辽西地区锋前暖区型冰雹天气过程雷达回波特征分析  

Radar Echo Characteristics Analysis on Prefrontal Warmer Zone Type Hail Weather Process in Western Liaoning Area

作　　者：毕明林 于跃[1] 李书君[1] 姚维华 刘鹏飞[1] 于芳健 薛洪光[1] 

机构地区：[1]辽宁省朝阳市气象局,辽宁朝阳122000

出　　处：《现代农业科技》2014年第23期258-262,共5页Modern Agricultural Science and Technology

摘　　要：利用常规观测资料、MICAPS资料和雷达资料,对2000—2012年5—9月辽西地区冰雹天气过程进行分型讨论,按照地面有无冷空气影响将冰雹类型分为锋后冰雹型、高压后部偏南气流冰雹型和锋前暖区冰雹型,并重点对锋前暖区冰雹型进行中小尺度和雷达资料的诊断分析。结果表明:华北地区低值系统东移南压配合低空切变线和地面冷锋的共同影响是此类冰雹的直接影响系统;对流层中低层大范围上冷下暖结构为此类冰雹提供不稳定层结条件;低层辐合配合高空急流轴南侧辐散产生明显上升运动;雷达回波特征分析显示,此类天气过程存在并维持尺度较小的中气旋结构。By using conventional observation data,MICAPS data and radar data,classification discussion of hail weather process in western Liaoning area from May to September during 2000 to 2012 was conducted. According to the cold air influence to the ground,the hail types can be divided into front after the hail type,high pressure at the back of the south airflow hail type and prefrontal warmer area hail type. Small and medium scale type prefrontal warmer area hail and radar data were mainly analyzed. The results showed that the common effect of the minimum system in north China east south press fit a low shear line and the ground cold front is the direct impact system of such hail. In the lower troposphere on a wide range of cold with warm structure made the hail with unstable stratification structure. Disturbance convergence with low-level jet stream axis sooth divergence produced significant upward movement. Radar echo characteristics analysis showed this kind of weather process exist and maintain scale smaller cyclone structure.

关 键 词：锋前暖区型 冰雹 天气过程 雷达回波特征 辽西地区 

分 类 号：P458.12[天文地球—大气科学及气象学]