Numerical Simulation of Radial Cloud Bands within the Upper-Level Outflow of an Observed Mesoscale Convective System
Numerical Simulation of Radial Cloud Bands within the Upper-Level Outflow of an Observed Mesoscale Convective System
复制标题
观测到的中尺度对流系统高层外流中径向云带的数值模拟
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Frehlich
中科院分区：
文献类型：
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作者：
S. Trier;R. Sharman;R. Fovell;R. Frehlich
摘要在中尺度对流系统（MCS）中，从上游深对流向外径向延伸的卷云砧云带内经常出现影响飞机的湍流。一个高分辨率的对流允许模式被用来模拟2005年6月17日观察到的这种类型的带。这些模拟波段的时间、位置和方向与这种情况下的卫星图像相似。带之间的10-20公里的水平间距也类似于在最近的卫星气候学MCS引起的径向流出带中发现的典型间距。模拟的频带结果从浅对流在近中性到弱不稳定MCS外砧。砧层的弱层结、谱带水平波长与近中性砧层深度之比（5：1 ~ 10：1）、谱带取向近似平行于同层垂直切变，这些特征与大气边界层中水平对流卷的相应特征相似。
Abstract Turbulence affecting aircraft is frequently reported within bands of cirrus anvil cloud extending radially outward from upstream deep convection in mesoscale convective systems (MCSs). A high-resolution convection permitting model is used to simulate bands of this type observed on 17 June 2005. The timing, location, and orientation of these simulated bands are similar to those in satellite imagery for this case. The 10–20-km horizontal spacing between the bands is also similar to typical spacing found in a recent satellite-based climatology of MCS-induced radial outflow bands. The simulated bands result from shallow convection in the near-neutral to weakly unstable MCS outer anvil. The weak stratification of the anvil, the ratio of band horizontal wavelength to the depth of the near-neutral anvil layer (5:1 to 10:1), and band orientation approximately parallel to the vertical shear within the same layer are similar to corresponding aspects of horizontal convective rolls in the atmospheric boundar...