Vilaplana José M, Cachorro Victoria E, Sorribas Mar, Luccini Eduardo, de Frutos Angel M, Berjón Alberto, de la Morena Benito
INTA/Dpto. de Observación de la Tierra, Teledetección y Atmósfera, Estación de Sondeos Atmosféricos El Arenosillo, Huelva, España.
Photochem Photobiol. 2006 Mar-Apr;82(2):508-14. doi: 10.1562/2005-06-23-RA-590.
The calibration of the erythemal irradiance measured by a Yankee Environmental System (YES) UVB-1 biometer is presented using two methods of calibration with a wide range of experimental solar zenith angles (SZAs) and ozone values. The calibration is performed through simultaneous spectral measurements by a calibrated double-monochromator Brewer MK-III spectrophotometer at "El Arenosillo" station, located in southwestern Spain. Because the range of spectral measurements of the Brewer spectrophotometer is 290-363 nm, a previously validated radiative transfer model was used to account for the erythemal contribution between 363 and 400 nm. Both methods are recommended by the World Meteorological Organization and we present and discuss here a wide range of results and features given by modified procedures applied to these two general methods. As is well established, the calibration factor for this type of radiometric system is dependent on atmospheric conditions, the most important of which are the ozone content and the SZA. Although the first method is insensitive to these two factors, we analyze this behavior in terms of the range used for the SZA and the use of two different mathematical approaches for its determination. The second method shows the dependence on SZA and ozone content and, thus, a polynomial as a function of SZA or a matrix including SZA and ozone content were determined as general calibration factors for the UV radiometric system. We must note that the angular responses of the YES radiometer and Brewer spectroradiometer have not been considered, because of the difficulty in correcting them. The results show in detail the advantages and drawbacks (and the corresponding associated error) given by the different approaches used for the determination of these calibration coefficients.
本文介绍了使用两种校准方法对Yankee环境系统（YES）UVB - 1生物光度计测量的红斑辐照度进行校准的过程，校准过程涵盖了广泛的实验太阳天顶角（SZA）和臭氧值范围。校准是通过位于西班牙西南部的“埃尔阿雷西洛”站的校准双单色仪布鲁尔MK - III分光光度计进行同步光谱测量来完成的。由于布鲁尔分光光度计的光谱测量范围是290 - 363 nm，因此使用了一个先前经过验证的辐射传输模型来计算363至400 nm之间的红斑贡献。这两种方法均为世界气象组织所推荐，我们在此展示并讨论了应用于这两种通用方法的修改程序所给出的广泛结果和特征。众所周知，这类辐射测量系统的校准因子取决于大气条件，其中最重要的是臭氧含量和太阳天顶角。尽管第一种方法对这两个因素不敏感，但我们根据太阳天顶角所使用的范围以及用于其测定的两种不同数学方法来分析这种行为。第二种方法显示出对太阳天顶角和臭氧含量的依赖性，因此，将作为太阳天顶角函数的多项式或包含太阳天顶角和臭氧含量的矩阵确定为紫外线辐射测量系统的通用校准因子。我们必须指出，由于难以对其进行校正，所以未考虑YES辐射计和布鲁尔光谱辐射计的角度响应。结果详细展示了用于确定这些校准系数的不同方法所具有的优点和缺点（以及相应的相关误差）。
