中文摘要：

紫外变细由于在广州的大气的喷雾器是用表面估计的份量上紫外放射(紫外， 295385 nm ) 观察，阳光光度计和放射当模特儿。观察证明年度一般水准喷雾器珍视光深度( AOD )是 1.19 在紫外光谱 340 nm 的区域，喷雾器的年度平均出现频率光深度 AOD340 nm > 1.0 是55%，并且表面的年度平均变细率 340 nm 的紫外直接放射是68%。它在表面的观察被证明紫外放射和模型评估年度平均变细由于空气紫外是 75% ，并且那在旱季(10 月， 11 月， 12 月和 1 月) 到达了 72% ；当时平均变细由于大气的喷雾器紫外在旱季到达了 62% 。很重要的紫外变细在广州城市的凝块由于大气的喷雾器存在，这被显示，并且紫外放射的至少一半由于大气的喷雾器被稀释。如此的大振幅的变细将在城市的生态系统和种类化学药品周期上有重要影响，特别光化学的反应过程。

英文摘要：

The UV attenuation due to atmospheric aerosols in Guangzhou was quantitatively assessed using surface ultraviolet radiation （UV,295-385 nm） observation,sun photometer and radiation models.Observations showed that the annual average value of aerosol optical depth （AOD） was 1.19 in UV spectral region of 340 nm,the annual average occurrence frequency of aerosol optical depth AOD 340 nm 〉1.0 was 55%,and the annual average attenuation rate of surface UV direct radiation of 340 nm was 68%.It was proven in the observation of surface UV radiation and model evaluation that annual average attenuation of UV due to atmosphere was 75%,and that reached 72% in the dry season （October,November,December and January）;while average attenuation of UV due to atmospheric aerosols reached 62% in the dry season.It was indicated that very significant UV attenuations due to atmospheric aerosols existed in Guangzhou urban agglomeration,and at least half of UV radiation was attenuated due to atmospheric aerosols.Such large-amplitude attenuation will have a significant impact on urban ecosystem and species chemical cycles,especially photochemical reaction processes.