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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Super High-Resolution Simulation of the 6 May 2012 Tsukuba Supercell Tornado: Near-Surface Structure and Its Evolution
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Super High-Resolution Simulation of the 6 May 2012 Tsukuba Supercell Tornado: Near-Surface Structure and Its Evolution

机译：2012年5月6日筑波超级单体龙卷风的超高分辨率模拟：近地表结构及其演化

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摘要

A super high-resolution simulation of the 6 May 2012 Tsukuba supercell tornado with a horizontal grid spacing of 10 m is conducted to investigate its fine-scale structure under realistic environmental conditions including surface friction. The simulated tornado repeatedly exhibits evolutions from one-cell to two-cell vortex, and subsequently to a multiple-vortex structure, where the vortex structure is sensitive to a swirl ratio. Subvortices in the multiple-vortex structure are located on the immediate inside of the radius of the maximum tangential wind speed, and cyclonically rotate around the tornado center with a slower speed less than half of the maximum tangential wind speed. The subvortices have a feature of a suction vortex accompanied by strong horizontal convergence and strong updraft near the surface. Although a superposition of the swirling winds associated with the subvortices and the parent tornado vortex causes locally intensified winds, the maximum horizontal and upward winds over the tornado's lifetime occur at the stage of shrinking of the vortex radius right before a transition to a multiple-vortex structure.
机译：进行了2012年5月6日筑波超级单体龙卷风的超高分辨率模拟，水平网格间距为10 m，以研究其在包括表面摩擦在内的实际环境条件下的精细尺度结构。模拟的龙卷风反复展现出从一个单元到两个单元的涡旋，然后发展到一个多涡旋结构，其中涡旋结构对涡旋比敏感。多涡旋结构中的子涡旋位于最大切向风速半径的内侧，并以小于最大切向风速一半的较慢速度绕龙卷风中心旋转。子涡流具有吸气涡流的特征，伴随着强烈的水平收敛和靠近地面的强烈上升气流。尽管与子涡旋和母龙卷风涡旋相关的旋风的叠加会引起局部增强风，但在旋涡半径缩小的阶段，即过渡到多涡旋之前，在龙卷风寿命期间会出现最大的水平风向和向上风向结构体。

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