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首页> 外文期刊>Journal of the Atmospheric Sciences >On the Dynamics of Tropical Cyclone and Trough Interactions
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On the Dynamics of Tropical Cyclone and Trough Interactions

机译：论热带气旋和槽互动的动态

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The interaction between a tropical cyclone (TC) and an upper-level trough is simulated in an idealized framework using Coupled Ocean-Atmosphere Mesoscale Prediction System (COAMPS) for Tropical Cyclones (COAMPS-TC) on a plane. We explore the effect of the trough on the environment, structure, and intensity of the TC. In a simulation that does not have a trough, environmental inertial stability is dominated by Coriolis, and outflow remains preferentially directed equatorward throughout the simulation. In the presence of a trough, negative storm-relative tangential wind in the base of the trough reduces the inertial stability such that the outflow shifts from equatorward to poleward. This interaction results in a similar to 24-h period of enhanced upper-level divergence coincident with intensification of the TC. Sensitivity tests reveal that if the TC is too far from the trough, favorable interaction does not occur. If the TC is too close to the trough, the storm weakens because of enhanced vertical wind shear. Only when the relative distance between the TC and the trough is 0.2-0.3 times the wavelength of the trough in x and 0.8-1.2 times the amplitude of the trough in y does favorable interaction and TC intensification occur. However, stochastic effects make it difficult to isolate the intensity change associated directly with the trough interaction. Outflow is found to be predominantly ageostrophic at small radii and deflects to the right (in the Northern Hemisphere) since it is unbalanced. The outflow becomes predominantly geostrophic at larger radii but not before a rightward deflection has already occurred. This finding sheds light on why the outflow accelerates toward but generally never reaches the region of lowest inertial stability.
机译：在一个理想的框架内，利用热带气旋（COAMPS-TC）海气耦合中尺度预报系统（COAMPS）在平面上模拟了热带气旋（TC）与高空槽之间的相互作用。我们探讨了槽对TC的环境、结构和强度的影响。在没有波谷的模拟中，环境惯性稳定性由科里奥利决定，在整个模拟过程中，流出优先保持向赤道方向。在有槽的情况下，槽底的负风暴相对切向风会降低惯性稳定性，从而使流出从赤道向极移。这种相互作用导致类似于24小时的高层辐散增强，同时TC加剧。敏感性测试表明，如果TC离谷底太远，则不会发生有利的相互作用。如果热带气旋离低谷太近，由于垂直风切变增强，风暴减弱。只有当TC和波谷之间的相对距离是波谷波长在x轴上的0.2-0.3倍，波谷振幅在y轴上的0.8-1.2倍时，才会发生有利的相互作用和TC增强。然而，随机效应使得很难分离出与波谷相互作用直接相关的强度变化。在小半径处，流出主要是非地转的，由于不平衡，流出向右偏转（在北半球）。在更大的半径下，流出主要是地转的，但在向右偏转之前不会发生。这一发现揭示了为什么流出会加速，但通常不会达到惯性稳定性最低的区域。

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