Turnbull D J, Parisi A V, Sabburg J
Centre for Astronomy, Solar Radiation and Climate, University of Southern Queensland, Toowoomba, QLD, Australia.
Photochem Photobiol. 2003 Aug;78(2):180-3. doi: 10.1562/0031-8655(2003)078<0180:subpss>2.0.co;2.
Broadband field measurements were conducted beneath three different-sized public shade structures, small, medium and large, during winter in the Southern Hemisphere. These measurements were compared with the diffuse UV to quantify the relationship of the UV under and around the shade structures to the diffuse UV. For the shade structures, a relationship between the diffuse UV and the UV in the shade has been provided for clear skies and solar zenith angles (SZA) of 49-76 degrees. This allows the prediction of the UV in the shade of these structures if the diffuse UV is known. The ultraviolet protection factors for the three shade structures ranged from 1.5 to 5.4 for decreasing SZA. For the greater SZA of 70-76 degrees, the erythemal UV in the shade was 65%, 59% and 51% of that in full sun for the small, medium and large structures, respectively. For the smaller SZA of 50-53 degrees the erythemal UV in the shade was 35%, 41% and 18% for the small, medium and large shade structures, respectively. From this research it can be concluded that the UV radiation levels in the shade in winter could cause erythema and other sun-related disorders.
在南半球冬季，于三种不同尺寸（小、中、大）的公共遮阳结构下方进行了宽带场测量。将这些测量结果与漫射紫外线进行比较，以量化遮阳结构下方及周围的紫外线与漫射紫外线之间的关系。对于遮阳结构，已给出了晴空条件下以及太阳天顶角（SZA）为49 - 76度时漫射紫外线与遮阳处紫外线之间的关系。如果已知漫射紫外线，就可以预测这些结构遮阳处的紫外线。随着太阳天顶角减小，三种遮阳结构的紫外线防护系数范围为1.5至5.4。对于70 - 76度的较大太阳天顶角，小、中、大尺寸结构遮阳处的红斑紫外线分别为全日照下的65%、59%和51%。对于50 - 53度的较小太阳天顶角，小、中、大尺寸遮阳结构遮阳处的红斑紫外线分别为35%、41%和18%。从这项研究可以得出结论，冬季遮阳处的紫外线辐射水平可能会导致红斑及其他与阳光相关的疾病。
