Multiple Regimes of Wind, Stratification, and Turbulence in the Stable Boundary Layer
Multiple Regimes of Wind, Stratification, and Turbulence in the Stable Boundary Layer
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DOI：
10.1175/jas-d-14-0311.1
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发表时间：
2015-08
影响因子：
3.1
通讯作者：
A. Monahan;T. Rees;Yanping He;Norman A. McFarlane
中科院分区：
文献类型：
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作者：
A. Monahan;T. Rees;Yanping He;Norman A. McFarlane
从荷兰Cabauw 213米塔获得的高分辨率风和位温资料的长时间序列表明，在这个位置存在两种不同的稳定分层夜间边界层。隐马尔可夫模型（HMM）分析是用来客观地描述这些制度和分类个别观察到的状态。第一个制度的特点是强烈的稳定层结，10和200米之间的风速差大，湍流相对较弱。第二个是与近中性层结，10和200米之间的风速差较弱，相对较强的湍流。在第二种状态下，边界层的状态与白天相似。这些制度的占领统计示出的大尺度压力梯度力和云量的协变，使第一制度占主导地位，晴空弱地转风速和第二制度predomin…
AbstractA long time series of temporally high-resolution wind and potential temperature data from the 213-m tower at Cabauw in the Netherlands demonstrates the existence of two distinct regimes of the stably stratified nocturnal boundary layer at this location. Hidden Markov model (HMM) analysis is used to objectively characterize these regimes and classify individual observed states. The first regime is characterized by strongly stable stratification, large wind speed differences between 10 and 200 m, and relatively weak turbulence. The second is associated with near-neutral stratification, weaker wind speed differences between 10 and 200 m, and relatively strong turbulence. In this second regime, the state of the boundary layer is similar to that during the day. The occupation statistics of these regimes are shown to covary with the large-scale pressure gradient force and cloud cover such that the first regime predominates under clear skies with weak geostrophic wind speed and the second regime predomin...