宁波栎社机场一次长时间雷雨过程分析

Analysis of a Long-duration Thunderstorm Process at Ningbo Lishe Airport

利用机场常规观测数据、NCEP/NCAR再分析资料、MICAPS资料以及雷达反射率资料等,对2016年6月28-29日宁波栎社机场的一次长时间雷雨过程进行分析。结果表明:中高纬度存在阻塞环流,中低纬度西风槽缓慢东移,低层暖湿气流持续输送是导致此次雷雨生成并长时间维持的环流背景。雷暴过程基本可分为系统性雷暴前沿被激发的局地热雷暴和系统性雷暴两个阶段。雷暴期间低层水汽通量值均在12g/(cm·hPa·s)以上;0-6km风切变值为3.7×10^(-3)s^(-1),达到强风切变级别;高空辐散远大于低层辐合,上升运动显著。

Based on the conventional observation data of the airport, NCEP/NCAR reanalysis data, MICAPS meteorological observations and radar data, a long-duration thunderstorm process at Ningbo Lishe Airport on 28-29th June, 2016 is analyzed. Results show that, there is a blocking high in the middle and high latitudes, a slowly-moving westerly trough in the middle and low latitudes, and continuous warm and wet airflow in the low layer. These are the backgrounds which result in the for mation and duration of the thunderstorm. The whole process can be divided into two stages: local thermal thunderstorm triggered by the frontier of systematic thunderstorm and systematic thunderstorm. The low- layer water vapor flux is larger than 12g/(cm*hPa*s) throughout the whole process. The vertical wind shear between 0-6km is 3.7x10'3s_1, reaching the level of strong wind shear. And the upper divergence is much greater than the lower convergence, so the upward movement is quite strong.