In this study, a revised CMAQ model incorporating source and temporal apportioning functions has been used to analyze the aging characteristics of SOA in East Asia. The results show that in the aerosol phase, the fraction of the non-volatile components typically fluctuates around 75 %–95 %, and aromatic hydrocarbon precursors contribute significantly to SOA, accounting for 45.6 %–72.7 % in winter and 29.1 %–52.7 % in summer. Transport due to meteorological conditions does not affect the SOA volatility profile in the cities, while regional source composition has been found to be important for the characterization of the properties of SOA in cities. When the SOA regional composition type is a multi-region-imported-dominated type (MRT), its age composition type tends to be an old-age-SOA-dominated type (OAT) (>48 h). Additionally, transport also causes fluctuations in the range of hourly SOA with atmospheric age of 96 h or higher. The SOAs normally transport through seasonal monsoon and could migrate longer in winter (700-1500 km in January) than in other seasons (250-900 km in April; 500-1200 km in July; 300-1000 km in October). Additionally, in winter, non-volatile SOA generally has a longer transport distance (700-1600 km) than semi- and low-volatile SOA (300-1300 km and 600-1500 km). Furthermore, during the transport process, geographical barriers have negligible impact on SOA in the 48+ hour age group.

在本研究中，结合源和时间分配函数的修订后的 CMAQ 模型已用于分析东亚 SOA 的老化特征。结果表明，在气溶胶相中，非挥发性组分的比例通常在75%~95%之间波动，芳香烃前体对SOA贡献显着，冬季占45.6%~72.7%，冬季占29.1%~52.7%。在夏天。气象条件引起的交通不会影响城市中的 SOA 波动剖面，而区域源组成对于表征城市中 SOA 的特性非常重要。当SOA区域构成类型为多区域输入主导型（MRT）时，其年龄构成类型趋向于老年SOA主导型（OAT）（>48小时）。此外，运输还会导致每小时 SOA 范围的波动，大气年龄为 96 小时或更高。SOA通常通过季节性季风进行运输，冬季的迁移时间（1月为700-1500公里）比其他季节（4月为250-900公里；7月为500-1200公里；10月为300-1000公里）迁移时间更长。此外，在冬季，非挥发性SOA通常比半挥发性和低挥发性SOA（300-1300公里和600-1500公里）具有更长的传输距离（700-1600公里）。此外，在运输过程中，地理障碍对48小时以上年龄组的SOA影响可以忽略不计。