气象与环境学报2012，Vol.28Issue(4)：84-89,6.
一次下击暴流显著弓形回波特征
An analysis of a typical bow echo
摘要
Abstract
Based on the weather charts,satellite cloud images and the new generation weather radar data,a strong wind process on July 31,2007 was analyzed.The results indicate that the process is downburst but not tornadoes,and it is produced by the merger process of the bow echo and supercell.A bow echo moves from southwest to northeast during the night on July 30 to wee hours on July 31,2007,and it makes six districts and counties of Tianjin generating thunder shower and short-time rainstorm.The maximum precipitation intensity reaches 37.6 mm · h-1,while squall,hail and ground gale do not occur in six weather stations.By analyzing the radar data,it shows that the moving bow echo maintaining more than 5 hours merges with a pre-existing supercell in mountain area of Jixian and produces downburst.The weak echo region gap appears in the reflectivity factor chart.At the same time,the bow echo shape is changed and is disconnected above 2.4 ° elevation angle,whose echo intensity reaches 53 dBz.An obvious rear inflow jet occurs early and a mesoscale cyclone generates late companied with the middle and low divergence on the relative radial velocity chart.The strong anti-cyclone features occur in upper level.The height of the storm development is high,and the height of echo top is over 15 km.The nucleus of reflectivity factor drops 3 km rapidly with the occurrence of downburst.关键词
龙卷/弓形回波/超级单体/下击暴流Key words
Tornado/Bow echo/Supercell/Downburst分类
天文与地球科学引用本文复制引用
李胜山,张殿江,胡玲,吴强,于莉莉..一次下击暴流显著弓形回波特征[J].气象与环境学报,2012,28(4):84-89,6.基金项目
中国气象局关键技术集成与应用（面上）项目 （）
中国气象局北京城市气象研究所基金（UMRF201008）共同资助 （）
