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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar over Oklahoma City during JU2003
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Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar over Oklahoma City during JU2003

机译：2003年7月俄克拉荷马城多普勒激光雷达观测到的夜间低空急流控制的大气边界层

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摘要

Boundary layer wind data observed by a Doppler lidar and sonic anemometers during the mornings of three intensive observational periods (IOP2, IOP3, and IOP7) of the Joint Urban 2003 (JU2003) field experiment are analyzed to extract the mean and turbulent characteristics of airflow over Oklahoma City, Oklahoma. A strong nocturnal low-level jet (LLJ) dominated the flow in the boundary layer over the measurement domain from midnight to the morning hours. Lidar scans through the LLJ taken after sunriseindicate that the LLJ elevation shows a gradual increase of 25-100 m over the urban area relative to that over the upstream suburban area. The mean wind speed beneath the jet over the urban area is about 10%-15% slower than that over the suburban area. Sonic anemometer observations combined with Doppler lidar observations in the urban and suburban areas are also analyzed to investigate the boundary layer turbulence production in the LLJ-dominated atmospheric boundary layer. The turbulence kinetic energywas higher over the urban domain mainly because of the shear production of building surfaces and building wakes. Direct transport of turbulent momentum flux from the LLJ to the urban street level was very small because of the relatively high elevation of the jet. However, since the LLJ dominated the mean wind in the boundary layer, the turbulence kinetic energy in the urban domain is correlated directly with the LLJ maximum speed and inversely with its height. The results indicate that the jet Richardson number is a reasonably good indicator for turbulent kinetic energy over the urban domain in the LLJ-dominated atmospheric boundary layer.
机译：分析了联合城市2003年（JU2003）野外实验的三个密集观测时段（IOP2，IOP3和IOP7）早晨由多普勒激光雷达和声速风速计观测到的边界层风数据，以提取整个区域气流的均值和湍流特征。俄克拉荷马州俄克拉荷马城。从午夜到凌晨，强夜空低空急流（LLJ）主导了测量区域边界层的流动。激光雷达扫描日出后拍摄的LLJ，表明LLJ海拔高度相对于上游郊区而言，在市区逐渐增加了25-100 m。市区喷气流下方的平均风速比郊区慢10％-15％。还分析了声速风速仪观测值和多普勒激光雷达观测值在市区和郊区的结合情况，以研究以LLJ为主的大气边界层中的边界层湍流产生。湍流动能在城市范围内较高，这主要是由于建筑物表面和建筑物尾迹的剪切产生。由于急流的高度相对较高，湍流动量通量从LLJ到城市街道的直接传输非常小。但是，由于LLJ占边界层的平均风，因此市区内的湍流动能直接与LLJ最大速度相关，而与LLJ的高度成反比。结果表明，喷气李察逊数是LLJ主导的大气边界层中城市范围内湍动能的合理良好指标。

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