济南地区逆温层特征及其对颗粒物质量浓度的影响

Characteristics of Temperature Inversion in Jinan and Its Effect on Particulate Matter Mass Concentration

利用L波段探空雷达数据、温度廓线仪数据、微脉冲激光雷达边界层数据、PM2.5质量浓度数据,结合常规地面气象观测资料,分析济南2008—2017年逆温层参数特征以及逆温对PM2.5质量浓度的影响。结果表明,2008—2017年济南逆温发生频率为47.2%,且呈逐年下降趋势,气候倾向率为0.44%·a^-1。逆温频率、逆温强度和逆温层厚度在冬季较高,夏季较低,但不同类型逆温季节变化不同。济南地区贴地逆温平均厚度为134m,逆温强度为2.46℃·(100m)^-1;脱地逆温平均厚度为212m,逆温强度为1.34℃·(100m)^-1。逆温是影响空气质量的重要因子之一,逆温的存在导致济南近地面PM2.5质量浓度升高24.8%。PM2.5质量浓度与逆温层厚度呈显著正相关,而与逆温强度的相关性未通过显著性检验。

The paper analyzed the characteristics of temperature inversion and the impact of temperature inversion on PM 2.5 mass concentration in Jinan from 2008 to 2017 based on L-band radar data,temperature profiler data,micro-pulse laser radar data,PM 2.5 mass concentration data and conventional meteorological observation data.The frequency of temperature inversion was 47.2%,and it showed a decreasing trend year by year,with an annual decline rate of 0.44%.In general,the frequency of temperature inversion,temperature inversion intensity and thickness were higher in winter and lower in summer,but seasonal variations of different inversion types were different.The mean thickness of ground inversion was 134 m,and the intensity of ground inversion was 2.46°C·(100 m)^-1.The thickness of suspension inversion was 212 m,and the intensity of that was 1.34°C·(100 m)^-1.Temperature inversion was one of the important factor affecting air quality.The occurrence of temperature inversion led to a 24.8%increase in PM 2.5 mass concentration in Jinan.PM 2.5 mass concentration was significantly and positively correlated with the thickness of temperature inversion,while the correlation between PM 2.5 mass concentration and the intensity of temperature inversion did not pass the significance test.