Diurnal Wind Cycles Forcing Inertial Oscillations: A Latitude-Dependent Resonance Phenomenon
Diurnal Wind Cycles Forcing Inertial Oscillations: A Latitude-Dependent Resonance Phenomenon
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DOI：
10.1175/jas-d-13-0124.1
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发表时间：
2014-01
影响因子：
3.1
通讯作者：
R. Shibuya;Kaoru Sato;M. Nakanishi
中科院分区：
文献类型：
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作者：
R. Shibuya;Kaoru Sato;M. Nakanishi
用大涡模拟(LES)研究了大气边界层(ABL)中惯性振荡(IO)随纬度的变化规律。以前使用LES的研究无法在几天的时间尺度上模拟这样的ABL，因为计算成本很高。通过使用一个简单辐射方案的LES，本研究成功地模拟了夜间稳定层上ABL的日行为作为纬度的函数。通过与Wangara试验的对比，证实了模式模拟的真实性。结果表明，IO仅在惯性周期分别为24和12小时的两个纬度出现类共振放大，全天都观察到强烈依赖于纬度的水平风振荡。振荡幅度在夜间稳定层稍高处最大。这一最大值似乎对应于夜间低空急流，其机制从IO的角度进行了解释。..。
AbstractThe latitudinal dependence of inertial oscillation (IO) in a diurnally evolving atmospheric boundary layer (ABL) is examined using a large-eddy simulation (LES). Previous studies that used LES were unable to simulate such an ABL on a time scale of several days because of high computational cost. By using an LES with a simple radiation scheme, the present study has succeeded in simulating the diurnal behavior of the ABL above the nocturnal stable layer as a function of the latitude. The reality of model simulations is confirmed by comparison with Wangara experiments.It is shown that a resonance-like amplification of the IO appears only at two latitudes where the respective inertial periods are 24 and 12 h. A horizontal wind oscillation with strong dependence on latitude is observed during an entire day. The oscillation amplitude is maximized slightly above the nocturnal stable layer. It seems that this maximum corresponds to the nocturnal low-level jet, whose mechanism is explained in terms of IO. ...