A Study of the Convective Boundary-Layer Dynamics Using Single Doppler Radar Measurements.
A Study of the Convective Boundary-Layer Dynamics Using Single Doppler Radar Measurements.
复制标题
使用单多普勒雷达测量的对流边界层动力学研究。
DOI：
--
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. Gal
中科院分区：
文献类型：
--
作者：
Mei Xu;T. Gal
摘要利用单多普勒雷达观测资料研究了有切变的对流行星边界层的运动学和动力学特征。这些数据是使用由美国国家海洋和大气管理局波传播实验室操作的单K波段（0.87厘米）多普勒雷达收集的。一种分析技术已经开发和测试，这是一个扩展的速度方位显示（VAD）。详细介绍了该技术及其相关的误差分析。剖面的平均风，垂直速度，相关的动量通量和方差估计。与CBL的经典图像一致，垂直速度方差的轮廓在混合层的下部达到相对最大值。大幅度的垂直通量的水平动量被发现在混合层的顶部，而逆梯度动量通量被发现在CBL的一部分。利用多普勒频谱的二阶矩，从而实现了对目标的跟踪。
Abstract The kinematic and dynamical properties of the convective planetary boundary layer (CBL) with shear are studied using single Doppler radar measurements. The data were collected using single K-band (0.87 cm) Doppler radar operated by the National Oceanic and Atmospheric Administration Wave Propagation Laboratory. An analysis technique has been developed and tested that is an extension of the velocity azimuth display (VAD). The technique and its associated error analysis are described in detail. Profiles of the mean wind, vertical velocity, associated momentum fluxes, and variances are estimated. In agreement with the classical picture of the CBL, the profile of the vertical velocity variance achieves a relative maximum magnitude in the lower part of the mixed layer. Large magnitudes of vertical flux of horizontal momentum are found at the top of the mixed layer, while countergradient momentum fluxes are found in part of the CBL. The second moment of the Doppler spectrum is utilized, so that the mom...