摘要
对北京地区臭氧层损耗和气溶胶污染对紫外辐射量变化的影响进行了计算。结果表明,当臭氧总量减少1%-30%时,UV-B对DNA危害效应的辐射放大因子(RAF)从2.3增加到4.2。城区和乡村环境的气溶胶污染使UV-B日辐射总量分别降低45%和10%。如果仅考虑臭氧总量的变化,1980—1989年间UV-B辐射量年变化率为1.4%,当考虑气溶胶因素的变化后,UV-B辐射量年变化率为-0.7%,这与实际观测的结果相符合。
Ozone layer depletion and aerosol pollution have aninfluence on the solar ultraviolet radistion reachingthe ground. A compunction indianaes that theradiation amplification factor (RAF) for a DNAdamage varies from 2. 3 to 4. 2 when a reduction incolumn ozone goes from 1% to 30%. Since theindustrial revolution, the daily UV-B radiation inurban and rural areas has decreaSed by about 45%and 10%, respeCtively, that Can be attributed toaerosol pollution. The computed UV-B radiation dueto the ozone reduction in Beijing shows an increasingtrend at an average annual rate of 1.4% during thePeriod of from 1980 to 1989. By taking thevariations in atmospheric aerosol concentration intoaccount,the computed UV-B radiation shows a trendof negstive shift at an annual rate of 0.7%. Thesevariations in UV-B radiation are found to be close tothose measured in the Alpine regions(47°N) and theUnited States (30-50°N).
出处
《环境科学》
CAS
CSSCI
CSCD
北大核心
1994年第2期41-44,共4页
Environmental Science
关键词
臭氧层
气溶胶
紫外辐射
UV-B radiation, ozone layer, aerosolpollution.