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首页> 外文期刊>Journal of the Atmospheric Sciences >On the Characteristics of Linear-Phase Roll Vortices under a Moving Hurricane Boundary Layer
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On the Characteristics of Linear-Phase Roll Vortices under a Moving Hurricane Boundary Layer

机译：在移动飓风边界层下线性相辊涡流的特性

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Previous theoretical and numerical studies only focused on the formation of roll vortices (rolls) under a stationary and axisymmetric hurricane. The effect of the asymmetric wind structure induced by the storm movement on the roll characteristics remains unknown. In this study, we present the first attempt to investigate the characteristics of linear-phase rolls under a moving hurricane by embedding a linear two-dimensional (2D) roll-resolving model into a 3D hurricane boundary layer model. It is found that the roll horizontal wavelength under the moving hurricane is largely determined by the radial-shear-layer depth, defined as the thickness of the layer with positive radial wind shear. The horizontal distribution of the roll wavelength resembles the asymmetric pattern of the radial-shear-layer depth. Interestingly, the roll growth rate is not only affected by the radial wind shear magnitude alluded to in previous studies but also by the radial-shear-layer depth. A deeper (shallower) radial shear layer tends to decrease (increase) the roll growth rate. Such an effect is due to the presence of the bottom boundary. The bottom boundary constrains the lower-level roll streamlines and reduces the efficiency of rolls in extracting kinetic energy from the radial shear. This effect is more pronounced under a deeper shear layer, which favors the formation of larger-size rolls. This study improves the understanding of the main factors affecting the structure and growth of rolls and will provide guidance for interpreting the spatial distribution of rolls under realistic hurricanes in observations and high-resolution simulations.
机译：以往的理论和数值研究主要集中在静止和轴对称飓风下滚转涡（rolls）的形成。风暴运动引起的不对称风结构对横摇特性的影响尚不清楚。在这项研究中，我们首次尝试通过将线性二维（2D）滚动解析模型嵌入3D飓风边界层模型来研究移动飓风下线性相位滚动的特性。研究发现，移动飓风下的横摇水平波长在很大程度上取决于径向切变层深度，即具有正径向风切变的层的厚度。滚动波长的水平分布类似于径向剪切层深度的不对称模式。有趣的是，横滚增长率不仅受先前研究中提到的径向风切变量级的影响，还受径向切变层深度的影响。较深（较浅）的径向剪切层倾向于降低（增加）轧辊增长率。这种效应是由于底部边界的存在。底部边界限制了较低水平的轧辊流线，并降低了轧辊从径向剪切中提取动能的效率。这种效应在更深的剪切层下更为明显，这有利于形成更大尺寸的辊。这项研究提高了对影响转鼓结构和增长的主要因素的理解，并将为在观测和高分辨率模拟中解释真实飓风下转鼓的空间分布提供指导。

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