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DOI | 10.1175/JAS-D-17-0106.1 |
Role of Surface Friction on Shallow Nonprecipitating Convection | |
Park, Seung-Bu1,2; Boing, Steven3; Gentine, Pierre4,5 | |
2018 | |
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:1页码:163-178 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; South Korea; England |
英文摘要 | The role of surface friction on shallow nonprecipitating convection is investigated using a series of large-eddy simulations with varying surface friction velocity and with a cloud identification algorithm. As surface friction intensifies, convective rolls dominate over convective cells and secondary overturning circulation becomes stronger in the subcloud layer, thus transporting more moisture upward and more heat downward between the subcloud and cloud layers. Identifying individual clouds, using the identification algorithm based on a three-dimensional topological analysis, reveals that intensified surface friction increases the number of clouds and the degree of tilting in the downstream direction. Highly intensified surface friction increases wind shear across the cloud base and induces cloud tilting, which leads to a vertically parabolic profile of liquid water mixing ratio instead of the classical two-layer structure (conditionally unstable and trade inversion layers). Furthermore, cloud tilting induces more cloud cover andmore cloud mass fluxmuch above the cloud base (e.g., 0.8 < z < 1.2 km), but less cloud cover and less cloud mass flux in the upper cloud layer (e.g., z <1.2 km) because of increased lateral entrainment rate. Similarly, profiles of directly measured entrainment and detrainment rates show that detrainment in the lower cloud layer becomes smaller with stronger surface friction. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425750200009 |
WOS关键词 | LARGE-EDDY SIMULATIONS ; ATMOSPHERIC BOUNDARY-LAYER ; CUMULUS CONVECTION ; MOMENTUM TRANSPORT ; TRACKING ALGORITHM ; SUBSIDING SHELLS ; MIXED-LAYER ; MODEL ; ENTRAINMENT ; DRIVEN |
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/29732 |
专题 | 地球科学 |
作者单位 | 1.Columbia Univ, Dept Earth & Environm Engn, New York, NY 10027 USA; 2.Pusan Natl Univ, Inst Basic Sci Ctr Climate Phys, Busan, South Korea; 3.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England; 4.Columbia Univ, Dept Earth & Environm Engn, New York, NY USA; 5.Columbia Univ, Earth Inst, New York, NY USA |
推荐引用方式 GB/T 7714 | Park, Seung-Bu,Boing, Steven,Gentine, Pierre. Role of Surface Friction on Shallow Nonprecipitating Convection[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(1):163-178. |
APA | Park, Seung-Bu,Boing, Steven,&Gentine, Pierre.(2018).Role of Surface Friction on Shallow Nonprecipitating Convection.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(1),163-178. |
MLA | Park, Seung-Bu,et al."Role of Surface Friction on Shallow Nonprecipitating Convection".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.1(2018):163-178. |
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