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Narrowband filter radiometer for ground-based measurements of global ultraviolet solar irradiance and total ozone

机译：窄带滤光辐射计，用于地面测量全球紫外线太阳辐射和总臭氧

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摘要

The ultraviolet narrowband filter radiometer (UV-RAD) designed by the authors to take ground-based measurements of UV solar irradiance, total ozone, and biological dose rate is described, together with the main characteristics of the seven blocked filters mounted on it, all of which have full widths at half maxima that range 0.67 to 0.98 nm. We have analyzed the causes of cosine response and calibration errors carefully to define the corresponding correction terms, paying particular attention to those that are due to the spectral displacements of the filter transmittance peaks from the integer wavelength values. The influence of the ozone profile on the retrieved ozone at large solar zenith angles has also been examined by means of field measurements. The opportunity of carrying out nearly monochromatic irradiance measurements offered by the UV-RAD allowed us to improve the procedure usually followed to reconstruct the solar spectrum at the surface by fitting the computed results, using radiative transfer models with field measurements of irradiance. Two long-term comparison campaigns took place, showing that a mean discrepancy of +0.3percent exists between the UV-RAD total ozone values and those given by the Brewer #63 spectroradiometer and that mean differences of +0.3percent and -0.9percent exist between the erythemal dose rates determined with the UV-RAD and those obtained with the Brewer #63 and the Brewer #104 spectroradiometers, respectively.
机译：描述了作者设计的紫外线窄带滤光片辐射计（UV-RAD），用于对紫外线的太阳辐射，总臭氧和生物剂量率进行地面测量，以及安装在其上的七个封闭滤光片的主要特性，所有其中半峰全宽为0.67至0.98 nm。我们已经仔细分析了余弦响应和校准误差的原因，以定义相应的校正项，尤其要注意那些由于滤光器透射率峰从整数波长值的光谱位移而引起的校正项。臭氧分布对大太阳天顶角下回收的臭氧的影响也已经通过现场测量的方法进行了研究。进行UV-RAD提供的近乎单色的辐照度测量的机会使我们能够通过使用具有辐射场测量值的辐射传递模型来拟合计算结果，从而改进通常在表面重建太阳光谱所遵循的程序。进行了两次长期比较运动，结果表明，UV-RAD总臭氧值与Brewer＃63分光光度计给出的平均值之间存在+ 0.3％的平均差异，并且之间存在+ 0.3％和-0.9％的平均差异。用UV-RAD确定的红斑剂量率以及使用Brewer＃63和Brewer＃104分光光度计获得的剂量。

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