Attenuation of ultraviolet radiation reaching the surface due to atmospheric aerosols in Guangzhou  

作　　者：DENG XueJiao ZHOU XiuJi TIE XueXi WU Dui LI Fei TAN HaoBo DENG Tao 

机构地区：[1]Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510080,China [2]Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081,China [3]National Center for Atmospheric Research,Boulder,CO 80307,USA

出　　处：《Chinese Science Bulletin》2012年第21期2759-2766,共8页

基　　金：supported by the National Natural Science Foundation of China(41175117,40875090and40375002);the National Basic Research Program(2011CB403403);the Science and Technology Foundation of Guangdong Province(2010A030200012);the Science and Technology Innovation Team Plan of Guangdong Meteorological Bureau(201103)

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.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.

关 键 词：紫外线辐射 大气气溶胶 辐射衰减 表面 广州 气溶胶光学厚度 城市生态系统 化学反应过程 

分 类 号：P422.62[天文地球—大气科学及气象学]