【摘要】 利用飞机、雷达、卫星观测资料,对2014年5月1日08时—2日08时河北省一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:4 200~2 850 m为冷暖云结构,2 162~2 174 m为十几米厚的纯暖云,近地面层121~265 m有粒子浓度较低(量级为101cm-3)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3 100~4 000 m,对应的雷达回波强度为20~30 d Bz,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。更多还原

【Abstract】 Based on the data from plane,radar and satellite,the structure features of a rainfall in Hebei province during08: 00 May 1,2014 to 08: 00 May 2,2014 was studied.The results showed that the precipitation stratiform clouds in this weather process could approximately divided into 3 layers: 2 850—4 200 m was cold-warm cloud,2 162—2 174 m was pure warm cloud and 121—265 m in the surface layer was warm cloud with lowparticle concentration(101 cm-3).There existed obvious catalytic cloud-supply could structure before the precipitation.After the precipitation began,the higher cloud imposed catalysis effect on the lower cloud. The potential area of artificial precipitation stimulation mainly located in 3 100—4 000 m,where the intensity of corresponding radar echo was20-30 d Bz and the vertical gradient of its intensity is significantly reduced. The correlation analysis of the cloud microphysical parameters at different altitudes was analyzed.According to the results,the LWC and the cloud particle concentration showed strong negative correlation with the aerosol concentration at the cloud base.The coefficient between the IWC and the cloud particle concentration was 0. 434.The CCN concentration had strong positive correlation with the temperature(0. 717) in the cold cloud.更多还原