Persistent Horizontal Rolls in the Urban Mixed Layer as Revealed by Dual-Doppler Radar
Persistent Horizontal Rolls in the Urban Mixed Layer as Revealed by Dual-Doppler Radar
复制标题
双多普勒雷达揭示的城市混合层持续水平滚动
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
N. Kohn
中科院分区：
文献类型：
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作者：
R. Kropfli;N. Kohn
波传播实验室（WPL）的双多普勒雷达系统已被用于METROMEX研究的影响，一个大的城市地区（圣路易斯）的行星混合层内的空气运动在明确的条件。结果表明，飞机投放的金属箔片可以用来跟踪几百平方公里区域内的空气运动，并通过整个深度的发展混合层。两天的资料具有相似的温度和风廓线已被选中进行讨论。这两组数据都表明，在整个观测期间（20-70分钟）和在箔条云范围之外（8-12公里）存在水平滚转涡。与温度场的比较表明，在地表以上300米处的一条辐合线（10 - 3 s-1）与怀俄明州大学飞机上的仪器测量到的约0.2°C的热脊相吻合。这两天明显的滚动结构的差异可以解释为…
Abstract The Wave Propagation Laboratory (WPL) dual-Doppler radar system has been used in METROMEX to study the effect of a large urban area (St. Louis) on air motions within the planetary mixing layer during clear conditions. It was demonstrated that aircraft-dispensed chaff could be used to trace the air motion over a several hundred square kilometer area and through the entire depth of the developed mixing layer. Data from two days having similar temperature and wind profiles have been selected for discussion. Both data sets suggest the presence of horizontal roll vortices existing throughout the duration of the observations (20–70 min) and beyond the extent of the chaff cloud (8–12 km). A comparison with the temperature field reveals that a line of convergence (∼10−3 s−1) 300 m above the surface was found to coincide with a thermal ridge of about 0.2°C measured by instruments on the University of Wyoming aircraft. Differences in the apparent roll structures on these two days may be explained in terms ...