Energy Dissipation Within Intermittent Clear Air Turbulence Patches
Energy Dissipation Within Intermittent Clear Air Turbulence Patches
复制标题
间歇性晴空湍流斑块内的能量耗散
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Cadet
中科院分区：
文献类型：
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作者：
D. Cadet
摘要 平流层下部动能的平均耗散率是根据发射用于测量 200 mb 高度的垂直风切变的仪器化超压恒定高度气球获得的数据估算的。飞行记录显示，当气球位于山区上空时，遇到了局部湍流。该记录分为20个时期。计算每个周期的结构函数，并在惯性子范围的假设下，依次估计每个周期的平均耗散。我们的计算表明，在短至几十公里的距离内，动能的平均耗散率可能会有很大变化。因此，当剪切层破裂时，平均耗散率可能比事件发生之前或之后高出 10 倍。在中等强度的晴空湍流区域内，它也可能比在非常弱强度的湍流区域内高 100 倍。这些结果表明...的零星性质。
Abstract Mean dissipation rates of kinetic energy in the lower stratosphere are estimated from data obtained with an instrumented, superpressure, constant-level balloon launched to measure the vertical wind shear at 200 mb. The flight record shows that while the balloon was located above a mountainous region localized patches of turbulence were encountered. The record is divided into 20 periods. The structure function is calculated over each period and, under the hypothesis of an inertial subrange, the mean dissipation is in turn estimated over each period. Our calculations indicate that the mean dissipation rate of kinetic energy can vary to a great extent over distances as short as a few tens of kilometers. Thus, when the shear layer breaks down, the mean dissipation rate can be 10 times higher than just before or after the event. It can also be 100 times higher within moderately intense clear air turbulence patches than in very weak intensity turbulence zones. These results show the sporadic nature of ...