Daytime Boundary-Layer Evolution over Mountainous Terrain. Part 1: Observations of the Dry Circulations
Daytime Boundary-Layer Evolution over Mountainous Terrain. Part 1: Observations of the Dry Circulations
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山区地形的白天边界层演化。
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
R. Banta
中科院分区：
文献类型：
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作者：
R. Banta
本文介绍了由位温剖面所揭示的在一个广阔的山谷中伴随着白天局地风系统发展的边界层结构。它描述了这种结构如何导致在山脉的下风侧出现一个辐合区。以前的研究，主要是基于一维探测的潜在温度和水平风，已经表明，配置文件的静态稳定性和高空风的存在有一个重要的影响，白天的方式，热强迫风系统的发展。在本研究中，从飞机数据，垂直探测和表面mesonet数据获得的二维横截面显示了几个相关的功能。例如，在接近地面的上午中到晚些时候，上坡风在夜间逆温层（冷池）下面的浅混合层中形成;在这个冷池顶部以上的高度，存在对流混合的地面风。口角...
Abstract This paper presents the boundary layer structure which accompanies the development of daytime local wind systems in a broad mountain valley, as revealed by cross sections of potential temperature. It describes how this structure leads to the occurrence of a region of convergence to the downwind side of mountains. Previous studies, based primarily on one-dimensional sounding of potential temperature and horizontal winds, have shown that profiles of static stability and the presence of winds aloft have an important effect on the manner in which daytime, thermally-forced wind systems develop. In the present study, two-dimensional cross sections obtained from aircraft data, vertical soundings and surface mesonet data show several relevant features. In mid to late morning near the surface, for example, upslope winds form in a shallow mixed layer at the underside of the nocturnal inversion layer (cold pool); at elevations above the top of this cold pool, convectively-mixed surface winds exist. The spat...