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DOI | 10.1175/JAS-D-19-0109.1 |
The Effect of Surface Drag Strength on Mesocyclone Intensification and Tornadogenesis in Idealized Supercell Simulations | |
Roberts, Brett1,2,4,5,6; Xue, Ming1,2; Dawson, Daniel T., II3 | |
2020-05-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:5页码:1699-1721 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A suite of six idealized supercell simulations is performed in which the surface drag coefficient C-d is varied over a range of values from 0 to 0.05 to represent a variety of water and land surfaces. The experiments employ a new technique for enforcing a three-force balance among the pressure gradient, Coriolis, and frictional forces so that the environmental wind profile can remain unchanged throughout the simulation. The initial low-level mesocyclone lowers toward the ground, intensifies, and produces a tornado in all experiments with C-d >= 0.002, with the intensification occurring earlier for larger C-d. In the experiment with C-d = 0, the low-level mesocyclone remains comparatively weak throughout the simulation and does not produce a tornado. Vertical cross sections through the simulated tornadoes reveal an axial downdraft that reaches the ground only in experiments with smaller C-d, as well as stronger corner flow in experiments with larger C-d. Material circuits are initialized enclosing the low-level mesocyclone in each experiment and traced backward in time. Circulation budgets for these circuits implicate surface drag acting in the inflow sector of the supercell as having generated important positive circulation, and its relative contribution increases with C-d. However, the circulation generation is similar in magnitude for the experiments with C-d = 0.02 and 0.05, and the tornado in the latter experiment is weaker. This suggests the possible existence of an optimal range of C-d values for promoting intense tornadoes within our experimental configuration. |
英文关键词 | Atmosphere-land interaction Tornadogenesis Trajectories Supercells Cloud resolving models Nonhydrostatic models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535703800010 |
WOS关键词 | PREDICTION SYSTEM ARPS ; NONHYDROSTATIC ATMOSPHERIC SIMULATION ; NUMERICAL WEATHER PREDICTION ; LARGE-EDDY SIMULATIONS ; VERTICAL VORTICITY ; SWIRL RATIO ; LOW-LEVEL ; PART I ; INTENSITY ; DYNAMICS |
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/280339 |
专题 | 地球科学 |
作者单位 | 1.Univ Oklahoma, Ctr Anal & Predict Storms, Norman, OK 73019 USA; 2.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; 3.Purdue Univ, W Lafayette, IN 47907 USA; 4.Cooperat Inst Mesoscale Meteorol Studies, Norman, OK USA; 5.NOAA, NWS, Storm Predict Ctr, Norman, OK USA; 6.NOAA, OAR, Natl Severe Storms Lab, Norman, OK USA |
推荐引用方式 GB/T 7714 | Roberts, Brett,Xue, Ming,Dawson, Daniel T., II. The Effect of Surface Drag Strength on Mesocyclone Intensification and Tornadogenesis in Idealized Supercell Simulations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(5):1699-1721. |
APA | Roberts, Brett,Xue, Ming,&Dawson, Daniel T., II.(2020).The Effect of Surface Drag Strength on Mesocyclone Intensification and Tornadogenesis in Idealized Supercell Simulations.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(5),1699-1721. |
MLA | Roberts, Brett,et al."The Effect of Surface Drag Strength on Mesocyclone Intensification and Tornadogenesis in Idealized Supercell Simulations".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.5(2020):1699-1721. |
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