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首页> 外文期刊>Journal of the Atmospheric Sciences >AN ANALYTICAL STUDY OF DENSITY CURRENTS IN SHEARED, STRATIFIED FLUIDS INCLUDING THE EFFECTS OF LATENT HEATING
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AN ANALYTICAL STUDY OF DENSITY CURRENTS IN SHEARED, STRATIFIED FLUIDS INCLUDING THE EFFECTS OF LATENT HEATING

机译：剪切，分层流体中密度流的分析研究，包括潜热的影响

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摘要

A nonlinear analytic model is used to study the bulk characteristics of energy conserving density currents in stratified and sheared environments. The idealized representation of latent heating in a stratified flow is a unique feature that interactively couples the dynamic and thermodynamic fields. A stable stratification decreases the height of density currents but increases the corresponding propagation speed. In contrast, the density current is deeper and moves more slowly once latent heating is included. As for the effect of shear, the depth and the translation speed of density currents increase as the ambient shear varies from negative to positive (in the direction of propagation), with the exception of a strongly stable environment. A key addition to density current dynamics is the upper-level overturning circulation ahead of the system. This feature is Very different from the blocked or choked upper-level structure found in the companion paper of Liu and Moncrieff. The distinction is attributed to the effect of different shear profiles on density current dynamics. These analytic results quantifying the role of shear and latent heating in density-current-like phenomena in the atmosphere should now be evaluated against high-resolution numerical simulations and observations. [References: 34]
机译：非线性分析模型用于研究分层和剪切环境中能量守恒密度电流的整体特征。分层流中潜热的理想化表示是将动力学场和热力学场相互作用耦合的独特功能。稳定的分层降低了密度电流的高度，但增加了相应的传播速度。相反，一旦包含潜热，密度电流将变深，移动速度将变慢。至于剪切的影响，除了强烈稳定的环境外，随着环境剪切从负到正（在传播方向上）变化，密度电流的深度和平移速度会增加。密度电流动态特性的一个关键补充是系统前面的高层翻转循环。此功能与Liu和Moncrieff随行论文中发现的阻塞或阻塞的高层结构有很大不同。区别归因于不同的剪切曲线对密度电流动力学的影响。这些分析结果量化了剪切和潜热在大气中类似密度电流的现象中的作用，现在应该根据高分辨率的数值模拟和观测进行评估。 [参考：34]

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