一次降水性层状云结构及微物理量相关性分析
投稿时间: 2017-02-16  最后修改时间: 2017-04-27  点此下载全文
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作者单位E-mail
杨文霞 河北省人工影响天气办公室 ywx418@163.com 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);河北省重点研发计划项目
中文摘要:2014年5月1日08时~2日08时,河北省受高空槽-地面冷锋天气过程影响,被大范围层状云覆盖,自西北向东南出现降水,5月1日15:32—18:26河北省人工影响天气办公室在冀西北地区实施增雨探测飞行一架次,本文利用飞机、雷达、卫星观测资料对本次降水性层状云结构特征进行综合观测分析,结果表明本次过程降水云大致分为3层:4200~2850m为冷暖云结构,2162~2174m为十几米厚的纯暖云,近地面层121~265m有粒子浓度较低(几十个/cm3)的暖云,降水开始前存在较明显的“催化云~供给云”结构,降水开始后高层对低层有催化作用;人工增雨潜力区主要位于3100~4000m,对应的雷达回波强度为20~30dBz,且雷达回波强度垂直梯度明显变小;对不同高度的云微物理量进行相关性分析,结果表明:云底的液态水含量和云滴浓度与气溶胶浓度具有较强的负相关,过冷水含量与云滴浓度相关性达到0.434,云凝结核浓度在冷云中与温度相关性较强,相关系数达到0.717。
中文关键词:降水性层状云 微物理结构 相关性
 
A study on the microphysical structure and the correlation of microphysical parameters of the precipitous stratiform cloud
Abstract:From 08 on May 1st, 2014 to 2nd at 08, Hebei province, due to the effect of upper through-ground weather process, was covered by a large range of stratifrom clouds, has appeared precipitation from northwest to southeast. At 15:32-18:26 on May 1st, Weather Modification Office of Hebei Province implemented rain enhancement detection flight once at Northwest Hebei. This paper will use the airborne observation data, radar monitoring data, and satellite monitoring data to comprehensively analyse the precipitation mechanism and artificial precipitation potential of the precipitous stratifrom clouds. According to the results, the precipitous stratiform clouds of this weather process is approximately divided into 3 layers: 2646-4200m is cold-warm cloud, 2162-2174m is over decade meters pure warm cloud. 121-265m in the surface layer has warm cloud with low particle concentration (/cm3), existing obvious “seeder-feeder cloud” structure before precipitation,the ice particles droped from the higher cloud seeding to the lower cloud after precipitation . The potential area of artificial precipitation stimulation mainly located in 3100-4000m, the intensity of corresponding radar echo is 20-30dBz,where the vertical gradient of the intensity of radar echo is significantly reduced. The correlation analysis of the cloud microphysical parameters at different altitude is analysed. According to the results, the LWC and the cloud particle concentration have strongly negative correlation with the aerosol concentration at the cloud base, the correlation of the IWC with the cloud particle concentration is 0.434,the CCN concentration has strongly positive correlation with the temperature (0.717)in the cold cloud.
keywords:precipitous stratiform cloud microphysical structure correlation
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