广州地区紫外辐射特征和模式对比分析

Observational characteristics of ultraviolet radiation in Guangzhou and its comparison with model results

根据中国气象局广州热带海洋气象研究所的紫外观测数据，研究了广州的紫外辐射季节变化，结果表明，2005年和2006年广州各月份紫外辐射强度的极值的最大值都出现在7月，2006年的达到了55．48W／m2，极值的最小值也都出现在1月，2005年最小只有23．17W／m2,利用NCAR（美国大气研究中心）的TUV模式，模拟研究了2005年11月16-29日一次从清洁到灰霾过程的典型个例，模拟的结果与实际观测基本一致，模式研究表明，在污染较轻时，TUV模式能够很好的模拟晴天紫外辐射的日变化，模式与实测之间有约7％-05％的误差．随着污染的加剧，模式的偏差也变大．气溶胶对紫外辐射的影响相当大，在气溶胶污染严重时可使紫外辐射降低40％，气溶胶对紫外辐射的短波谱也有较大的影响，随着污染的加重，对紫外辐射的短波衰减会加强。

This paper analyzed the seasonal variations of ultraviolet radiation in Guangzhou, based on the ultraviolet radiation observation by the Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou. The peak of the monthly maximum of ultraviolet radiation appeared in July, both of 2005 and 2006, with 55.48 W/m2 in 2006, The minimum of the monthly maximum of ultraviolet radiation appeared in January, was only 23.17 W/m2 in 2005. The influence of haze on ultraviolet radiation in Guangzhou was conducted by using NCAR（National Center for Atmospheric Research） TUV model for a typical case from extremely clean to haze from 16th to 29th, November, 2005, indicating that the model results were consistent with the actual observations. When the pollution was not serious, TUV model could simulate the dally variation well in sunny day with a residual about from 7% to 15% between modeled and observed results. As the pollution was intensified, the residual of the model increased as well. Aerosol had a strong impact on ultraviolet radiation, which could be reduced by 40% when the aerosol pollution was extremely serious. Besides, aerosol could affect on the shorter spectrum of ultraviolet radiation as well. With the pollution intensified, the effect on the shorter spectrum of ultraviolet radiation was strengthened.