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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Role of the Vertical Structure of a Simulated Tropical Cyclone in Its Motion: A Case Study of Typhoon Fengshen (2008)
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Role of the Vertical Structure of a Simulated Tropical Cyclone in Its Motion: A Case Study of Typhoon Fengshen (2008)

机译：模拟热带气旋垂直结构在其运动中的作用：以台风“风神”为例（2008年）

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References(26) Typhoon Fengshen (2008) was marked by a persistent track toward the northwest, which was poorly predicted by an operational hydrostatic model, which indicated a significant northward bias. Using a global nonhydrostatic model with finer grid spacing, we have simulated a reliable track of this typhoon. The purpose of this study is to clarify the causes of the northward bias by comparing the output of the two models. This typhoon was marked by the asymmetry of rainfall concentrating in the downshear side. While both models could reproduce the asymmetric structure, a significant difference between them was found in the vertical structure. In the hydrostatic model, the vortex tilted to the downshear side with a displacement from lower to upper levels exceeding 100 km. This tilt was related to weak updrafts of, at most, 0.5 m s?1. Diagnosis using vorticity budget demonstrated that the tilt of the vortex resulted from a lack of vertical coupling that was too weak to withstand differential advection between the lower and upper levels. These results suggest the importance of reproducing inner-core updrafts for better track prediction of a typhoon in an environment with strong vertical shear.
机译：参考文献（26）台风“风神”（2008）的特征是向西北方向持续走行，而实际的静水力模型却很难预测到该情况，这表明北风偏向很大。使用具有更细网格间距的全局非静水模型，我们模拟了该台风的可靠轨道。本研究的目的是通过比较两个模型的输出来弄清北偏的原因。这次台风的特征是下切面降雨集中不对称。虽然两个模型都可以再现非对称结构，但在垂直结构中发现了它们之间的显着差异。在静水力模型中，涡旋向下剪切侧倾斜，从上到下的位移超过100 km。这种倾斜与最多0.5 m s？1的弱上升气流有关。使用涡度预算进行的诊断表明，涡旋的倾斜是由于缺乏垂直耦合造成的，垂直耦合太弱而无法承受上下两层之间的对流。这些结果表明，在垂直剪切力强的环境中，再现内芯上升气流对于更好地预测台风的重要性。

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