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首页> 外文会议>Tenth International Conference on Modelling, Monitoring and Management of Air Pollution Jul, 2002 City of Segovia >A new method of derivation of photolysis rate from a moderate bandwidth filter radiometer
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A new method of derivation of photolysis rate from a moderate bandwidth filter radiometer

机译：从中频带宽滤光计推算光解速率的新方法

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The relevant measure of radiation for atmospheric chemistry is actinic flux, but the great majority of UV measurements, not common in themselves, are UV irradiance (radiation on a flat surface). Ideally the radiation measurements should also give full spectral detail, however, only a subset of monitoring sites can provide this information. This study describes a method to derive the photodissociation rate of O_3 and NO_2 from irradiance measurements with a moderate bandwidth filter radiometer that has five channels in the UV region with center wavelengths at 305, 313, 320, 340 and 380 run with bandpass function of 10 nm. The global irradiance measurements from GUV in Manchester, U.K. (78 m altitude, 53.28°N, 2.14°W) were compared with independently measured photolysis rates determined from the measured actinic flux on a single clear sky day. On the reference day a linear regression of GUV global irradiance to simultaneous photolysis rate measurements was performed to generate scale factors for each optical channel. This enables the derivation of an empirical equation by which the measured global irradiance is converted to the photodissociation rate using selected channels of GUV for all other days of the measurement period. The agreement between the measured and calculated photolysis rate from the empirical equation at different solar zenith angles agreed within 20% under all conditions tested. This compares well with other methods of measuring photolysis rate, and uses a low maintenance UV instrument that can be used for long-term monitoring. The results were also compared to the derived photolysis rates from a radiative transfer model using the discrete ordinate method (DISORT) by using the derived O_3 column from GUV.
机译：大气化学辐射的相关度量是光化通量，但绝大部分紫外线测量（本身并不常见）是紫外线辐照度（在平坦表面上的辐射）。理想情况下，辐射测量值还应提供完整的光谱详细信息，但是，只有一部分监视站点可以提供此信息。这项研究描述了一种使用中等带宽滤光片辐射计从辐照度测量中得出O_3和NO_2的光解离速率的方法，该辐射计在UV区具有五个通道，中心波长分别为305、313、320、340和380，带通功能为10纳米将来自英国曼彻斯特（78 m高度，53.28°N，2.14°W）的GUV的全球辐照度测量结果与在单个晴朗的天空日根据测得的光化通量确定的独立测得的光解速率进行了比较。在参考日，进行了GUV总辐照度对同时光解速率测量的线性回归，以生成每个光学通道的比例因子。这使得能够导出经验方程式，通过该方程式，可以在测量周期的所有其他天中使用选定的GUV通道将测得的总辐照度转换为光解离速率。在所有测试条件下，根据经验公式在不同的太阳天顶角下测得的光解速率和计算出的光解速率之间的一致性在20％以内。这与其他测量光解速率的方法相比非常好，并且使用了维护成本低的紫外线仪器，可用于长期监测。还将结果与使用GUV派生的O_3列，使用离散纵坐标方法（DISORT）从辐射传递模型得出的光解速率进行比较。

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