摘要
对2004—2014年普洱市多普勒天气雷达观测到的28次飑线过程进行基础数据分析,并对比分析雷达产品.结果表明：滇西南飑线主要发生在3—9月,平均生命史约为3.6 h,82%的初生时段集中在14：00—22：00;飑线路径共有5条,1和4型飑线雷暴单体强度明显大于2、3和5型飑线,后者单体消亡后形成宽广的层状云降水回波,在8-10 km高度层＂零度层亮带＂呈现不规则状;径向速度存在模糊区、逆风区、中层径向幅合（MARC）、中气旋、回波墙、云顶上冲、穹窿和有界弱回波区（BWER）等特征的出现有利于雷暴单体的加强和飑线的维持;飑线前新生单体强度的增减在一定程度上预示着飑线的加强或消亡;飑线降雹过程主要出现在第1类型飑线中,垂直累积液态含水量（VIL）在49-76 kg·m-2时,降雹几率最大.
This article is based on the inversion of 28 squall line process observed by the doppler radar from2004—2014 in Pu ＇er. By analyzing the comparison of radar products,we have several conclusions. Most of the squall line process happens from Mar to Sep,the average life of them is about 3.6 h,82% of them generated on14： 00—22： 00 pm.There are five paths of the squall line process,and the type 1 and type 4 squall line thunderstorm cell is stronger than type 2,type 3 and type 5.When the monomer of type 2,type 3 and type 5 die out,there will be a broad stratiform precipitation echo existing in the ＂zero layer bright band＂at 8—10 km,and their shape is irregular.The characteristic such as the fuzzy radial velocity of the squall line,the BWER in adverse wind area,MARC,cyclone,echo wall,genting on,groin,is conducive to the strengthening of thunderstorm cell and squall line maintenance. The intension increase or decrease of the new monomer before the squall line indicates the strengthen or subduction of the squall line. Hail process always happens in the squall line of type 1,especially when the VIL is about 49—76 kg·m-2.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第1期81-89,共9页
Journal of Yunnan University(Natural Sciences Edition)
基金
云南省普洱市气象局科技创新专项(PE201502)
