Parameters of Cloud Ice Particles Retrieved from Radar Data
Parameters of Cloud Ice Particles Retrieved from Radar Data
复制标题
从雷达数据反演的云冰粒子参数
DOI：
10.1175/jtech-d-16-0123.1
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发表时间：
2017
影响因子：
2.2
通讯作者：
V. Melnikov
中科院分区：
文献类型：
--
作者：
V. Melnikov
本文利用S波段WSR-88 D雷达测得的雷达微分反射率（ZDR）和共极相关系数（ρhv）反演了云冰粒的平均轴比（长宽比）和定向度。极化通道中的硬件微分相位和放大影响测得的ZDR和ρhv，并在反演过程中予以考虑。对六棱柱体粒子进行了反演，六棱柱体粒子比常用的椭球体粒子更接近于真实的云粒子的形状。棱柱体的中轴比中值大于椭球体。在信噪比大于10 dB的地区，雷达回波起伏引起的统计1σ反演误差约为40%。定向度的值位于2°至23°的区间内，这表明冰粒的定向最有可能由风场引起的显著扰动。
AbstractThe mean axis ratio (length/width) and the degree of orientation of cloud ice particles are retrieved from radar differential reflectivity (ZDR) and the copolar correlation coefficient (ρhv) measured with the S-band WSR-88D radar. Hardware differential phases and amplifications in the polarimetric channels affect measured ZDR and ρhv and are taken into consideration in the retrieval procedure. The retrieval is performed for particles in shapes of hexagonal prisms, which are closer to shapes of real cloud particles than frequently used spheroids. The median retrieved axis ratio for prisms is larger than that for spheroids. The statistical 1σ retrieval errors caused by fluctuations of radar returns are about 40% in areas of signal-to-noise ratios stronger than 10 dB. The values of the degree of orientation lie in an interval from 2° to 23°, which points to significant perturbations in the orientations of ice particles most likely caused by the wind field.
影响因子：
8.9
作者：
C. Westbrook;A. Illingworth;E. O'connor;R. Hogan
通讯作者：
C. Westbrook;A. Illingworth;E. O'connor;R. Hogan