摘要
在瑞利散射、液态水介电常数模型、雾滴谱分布基础上,分析了单个云雾粒子和群雾滴的电磁传输特性.数值模拟计算表明,电长度是影响云雾粒子电磁传输特性的主要因素,温度的影响相对较小.平流雾分布的电磁传输特性强于辐射雾的传输特性,影响群雾滴传输特性的因素由大到小依次为人射波频率、含水量和温度.所得结论对提高降水测量的精度,减小卫星通信的误差具有重要的意义.
Abstract
Based on the airborne observation data obtained by the Particle Measuring System (PMS) in Sichuan Province on 24 October 2008, the characteristics of the autumn low-level warm clouds without ground precipitation are discussed. The results show that: (1) The low-level warm clouds were composed mainly of small cloud droplets, and the number concentration of large cloud droplets was relatively low, and the precipitation particles in the clouds were very few. (2) The liquid water content, number concentration and diameter of small cloud droplets were inhomogeneous in horizontal direction. (3) There was a positive correlation between the liquid water content and the mean diameter of small cloud droplets. (4) Compared with the upper layer of the clouds, there were less small cloud droplets and large cloud droplets (small raindrops) and fewer large raindrops in the cloud base. (5) Because of the small cloud liquid water content, thin cloud thickness, difficult condensation growth of cloud droplets, inactive coalescence growth, and short path and time of collision growth, there was no precipitation reaching the ground.
NETL
NSTL
维普
万方数据