摘要
一、前言太阳光通过大气层时经过了各种影响因素的衰减后到达地面,其中臭氧分子吸收,气溶胶粒子吸收和散射的影响作用最为主要.当臭氧浓度或气溶胶粒子浓度改变时,到达地面的太阳紫外辐射量将改变.据观测,近二十年来,全球范围内臭氧总量已普遍减少了1％—3％.臭氧浓度的降低增加了地面紫外线B辐射(UV-B,280—320nm),从而将给地球生物带来一定的危害作用.尽管臭氧浓度减少对地面UV-B辐射增加的作用很大。
The light absorption and scattering of atmospheric aerosol can reduce the intensity of solar ultraviolet radiation reaching the ground. Model computation indicates that aerosol pollution in urban and rural area have decreased the annual amounts of UV-B radiation at the earth's surface by 45% and 10%, respectively. The decreased amounts of UV-B radiation caused by aerosol scattering may offset the increasing amounts of UV-B radiation due to the depletion of ozone layer.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1993年第4期498-502,共5页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目
关键词
气溶胶
污染
紫外辐射
臭氧层
aerosol pollution ultraviolet radiation, ozone layer.
