回流天气系统层状云的非均匀性  

Inhomogeneity of Stratiform Clouds in Returning Weather Processes

作　　者：杨文霞 牛生杰[2] 魏俊国 孙玉稳 

机构地区：[1]河北省气象局人工影响天气办公室,石家庄050021 [2]南京信息工程大学中美合作遥感中心,南京210044 [3]河北省气象台,石家庄050021

出　　处：《气象科技》2005年第3期256-259,共4页Meteorological Science and Technology

基　　金：国家自然科学基金项目(40175003)资助

摘　　要：利用一次回流天气过程的PMS资料,从微物理结构上对回流天气系统层状云的不均匀性进行了分析,发现飞机在进入较强降水云带时,云物理量(液水含量、云滴浓度、云滴平均直径,温度)等会产生剧烈变化,表现为液水含量跃增、云滴浓度快速增大、云滴谱谱宽拓宽、温度下降等,在同一较强云带中,温度变化不大并且比周围低,较强降水云带冰晶含量丰富,自然催化较好。Based on the PMS data obtained during a returning process, the inhomogeneity of stratiform clouds in returning processes was analyzed from the aspect of microphysical structure. It is found that when the aircraft flies into stronger precipitating cloud bands, the main cloud physical parameters (liquid water content, particle mean diameter and concentration, and temperature) change greatly; the liquid water content, the mean diameter and the particle concentration leap up; spectrum width becomes wider; temperature drops; and so on. In the stronger cloud band, temperature variation is smaller and meanwhile temperature is lower. The stronger precipitating cloud bands have abundant ice crystals, indicating better natural seeding potential.

关 键 词：天气系统 层状云 非均匀性 回流 液水含量 微物理结构 天气过程 不均匀性 平均直径 温度变化 强降水 PMS 云带 物理量 云滴谱 浓度 冰晶 

分 类 号：P458.121[天文地球—大气科学及气象学] P48