Silva Abel A, Gabrich Lívia L P
Laboratório de Luz Ultravioleta, Departamento de Física e Química, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, MG, Brazil.
Photochem Photobiol. 2007 Sep-Oct;83(5):1197-204. doi: 10.1111/j.1751-1097.2007.00135.x.
The ultraviolet radiation (UVR) emitted by the Sun causes many effects on the biosphere. On human beings they vary from the benefit of vitamin D synthesis to the harm of skin cancer induction. The biological dose depends on the effect, the exposure time to the Sun and the amount of UVR received. In this work we show that the measured incidence of erythemal dose (ED) in Belo Horizonte (19.92 degrees S, 43.94 degrees W, 858 m a.s.l., Brazil) for a cloudless day can vary from 7503 to 2926 J m(-2) in the summer-winter seasonal variation. In addition, supposing a linear relationship between the ED and the geophysical parameters of solar zenith angle cosine (cos(SZA)), column ozone and reflectivity from the ozone monitoring instrument overpass measurements, a model for the forecast of UVR incidence on a monthly-based period is developed. From this an annual ED of 1,451,099 J m(-2) is obtained.
太阳发出的紫外线辐射（UVR）对生物圈产生诸多影响。对人类而言，这些影响从维生素D合成的益处到引发皮肤癌的危害各不相同。生物剂量取决于所产生的影响、日照时间以及接收的紫外线辐射量。在这项研究中，我们表明，在巴西贝洛奥里藏特（南纬19.92度，西经43.94度，海拔858米），无云天气下测得的红斑剂量（ED）在冬夏季节变化中可在7503至2926焦耳每平方米（J m⁻²）之间变动。此外，假设红斑剂量与太阳天顶角余弦（cos(SZA)）、柱臭氧以及臭氧监测仪过境测量的反射率等地球物理参数之间存在线性关系，我们建立了一个基于月度周期的紫外线辐射发生率预测模型。据此得出的年度红斑剂量为1,451,099焦耳每平方米（J m⁻²）。
