Clear Air Turbulence as a Response to Meso- and Synoptic-Scale Dynamic Processes
Clear Air Turbulence as a Response to Meso- and Synoptic-Scale Dynamic Processes
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晴空湍流作为对中观和天气尺度动态过程的响应
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
J. Keller
中科院分区：
文献类型：
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作者：
J. Keller
摘要在等熵坐标系中建立了层积分能量方程和Richardson数趋势方程。这个公式导致罗奇方程的能量耗散率由于晴空湍流（CAT）。方程的ln（Ri）的趋势诊断应用到网格从一个客观的等熵分析存档的探测有据可查的现场研究CAT。理查森数的趋势方程是投在预测的形式。使用半语言平流计划，它被应用为一个机械模型，以检查理查森数场的演变超过12小时的时间周期的几种情况。其中包括实地研究和两个有试点报告支持的最近案例。启发式的论点表明，罗奇方程的湍流耗散率应更严格地限制在其应用比原来提出的。对α中尺度Richardson数和Richardson数趋势场的分析揭示了一种位相关系。
Abstract Equations for layer-integrated energy and Richardson number tendencies are formulated in isentropic co-ordinates. This formulation leads to the Roach equation for the rate of energy dissipation due to clear air turbulence (CAT). The equation governing the ln(Ri) tendency is applied diagnostically to grids from an objective isentropic analysis of archived soundings for a well documented field study of CAT. The Richardson number tendency equation is cast in prognostic form. Using a semi-language advection scheme, it is applied as a mechanistic model to examine the evolution of the Richardson number fields over 12-hour time periods for several cases. These include the field study and two much more recent cases supported by pilot reports. Heuristic arguments show that the Roach equation for the turbulent dissipation rate should be more restricted in its application than originally presented. Analyses of meso-alpha scale Richardson number and Richardson number tendency fields reveal a phase relationsh...