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Characteristics of aerosol particle size distributions in urban Lanzhou, north-western China

机译：中国西北部兰州兰州气溶胶粒度分布的特征

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Continuous particle size data (0.5-20μm) were collected using aerodynamic particle sizer (TSI 3321) at an urban site in Lanzhou, north western China from 1st August to 31~(st) October. Variations of particle concentrations and general characteristics of particle size distributions were analyzed. The hourly averaged particle number, surface area and volume concentration are 108.1±92.2cm~(-3),282.9±267.9μm~2cm~(-3) and 92.2±127.3ug~3m~(-3), respectively. Fine particles (0.5-2.5μrn) accounted for 98.7%, 73.8% and 37.5% of the total particle number, surface area and volume concentrations in 0.5-20μm, respectively. The size distribution of number concentrations is unimodal with a maximum at 0.54-0.58um, while that of the surface area and volume concentrations are bimodal. The main peak of surface area concentration appears near 0.63-0.67μm with a secondary peak at 3.79-4.07μm, and the main peak of volume concentration is at 4.7-5.1μm with a secondary peak near 0.67-0.72μm. K-means cluster analysis was used to group the particle volume size distributions into 7 clusters by their dominant mode and average concentration. Particle volume size distributions observed during dust storms and under dry and clear weather conditions were characterized by a single coarse mode, while particle volume size distributions affected by fog, smog and traffic related emissions were bimodal with peaks at accumulation mode and coarse mode, respectively.
机译：使用8月1日至31〜（St）10月1日至31〜（ST）在中国兰州市兰州市区的空气动力学粒子Sizer（TSI 3321）收集连续粒度数据（0.5-20μm）。分析了颗粒浓度和粒度分布的一般特征的变化。每小时平均粒子数，表面积和体积浓度为108.1±92.2cm〜（-3），282.9±267.9μm〜2cm〜（-3）和92.2±127.3μg〜3m〜（-3）。细颗粒（0.5-2.5μLN）分别占0.5-20μm的总粒子数，表面积和体积浓度的98.7％，73.8％和37.5％。数量浓度的尺寸分布是单峰的，最大在0.54-0.58um，而表面积和体积浓度的尺寸是双峰的。表面积浓度的主要峰值出现在0.63-0.67μm附近，二次峰值为3.79-4.07μm，体积浓度的主要峰值为4.7-5.1μm，二次峰值接近0.67-0.72μm。 K-means集群分析用于通过它们的主导模式和平均浓度将粒度大小分布分组为7个簇。在灰尘风暴期间观察到的粒子体积尺寸分布在干燥和晴朗的天气条件下，以单一的粗糙模式为特征，而受雾，烟雾和交通相关排放影响的粒度尺寸分布分别在累积模式和粗模式下具有峰值的双峰。

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