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DOI | 10.1029/2020JD032492 |
Improvement of Atmospheric Objective Analysis Over Sloping Terrain and Its Impact on Shallow-Cumulus Clouds in Large-Eddy Simulations | |
Tang, Shuaiqi1; Xie, Shaocheng1; Zhang, Minghua2; Endo, Satoshi3 | |
2020-07-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Surface topography strongly impacts the regional atmospheric circulation dynamically and thermodynamically. Over the Great Plains in the United States, the gently tilted slope is an important factor that impacts clouds, convection, and regional circulations. This study enhances an atmospheric constrained variational analysis by using a terrain-following sigma vertical coordinate and applies to the data collected at the Southern Great Plain (SGP) site of the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) program. Sensitivity studies are performed to examine the impact of the terrain effects on the derived large-scale atmospheric forcing fields and the simulated shallow-cumulus clouds in large-eddy simulation (LES) driven by the forcing. We found that the terrain impacts on the large-scale forcing fields are mainly at lower levels and are strongly controlled by up/downslope winds. The response of the derived forcing to the slope of the terrain is monotonic, but the response of the simulated shallow-cumulus clouds is more complex and depends on several factors. Overall, the terrain impact is small over SGP due to the small slope angle. However, the flat-surface assumption may cause larger biases in the large-scale forcing fields at locations with steeper terrain. The new sigma coordinate algorithm, with its consideration of surface slope, should be more suitable to derive large-scale objective analysis over regions with steep terrain for application to force single-column models, cloud resolving models, and LES models. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000551484700032 |
WOS关键词 | SOUTHERN GREAT-PLAINS ; CONVECTION INITIATION ; NOCTURNAL CONVECTION ; DRYING PROFILES ; PRECIPITATION ; CLIMATOLOGY ; HEAT |
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/289513 |
专题 | 气候变化 |
作者单位 | 1.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA; 2.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY 11794 USA; 3.Brookhaven Natl Lab, Upton, NY 11973 USA |
推荐引用方式 GB/T 7714 | Tang, Shuaiqi,Xie, Shaocheng,Zhang, Minghua,et al. Improvement of Atmospheric Objective Analysis Over Sloping Terrain and Its Impact on Shallow-Cumulus Clouds in Large-Eddy Simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(13). |
APA | Tang, Shuaiqi,Xie, Shaocheng,Zhang, Minghua,&Endo, Satoshi.(2020).Improvement of Atmospheric Objective Analysis Over Sloping Terrain and Its Impact on Shallow-Cumulus Clouds in Large-Eddy Simulations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(13). |
MLA | Tang, Shuaiqi,et al."Improvement of Atmospheric Objective Analysis Over Sloping Terrain and Its Impact on Shallow-Cumulus Clouds in Large-Eddy Simulations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.13(2020). |
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