In order to make up for the shortage of the measured data of ultraviolet radiation in China, this paper calculates and analyzes ultraviolet radiation under the standard atmosphere and cloudless conditions based on the SMARTS. The temporal and spatial variation characteristics of ultraviolet radiation multi-parameters are researched, such as the global ultraviolet radiation of Eg 280 nm-400 nm, UVA of 315 nm-400 nm, UVB of 280 nm-315 nm, ultraviolet index UVI, erythema effective ultraviolet radiation CIE, global ultraviolet irradiance on the vertical plane, and the quantitative influence of atmospheric turbidity, ozone content, altitude, surface albedo and other factors on each parameter. The results show that： 1） The parameters of UV radiation decrease with the increase of latitude, and the ratio of global UV radiation to the global radiation of the whole spectrum is about 5%. 2） The parameters of UV radiation are high in summer and low in winter, high in noon and low in morning and evening, and the annual variability of high latitude is higher than that of low latitude, and the parameters of UV radiation in middle and low latitude are similar in the three months before and after the Summer Solstice Day, which may have a great impact on human health. 3） UVI may be close to 11 at noon in summer when it is completely clear, and UVA and UVB may reach 70 W/m2 and 2 W/m2 at noon, respectively. The peak value of the global ultraviolet irradiance on the south vertical plane in low latitude area can reach 70 W/m2 in the Summer Solstice Day, which is equivalent to the value on the horizontal plane; 4） When the visibility increases from 2 km to 50 km, the ultraviolet irradiance will double; On the other hand, with the increase of visibility, the increase of UV irradiance is slowed down. When the total amount of ozone is doubled from 200 DU to 400 DU, the UVI decreases by more than half, and the decreasing range slowed down with the increase of total ozone. When the altitude increases from 0 to 5 km, the UV irradiance increases by about 1/4, and the increasing range remained relatively uniform with the increase of altitude. When the surface albedo doubles from 0.2 to 0.4, the UV radiation on the south vertical plane increases by 1/5, and the global UV radiation on the south vertical plane from the reflection of the ground are larger in summer, but smaller in winter. Although the above results are only the theoretical simulation results under cloudless conditions, the basic characteristics of UV radiation and influencing factors reflected in the results can still be used for reference in the fields of meteorology and medical science.
Key words
ultraviolet radiation /
multiple parameters /
influence factor /
numerical simulation /
SMARTS
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References
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