The effect of latent cooling processes in tropical cyclone simulations
The effect of latent cooling processes in tropical cyclone simulations
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DOI：
10.1002/qj.495
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发表时间：
2009-10
影响因子：
8.9
通讯作者：
T. Frisius;T. Hasselbeck
中科院分区：
文献类型：
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作者：
T. Frisius;T. Hasselbeck
为了估计潜在冷却过程对热带气旋的作用，我们使用德国气象局的轴对称云解析模式HURMOD和全三维COSMO模式进行了灵敏度模拟。作为一种理想的初始状态，假设对流不稳定涡旋具有叠加熵异常。虽然在没有潜在冷却过程的模拟中，增长率和最大风速变得不自然地大，但这些过程的存在被证明是维持眼壁外对流所必需的，并被证明是热带气旋发展延迟的原因。后一种结果与格雷根据观察得出的结论一致。此外，成熟热带气旋的强度波动只有在模拟潜冷过程时才会发生。
In order to estimate the role of latent cooling processes for tropical cyclones, we have performed sensitivity simulations with both the axisymmetric cloud‐resolving model HURMOD and the fully three‐dimensional COSMO model of the German Weather Service. As an idealised initial state, a convectively unstable vortex with superimposed entropy anomalies has been assumed. While growth rate and maximum wind speeds become unnaturally large in simulations without latent cooling processes, the presence of these processes proves to be necessary to maintain convection outside the eyewall and turns out to be responsible for a delayed development of the tropical cyclone. The latter result is in accordance with the findings of Gray, based on observations. Furthermore, intensity fluctuations of the mature tropical cyclone only occur in HURMOD when latent cooling processes are simulated.