Characterisation and improvement of j(O$^{1}$D) filter radiometers
Characterisation and improvement of j(O$^{1}$D) filter radiometers
复制标题
j(O$^{1}$D) 滤波器辐射计的表征和改进
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
L. Whalley
中科院分区：
文献类型：
--
作者：
B. Bohn;D. Heard;N. Mihalopoulos;C. Plass;R. Schmitt;L. Whalley
抽象的。大气 O3 → O(1D) 光解频率 j(O1D) 是大气光化学的关键参数，因为它们对于初级 OH 的形成非常重要。滤光片辐射计多年来一直用于 j(O1D) 的原位现场测量。通常，仪器的输出与 j(O1D) 之间的关系是非线性的，因为太阳光谱形状的变化取决于太阳天顶角和总臭氧柱。这些非线性可以通过基于滤波器辐射计光谱灵敏度的实验室测量和模拟太阳光化通量密度光谱的校正方法来补偿。尽管这种校正是常规应用的，但之前对几种滤光片辐射计进行的现场比较研究的结果表明，某些校正是不充分的。在这项工作中，考虑到光解过程 O3 → O(1D) 的吸收截面和量子产率的最新建议，对七种仪器的光谱特性进行了修订，并更新和协调了校正程序。使用这些程序基本上消除了以前的不一致之处。此外，还更换了光学干涉滤光片，以改善仪器的光谱特性。光谱灵敏度的连续测定以及修改后的仪器与光谱辐射计参考的现场比较证实了性能的改进。总体而言，滤光片辐射计仍然是光谱辐射计的低维护替代品，可用于精确测量 j(O1D)，前提是其光谱特性已知，并且通过使用标准灯或参考仪器进行定期校准来监测潜在的灵敏度漂移。
Abstract. Atmospheric O3 → O(1D) photolysis frequencies j(O1D) are crucial parameters for atmospheric photochemistry because of their importance for primary OH formation. Filter radiometers have been used for many years for in situ field measurements of j(O1D). Typically the relationship between the output of the instruments and j(O1D) is non-linear because of changes in the shape of the solar spectrum dependent on solar zenith angles and total ozone columns. These non-linearities can be compensated for by a correction method based on laboratory measurements of the spectral sensitivity of the filter radiometer and simulated solar actinic flux density spectra. Although this correction is routinely applied, the results of a previous field comparison study of several filter radiometers revealed that some corrections were inadequate. In this work the spectral characterisations of seven instruments were revised, and the correction procedures were updated and harmonised considering recent recommendations of absorption cross sections and quantum yields of the photolysis process O3 → O(1D). Previous inconsistencies were largely removed using these procedures. In addition, optical interference filters were replaced to improve the spectral properties of the instruments. Successive determinations of spectral sensitivities and field comparisons of the modified instruments with a spectroradiometer reference confirmed the improved performance. Overall, filter radiometers remain a low-maintenance alternative of spectroradiometers for accurate measurements of j(O1D) provided their spectral properties are known and potential drifts in sensitivities are monitored by regular calibrations with standard lamps or reference instruments.
影响因子：
2
作者：
Carpenter, L. J.;Fleming, Z. L.;Wallace, D. W. R.
通讯作者：
Wallace, D. W. R.