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风廓线雷达作为一种新型遥感设备,其回波信号包含丰富的湍流信息。提出了一种利用风廓线雷达回波信号反演动力湍流的方法,分析了对流层速度结构常数C2v的变化特征,并根据近地面速度湍流模型研究了对流层湍流速度脉动的特性。结果表明:1)动力湍流强度随高度增加逐渐减弱,夜间减弱速度大于白天,且在边界层顶处C2v具有较明显的日变化特征;2)C2v与速度起伏方差σ2的对数值具有较好的线性关系,线性拟合度达0.896;3)对流层湍流的速度脉动较弱,σ2量级在10-3~10-2 m2·s-2之间。
Wind profiler radar as a new type of remote sensing device, the echo signal contains a wealth of turbulence information. A method to recover dynamic turbulence using wind profile radar echo signals is proposed. The variation characteristics of tropospheric structure constant C2v are analyzed. The characteristics of turbulent velocity pulsation in the troposphere are studied based on the near-surface turbulence model. The results show that: 1) The dynamic turbulence intensity decreases gradually with the increase of altitude, and the attenuation rate of nighttime is greater than that of daytime. And C2v has obvious diurnal variation at the top of boundary layer. 2) The logarithm of C2v and velocity fluctuation σ2 has good Linearity and linearity of 0.896. 3) Velocity turbulence in the troposphere is weakly pulsating, and the magnitude of σ2 is between 10-3 and 10-2 m2 · s-2.