Zieger Paul, Ruhtz Thomas, Preusker Rene, Fischer Jürgen
Institute for Space Sciences, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, D-12165 Berlin, Germany.
Appl Opt. 2007 Dec 10;46(35):8542-52. doi: 10.1364/ao.46.008542.
We have designed an airborne spectrometer system for the simultaneous measurement of the direct sun irradiance and the aureole radiance in two different solid angles. The high-resolution spectral radiation measurements are used to derive vertical profiles of aerosol optical properties. Combined measurements in two solid angles provide better information about the aerosol type without additional and elaborate measuring geometries. It is even possible to discriminate between absorbing and nonabsorbing aerosol types. Furthermore, they allow to apply additional calibration methods and simplify the detection of contaminated data (e.g., by thin cirrus clouds). For the characterization of the detected aerosol type a new index is introduced that is the slope of the aerosol phase function in the forward scattering region. The instrumentation is a flexible modular setup, which has already been successfully applied in airborne and ground-based field campaigns. We describe the setup as well as the calibration of the instrument. In addition, example vertical profiles of aerosol optical properties--including the aureole measurements--are shown and discussed.
我们设计了一种机载光谱仪系统，用于同时测量两个不同立体角下的太阳直射辐照度和晕圈辐射度。高分辨率光谱辐射测量用于推导气溶胶光学特性的垂直剖面。在两个立体角下的联合测量无需额外复杂的测量几何结构就能提供有关气溶胶类型的更好信息。甚至有可能区分吸收性和非吸收性气溶胶类型。此外，它们允许应用额外的校准方法并简化对受污染数据（例如薄卷云造成的污染数据）的检测。为了表征检测到的气溶胶类型，引入了一个新指标，即前向散射区域中气溶胶相函数的斜率。该仪器是一种灵活的模块化装置，已成功应用于机载和地面野外测量活动。我们描述了该装置以及仪器的校准。此外，还展示并讨论了气溶胶光学特性的示例垂直剖面，包括晕圈测量结果。
