(12):3753-3771. |
APA | Fu, Shizuo,Rotunno, Richard,&Xue, Huiwen.(2019).Response of Orographic Precipitation to Subsaturated Low-Level Layers.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(12),3753-3771. |
MLA | Fu, Shizuo,et al."Response of Orographic Precipitation to Subsaturated Low-Level Layers".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.12(2019):3753-3771. |
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