廊坊北部夏季人工增雨潜力分析

Analysis on Artificial Precipitation Potentiality in North Langfang in Summer

经过对6～9月份廊坊市历史气象资料的普查与统计分析发现,700 hPa天气图上的低涡、切变线、低槽和地面天气图上的冷锋是出现频率较高且可带来对流性天气的主要影响系统,当其中的某个系统出现时,该地区有50%以上的日数会出现雷暴和较明显降水,或出现云量大于4的积雨云,成为人工增雨作业潜力日,因此,正确识别上述系统是指导人工增雨作业的重要环节。笔者对该影响系统的位置、范围等进行了宏观描述,以期抓住适当时机开展人工增雨作业,提高增雨效率。

Based on census and statistical analysis of historical weather data in Langfang City during June-September,we found that the low vortex,shear line and low trough on 700 hPa weather map and cold front on surface weather chart occur in higher frequency and are main influence systems which can bring convective weather.When some of the systems occur,more than 50% of the days in the district may experience thunderstorms and obvious precipitation,or generate the cumulonimbus clouds and when cloud cover are greater than 4,that days become the potential precipitation days.Therefore,to identify the systems above correctly is the most crucial part of guiding the artificial precipitation.In this paper,we will describe the locations and the scopes about the systems above from the macroscopic perspectives to seize the appropriate opportunities for artificial precipitation and improve the efficiency.