相似路径台风“派比安”（2006）和“威马逊”（2014）前部飑线过程对比分析

摘要

Using convention observational data, radar data and NECP(1°×1°) reanalysis data, squall lines preceding of the Typhoon Prapiroon(0606) and Typhoon Rammason(1409) with similar tracks were contrastively analyzed. The results showed that the surface convergence line and boundary layer convergence system provided the necessary dynamic condition for the occurrence and development of pre-TC(Tropical cyclone) squall line, and continued strong southeast jet provided sufficient vapor and energy for it. The characteristic of low layer warm and high-level cold which had a large vertical temperature difference provided a favorable thermal instability condition for the formation of pre-TC squall line. And convection intensity would be strengthened by strong CAPE accumulation and release. The upper trough merged into the inverted typhoon trough was conductive to prolonging the life history of pre-TC squall line. Pre-TC squall line moved from area of weak vertical wind shear to area of relatively strong vertical wind shear was conductive to its organization and development. Strong vapor convergence in front of the pre-TC squall line was conductive to its development.%利用常规观测、雷达资料和NCEP 1°×1°再分析资料，对路径相似台风“派比安”（2006）和“威马逊”（2014）的前部飑线过程进行对比分析。结果表明，地面辐合线和边界层辐合系统为台前飑线的发生发展提供了必要的动力条件，持续强盛的东南急流提供了充足的水汽和能量输送。低层暖、高层冷且具有较大垂直温差的特征为台前飑线的形成提供了有利的热力不稳定条件，而强的CAPE积累和释放有利于对流强度的加强。高空槽并入台风倒槽有利于延长飑线的生命史。台前飑线从垂直风切变相对较弱的区域移入较强的区域有利于其组织和发展，反之则不利于其组织和维持。台前飑线移动路径前方存在水汽辐合有利于其发展，反之则不利于其维持。