摘要
利用C-波段双线偏振雷达定量测量降雨及识别粒子相态的关键是数据的精度,而雨区对雷达波的衰减是造成探测误差的重要因素。本文给出了在不同雨滴谱参数时,雨区对5.6cm波长水平、垂直偏振雷达波的衰减系数与Z_H,Z_(DR)的关系式,讨论并模拟计算了温度、谱型变化、数据平滑和雷达系统误差对雨区衰减订正结果的影响。结果表明:雨区衰减使测得的Z_H,Z_(DR)变小,只要Z_H的雷达系统测量误差不大,其它因素的变化对订正结果影响不大,雨区衰减订正可大大改善Z_H,Z_(DR)的测量结果。Z_H的雷达系统测量误差是影响订正结果的关键,特别是正的系统误差。
The critical problem in measuring rainfall rate and distinguishing the phase of hydrometeors by dual linear polarization radar is the data accuracy, and the microwave attenuation is very important to measuring error. In this paper, we have given the relations between the extinction coefficients KH, v and ZH, ZDR for different raindrop size distributions (DSD) at 5.6 cm wavelength. We have simulated and discussed the effects of variation of temperature, DSD , smoothing of data and radar's system errors on the results of correcting attenuation. The results show that the attenuation makes ZH, ZDR becoming less, if the measuring errors of ZH, ZDR is not large, and other elements have not more effects on correcting results. Attenuation correcting could improve the measuring accuracy significantly, but measuring errors of ZH, ZDR is very important for correcting problem.
出处
《高原气象》
CSCD
北大核心
1992年第3期235-240,共6页
Plateau Meteorology
关键词
雷达
偏振
雨
微波频率
衰减
模拟
Microwave attenuation
Variation of raindrop size distribution
Smoothing of radar data.
