Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD030513 |
Toward Large-Eddy Simulations of Dust Devils of Observed Intensity: Effects of Grid Spacing, Background Wind, and Surface Heterogeneities | |
Giersch, S.1; Brast, M.1,2; Hoffmann, F.1,3,4; Raasch, S.1 | |
2019-07-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:14页码:7697-7718 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA |
英文摘要 | Dust devils are convective vortices with a vertical axis of rotation made visible by lifted soil particles. Currently, there is great uncertainty about the extent to which dust devils contribute to the atmospheric aerosol input and thereby influence Earth's radiation budget. Past efforts to quantify the aerosol transport and study their formation, maintenance, and statistics using large-eddy simulation (LES) have been of limited success. Therefore, some important features of dust devil-like vortices simulated with LES still do not compare well with those of observed ones. One major difference is the simulated value of the core pressure drop, which is almost 1 order of magnitude smaller compared to the observed range of 250 to 450Pa. However, most of the existing numerical simulations are based on highly idealized setups and coarse grid spacings. In this study, we investigate the effects of various factors on the simulated vortex strength with high-resolution LES. For the fist time, we are able to reproduce observed core pressures by using a high spatial resolution of 2m, a model setup with moderate background wind and a spatially heterogeneous surface heat flux. It is found that vortices mainly appear at the lines of horizontal flow convergence above the centers of the strongly heated patches, which is in contrast to some older observations in which vortices seemed to be created along the patch edges. |
英文关键词 | large-eddy simulation dust devils convective boundary layer PALM |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000481444200015 |
WOS关键词 | NUMERICAL-SIMULATION ; CONVECTIVE PLUMES ; TERRESTRIAL ; VORTICES ; SCALE |
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/185229 |
专题 | 气候变化 |
作者单位 | 1.Leibniz Univ Hannover, Inst Meteorol & Climatol, Hannover, Germany; 2.METEK Meteorol Messtech GmbH, Elmshorn, Germany; 3.Univ Colorado, CIRES, Boulder, CO 80309 USA; 4.NOAA, ESRL, Chem Sci Div, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Giersch, S.,Brast, M.,Hoffmann, F.,et al. Toward Large-Eddy Simulations of Dust Devils of Observed Intensity: Effects of Grid Spacing, Background Wind, and Surface Heterogeneities[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(14):7697-7718. |
APA | Giersch, S.,Brast, M.,Hoffmann, F.,&Raasch, S..(2019).Toward Large-Eddy Simulations of Dust Devils of Observed Intensity: Effects of Grid Spacing, Background Wind, and Surface Heterogeneities.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(14),7697-7718. |
MLA | Giersch, S.,et al."Toward Large-Eddy Simulations of Dust Devils of Observed Intensity: Effects of Grid Spacing, Background Wind, and Surface Heterogeneities".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.14(2019):7697-7718. |
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