On Thermally Forced Circulations over Heated Terrain
On Thermally Forced Circulations over Heated Terrain
复制标题
关于加热地形上的热力循环
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Kirshbaum
中科院分区：
文献类型：
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作者：
D. Kirshbaum
摘要采用解析模式和数值模式相结合的方法，研究了逐日加热地形上热力强迫环流的动力学。解决方案获得两层流动（代表边界层和上覆的自由对流层）在一个孤立的山形热源。的线性化Boussinesq方程组的基础上的缩放开发，以量化热强迫上升气流的强度，并确定三个流态，每个具有不同的动态和参数的敏感性。这种缩放密切匹配相应的数值模拟在这些制度中的两个：第一个特点是由弱稳定的边界层和显着的背景风，第二个由强稳定的边界层。在第三个政权，其特点是弱风和弱边界层稳定性，这种缩放是优于一个根本不同的缩放的基础上热力学热机。在这种情况下，无法通风或…
AbstractA combination of analytical and numerical models is used to gain insight into the dynamics of thermally forced circulations over diurnally heated terrain. Solutions are obtained for two-layer flows (representing the boundary layer and the overlying free troposphere) over an isolated mountainlike heat source. A scaling based on the linearized Boussinesq system of equations is developed to quantify the strength of thermally forced updrafts and to identify three flow regimes, each with distinct dynamics and parameter sensitivities. This scaling closely matches corresponding numerical simulations in two of these regimes: the first characterized by a weakly stable boundary layer and significant background winds and the second by a strongly stable boundary layer. In the third regime, characterized by weak winds and weak boundary layer stability, this scaling is outperformed by a fundamentally different scaling based on thermodynamic heat engines. Within this regime, the inability of wind ventilation or ...