Life‐cycle simulations of shallow frontal waves and the impact of deformation strain
Life‐cycle simulations of shallow frontal waves and the impact of deformation strain
复制标题
浅锋面波的生命周期模拟和变形应变的影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Gray
中科院分区：
文献类型：
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作者：
H. Dacre;S. Gray
利用英国气象局非流体静力统一模型的理想化版本研究了浅锋面波的生命周期和变形应变对其发展的影响，该模型包括与业务预报模型相同的物理和动力学。锋面波的发展分为两个阶段：首先，锋面上施加变形应变，由锋面上升气流的潜热释放产生正位涡（PV）带；其次，随着变形应变的减小，PV条带分解为单个异常。与PV异常相关的环流导致浅锋面波的形成。模拟的锋面波结构与锋面气旋的概念模式一致。如果大气稳定性降低，则模拟较深的锋面波。
The life cycle of shallow frontal waves and the impact of deformation strain on their development is investigated using the idealized version of the Met Office non‐hydrostatic Unified Model which includes the same physics and dynamics as the operational forecast model. Frontal‐wave development occurs in two stages: first, a deformation strain is applied to a front and a positive potential‐vorticity (PV) strip forms, generated by latent‐heat release in the frontal updraught; second, as the deformation strain is reduced the PV strip breaks up into individual anomalies. The circulations associated with the PV anomalies cause shallow frontal waves to form. The structure of the simulated frontal waves is consistent with the conceptual model of a frontal cyclone. Deeper frontal waves are simulated if the stability of the atmosphere is reduced.