济南市低空逆温特征及其对空气质量影响分析

Characteristics of Low-level Temperature Inversion in Jinan and Its Effect on Air Quality

利用2010—2018年济南章丘站逐日08:00和20:00 L波段雷达探空数据,统计分析了济南市低空逆温变化特征,并初步分析了逆温与空气质量的关系。结果表明:(1)2010—2018年济南市低空逆温发生频率为74.4%,20:00发生频率略高于08:00,夏季发生频率最低,冬季最高;低空呈现多层逆温共存的廓线形态,多出现1~3层逆温,极少出现4~5层逆温。(2)逆温厚度平均为147.4 m,主要分布在40~290 m;逆温温差平均为2.2℃,主要分布在4.5℃以下;逆温强度平均为1.8℃/100 m,主要分布在0.4~3.0℃/100 m。(3)污染越严重,逆温层数越多,逆温层越低,逆温越厚,逆温温差越大。

Based on the on L-band radar data of Jinan Zhangqiu station at 08:00 and 20:00 every day from 2010 to 2018,the characteristics of low-level inversion in Jinan were statistically analyzed,and the relationship between temperature inversion and air quality is preliminarily analyzed.The results show that:(1)From 2010 to 2018,the frequency of low-level inversion in Jinan was 74.4%,which was slightly higher at 20:00than at 08:00,the lowest in summer and the highest in winter;The low altitude presents the contour shape of coexistence of multilayer inversion,with 1~3 layers of inversion mostly,and 4~5 layers of inversion rarely.(2)The average thickness of temperature inversion was 147.4 m,mainly distributed in 40~290 m;The average temperature difference of temperature inversion was 2.2℃,mainly below 4.5℃.The average intensity of temperature inversion was 1.8℃/100 m,mainly distributed at 0.4~3.0℃/100 m.(3)The more serious the pollution,the more inversion layers,the lower the inversion layer,the thicker the inversion,and the greater the inversion temperature difference.