Ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) instruments were used to carry out observation of aerosol in the urban and suburban areas of Shanghai from October 17 to November 21, 2019. Fudan University (FDU) site is a typical urban environment, surrounded by residential areas, commercial areas and arterial roads, while Dianshan Lake (DSL) site is a suburban environment with high vegetation coverage and no pollutant emission sources. The aerosol retrieved by MAX-DOAS was in good correlation with the observation of sun photometer and the PM_2.5 concentration of the corresponding site, which demonstrates that the aerosol retrieved by MAX-DOAS is reliable and feasible. Comparing the mean aerosol extinction coefficient (AEC) profiles during the observation period between urban and suburban areas, it was found that the occurrence of high aerosol concentration at FDU was nearly 3 h later than that of DSL at suburban site. And the aerosol at DSL was concentrated at an altitude of 0.3– 0.5 km, with a mean peak value of 0.486 km⁻¹, which was slightly higher than the peak AEC of 0.453 km⁻¹ at FDU of 0.2– 0.4 km. The difference in aerosol characteristics between the two sites may be due to the fact that the influences of aerosol transport and boundary layer dynamics are different between the two sites. The backward trajectories analysis also presents that there were mutual transports of aerosol between urban and suburban areas, which affect the optical properties of the aerosol in these two sites. In a case of aerosol pollution, we visualized the transport pathway of aerosol from the western part of the North China Plain to Shanghai using AEC profiles and backward trajectories, providing the evidence that the local aerosol pollution in Shanghai was affected by long-distance transport.

2019年10月17日至11月21日，利用地基多轴差分光吸收光谱（MAX-DOAS）仪器对上海城区和郊区的气溶胶进行观测。复旦大学（FDU）站点是典型的城市环境，周边为居民区、商业区和主干道，而淀山湖（DSL）站点是郊区环境，植被覆盖率高，无污染物排放源。MAX-DOAS 反演的气溶胶与太阳光度计观测值和 PM _2.5具有良好的相关性相应位点的浓度，表明 MAX-DOAS 反演的气溶胶是可靠可行的。比较城市和郊区观测期间的平均气溶胶消光系数（AEC）剖面，发现FDU高气溶胶浓度的发生比郊区DSL晚近3小时。和在DSL气溶胶浓缩以0.3-0.5公里的高度，具有0.486公里的平均峰值^-1，比的0.453公里峰值AEC略高^-1在 0.2-0.4 公里的 FDU。两个站点之间气溶胶特征的差异可能是由于两个站点之间气溶胶传输和边界层动力学的影响不同。后向轨迹分析还表明，城市和郊区之间存在气溶胶的相互传输，这影响了这两个站点的气溶胶光学特性。在气溶胶污染的情况下，我们利用AEC剖面和后向轨迹可视化了华北平原西部到上海的气溶胶传输路径，提供了上海局部气溶胶污染受长距离传输影响的证据。