An analysis of vertical velocity spectra obtained in the bomex fair-weather, trade-wind boundary layer
An analysis of vertical velocity spectra obtained in the bomex fair-weather, trade-wind boundary layer
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对 bomex 晴天、信风边界层中获得的垂直速度谱的分析
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
R. Grossman
中科院分区：
文献类型：
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作者：
R. Grossman
根据Monin-Obukhov稳定长度的估计，对巴巴多斯海洋和气象实验(Bomex)期间在海上沿风飞行的飞机上测量的垂直速度波动频谱进行了分层和合成。这样做是为了检验这样一种假设，即对风的切变和浮力做出反应的一系列物理机制在海洋次云层的湍流传输过程中是活跃的。尽管数据可能包含与航向无关的偏差，但得出的结论是，涡旋结构在很小的稳定度范围内发生了重大变化。这与早期关于陆地对流的理论和对鲱鸥飞行特征的观察很好地吻合。光谱成分的垂直变化与陆地和海洋上的其他观测结果相比是有利的。建议使用物理模型来解释这些数据。其中一个模型与环状对流的理论结果是一致的。光谱数据在大约10公里处开始失去信心，表明海洋上的涡旋的极限大小大约是次云层深度(在本例中为600米)的两倍，而不考虑涡旋结构的类型。
Spectra of vertical velocity fluctuations measured on board an aircraft flying over the sea along and across the wind during the Barbados Oceanographic and Meteorological Experiment (BOMEX) are stratified and composited according to estimates of the Monin-Obukhov stability length. This was done to test the hypothesis that a hierarchy of physical mechanisms, responding to wind shear and buoyancy, is active in the turbulent transfer processes of the oceanic subcloud layer. Despite the possibility that the data contain a heading-independent bias, it is concluded that a major change of eddy structure occurs over a narrow range of stability. This agrees well with an early theory on convection over land and observations of herring gull flight characteristics. The vertical variation of the spectral-composites compares favorably with other observations over land and sea. Physical models are suggested to explain the data. One of these models is in agreement with theoretical results concerning ringlike convection. The spectral data, which begin to lose confidence at about 10 km, suggest that a limiting size of eddies over the ocean is approximately twice the depth of the subcloud layer (in this case 600 m) regardless of the kind of eddy structure.