广州市地面太阳紫外线辐射观测和初步分析

通过对广州市2000～2001年两年的地面紫外线辐射观测资料的分析表明广州市全年紫外线辐射强度84.3%出现在"中等"以上级别,"强"、"很强"级别占65.1%,尤其是第二、三季度分别有46.2%、62.1%的时间紫外线出现"很强"级别,分析表明广州市属于紫外线高辐射地区;各候(旬)的最小紫外线指数在夏秋季节的涨落脉动比冬春季节要大,尤其是秋季更加明显.另外,定义了每月云衰减因子(CAF),12～4月为明显的云衰减加强期;6～9月为明显的云衰减减弱期,分析期间最大云衰减因子仅为0.11.

THE OBSERVATION OF SURFACE SOLAR ULTRAVIOLET IN GUANGZHOU AND ITS PRELIMINARY ANALYSIS

The analyses of observed data of surface solar ultraviolet from year 2000 to 2001 in Guangzhou reveal that the all-year-round ultraviolet radiance intensity is about 84.3% above the moderate?level, while 65.1% is at the high and very high?levels combined, especially in the second and third quarters when there are 46.2% and 62.1% respectively of time in which the ultraviolet radiance intensity is at the very high?level. The results show that Guangzhou City falls in a region of high ultraviolet radiance. The distribution of minimum ultraviolet index of five-day (ten-day) periods has larger change in summer and autumn, especially in autumn than that in spring and winter. In addition, a monthly cloud attenuation factor (CAF) is defined, the analyses show that obvious cloud attenuation intensifies from December to April, while obvious cloud attenuation weakens from June to September, with the largest attenuation factor in the analysis period being only 0.11.