The Australian nocturnal jet and diurnal variations of boundary‐layer winds over Mt. Isa in North‐eastern Australia
The Australian nocturnal jet and diurnal variations of boundary‐layer winds over Mt. Isa in North‐eastern Australia
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澳大利亚东北部伊萨山夜间急流和边界层风的日变化
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
P. May
中科院分区：
文献类型：
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作者：
P. May
对无线电探空仪数据的分析表明，澳大利亚上空的夜间边界层急流在尺度上是大陆性的。利用两年的边界层风廓线资料描述了急流的详细时间发展。澳大利亚东北部的伊萨。发现了一个明显的等压风，它在惯性周期附近有一个光谱峰值。这与澳大利亚中部和西部的昼夜气压振荡和热低的发展有关。然而，这对夜间急流的发展并不重要。夜间急流开始时是一种浅层扰动，并在夜间不断增长。一年中的大部分时间，最大风速都在离地面约500米的高度，并且有一个清晰的急流轮廓。在夏季风季节，最大风的垂直范围增大，但垂直切变较弱。喷流是惯性反应的结果，但受其他过程的影响。急流的幅度小于对白天非地转流的直接响应，并且在深夜有超惯性旋转和风矢量的衰减。
An analysis of radiosonde data shows the nocturnal boundary-layer jet over Australia to be continental in scale. the detailed temporal development of the jet is described using two years of boundary-layer wind-profiler data from Mt. Isa in north-eastern Australia. A distinct isallobaric wind is found, which has a spectral peak near the inertial period. This is associated with the diurnal pressure-oscillation and developments in the heat low over central and western Australia. However, it is not important for the development of the nocturnal jet. the nocturnal jet begins as a shallow disturbance and grows through the night. Most of the year the wind maximum is at about 500 m above the ground and has a well-defined jet-profile. In the summer-monsoon season the vertical extent of the wind maximum increases, but has weaker vertical shear. the jet results from an inertial response, but is affected by other processes. the amplitude of the jet is less than would be expected from a straightforward response to the daytime ageostrophic flow and there is super-inertial rotation and damping of the wind vector late in the night.