华北平原飑线与一般对流活动发生条件的对比分析

本文根据1986年6、7月影响华北平原北部的4次飑线过程,分析了飑线发生的天气形势,对比分析了飑线与一般对流活动的发生条件。分析结果表明,华北飑线的发生与中层冷空气爆发相关,飑线发生前华北平原的不稳定能量分布具有高值、集中分布和正增长的特点。这些分析结果可能有助于华北地区飑线的分析和预报。

Analysis of occurrence of squall line and commonly convective activity over North China

In this paper, based on 4 squall line processes occured over North China during 6-7, 1986,the synoptic situations of occurrence of squall line are analysed, and have been compared with commonly convective activity. It is found that the occurrence of squall line is related to the cold air breakout in the middle levels.Before its occurrence,. the unstable energy are characteristic of larger, concentrative distribution and increased with time. Some significant results could be useful for analysing and forecasting the occurrence of squall line.