Abstract

GRIMM aerosol spectrometer measurements of mass concentrations of PM1, PM2.5, and PM10 near St. Petersburg (Russia) in 2016–2018 are analyzed. The average concentrations of PM1, PM2.5, and PM10 over the measurement period are 4.5, 4.8, and 4.9 μg/m³, respectively. The hourly average PM10 concentrations are compared with the aerosol optical thickness at a wavelength of 500 nm (AOT) for different seasons. The correlation between the PM10 concentration and AOT is found to be the strongest in autumn. According to the distribution of the wind directions, the maximal PM10 concentrations correspond to the eastern winds (from St. Petersburg). The seasonal dependence of the daily variation in the mass concentration of PM10 on the relative air humidity and the height of the atmospheric boundary layer is analyzed. The PM10 concentrations (~8 μg/m³ on the average) and the amplitude of their daily variations are maximal in winter.

中文翻译：

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圣彼得堡附近气溶胶颗粒浓度的季节性和每日变化

摘要

分析了GRIMM气溶胶光谱仪在2016-2018年圣彼得堡（俄罗斯）附近PM1，PM2.5和PM10的质量浓度。测量期间PM1，PM2.5和PM10的平均浓度为4.5、4.8和4.9μg/ m ³， 分别。将不同季节的每小时平均PM10浓度与波长为500 nm（AOT）的气溶胶光学厚度进行比较。秋季PM10浓度与AOT之间的相关性最强。根据风向的分布，最大PM10浓度对应于东部风（来自圣彼得堡）。分析了PM10质量浓度每日变化对相对空气湿度和大气边界层高度的季节依赖性。在冬季，PM10浓度（平均约为8μg/ m ³）及其每日变化幅度最大。