Three-Dimensional Numerical Modeling of Convection Produced by Interacting Thunderstorm Outflows. Part II: Variations in Vertical Wind Shear
Three-Dimensional Numerical Modeling of Convection Produced by Interacting Thunderstorm Outflows. Part II: Variations in Vertical Wind Shear
复制标题
雷暴流出相互作用产生的对流的三维数值模拟。
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
R. Wilhelmson
中科院分区：
文献类型：
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作者：
K. Droegemeier;R. Wilhelmson
本文是外流相互作用系列的第二篇论文，我们使用第一部分中描述的三维模式来研究垂直风切变变化对沿着相交雷暴外流边界云发展的影响。本研究使用三种风切变廓线：仅云底上方切变、仅云底下方切变及云底上方与云底下方切变。与第一部分一样，切变是单向的，方向垂直于包含两个初始外流产生云（相隔16公里）的线。使用第一部分中控制模拟的环境热力学结构，我们改变了每个剖面中的切变幅度，并研究了两个外流碰撞（外流碰撞线或CL）区域中云发展的特性。模式结果表明，前两个云的强度和连续的单元上升气流的最大值之间的时间间隔沿着CL（这两个都是由流出colli触发）。
Abstract In this second paper in a series on outflow interactions, we use the three-dimensional model described in Part I to examine the effects of vertical wind shear variations on cloud development along intersecting thunderstorm outflow boundaries. Three wind shear profiles are used in this study: shear only above cloud base, shear only below cloud base, and shear both above and below cloud base. As in Part I, the shear is unidirectional and is oriented perpendicular to the line containing the two initial outflow-producing clouds (which are spaced 16 km apart). Using the environmental thermodynamic structure from the control simulation in Part I, we vary the shear magnitude in each profile and examine the properties of cloud development in the region where the two outflows collide (the outflow collision line or CL). The model results show that the intensity and the time interval between successive cell updraft maxima of the first two clouds along the CL (both of which are triggered by the outflow colli...