A Unified Perspective on the Dynamics of Axisymmetric Hurricanes and Monsoons
A Unified Perspective on the Dynamics of Axisymmetric Hurricanes and Monsoons
复制标题
轴对称飓风和季风动力学的统一视角
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
T. Dunkerton
中科院分区：
文献类型：
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作者：
V. Wirth;T. Dunkerton
摘要本文提供了一个统一的观点，飓风和季风涡的动力学，通过确定他们作为一个更一般的流动系统的具体限制情况。这个更一般的系统被定义为在f平面上的稳定分层非Boussinesq大气的稳态轴对称平衡流。该模式是基于原始方程假设梯度风平衡的径向动量方程。通过在涡流中心加热来强制流动，这被实现为朝向指定的平衡温度Te的松弛。流动通过表面摩擦消散，并且假定内部几乎是无粘性的。加热被假定为超临界，这意味着Te不允许零表面风的常规热平衡解决方案，并引起交叉涡旋二次环流。数值解采用时间步进到稳定状态，其中在每一步Eliassen二次环流被诊断为部分…
Abstract This paper provides a unified perspective on the dynamics of hurricane- and monsoonlike vortices by identifying them as specific limiting cases of a more general flow system. This more general system is defined as stationary axisymmetric balanced flow of a stably stratified non-Boussinesq atmosphere on the f plane. The model is based on the primitive equations assuming gradient wind balance in the radial momentum equation. The flow is forced by heating in the vortex center, which is implemented as relaxation toward a specified equilibrium temperature Te. The flow is dissipated through surface friction, and it is assumed to be almost inviscid in the interior. The heating is assumed supercritical, which means that Te does not allow a regular thermal equilibrium solution with zero surface wind, and which gives rise to a cross-vortex secondary circulation. Numerical solutions are obtained using time stepping to a steady state, where at each step the Eliassen secondary circulation is diagnosed as part...