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Solar actinic flux spectroradiometry: a technique for measuring photolysis frequencies in the atmosphere

机译：太阳光化通量光谱法：一种测量大气中光解频率的技术

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摘要

A spectroradiometer has been developed for direct measurement of the solar actinic UV flux (scalar intensity) and determination of photolysis frequencies in the atmosphere. The instrument is based on a scanning double monochromator with an entrance optic that exhibits an isotropic angular response over a solid angle of 2π sr. Actinic flux spectra are measured at a resolution of 1 nm across a range of 280－420 nm, which is relevant for most tropospheric photolysis processes. The photolysis frequencies are derived from the measured radiation spectra by use of published absorption cross sections and quantum yields. The advantage of this technique compared with the traditional chemical actinometry is its versatility. It is possible to determine the phototysis frequency for any photochemical reaction of interest provided that the respective molecular photodissociation parameters are known and the absorption cross section falls within a wavelength range that is accessible by the spectroradiometer. The instrument and the calibration procedures are described in detail, and problems specific to measurement of the actinic radiation are discussed. An error analysis is presented together with a discussion of the spectral requirements of the instrument for Accurate measurements of important tropospheric photolysis frequencies (J_(o~(t)D)), J_(NO_(2)), J_(HCHO)). An example of measurements from previous atmospheric chemistry field campaigns are presented and discussed.
机译：已经开发出一种分光辐射计，用于直接测量太阳光化紫外线通量（标量强度）和确定大气中的光解频率。该仪器基于带有入口光学器件的扫描双单色仪，该光学器件在2πsr的立体角上表现出各向同性的角度响应。在280－420 nm范围内以1 nm的分辨率测量光化通量光谱，这与大多数对流层光解过程有关。通过使用公开的吸收截面和量子产率，从测得的辐射光谱得出光解频率。与传统的化学光度法相比，该技术的优势在于它的多功能性。可以确定感兴趣的任何光化学反应的光解频率，只要相应的分子光解离参数已知并且吸收截面位于分光辐射计可访问的波长范围内即可。详细介绍了仪器和校准程序，并讨论了光化辐射测量所特有的问题。提出了误差分析，并讨论了精确测量重要对流层光解频率（J_（o〜（t）D）），J_（NO_（2）），J_（HCHO）的仪器的光谱要求。提出并讨论了以前的大气化学田间运动的测量示例。

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