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首页> 外文期刊>Applied optics >USE OF SKY BRIGHTNESS MEASUREMENTS FROM GROUND FOR REMOTE SENSING OF PARTICULATE POLYDISPERSIONS
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USE OF SKY BRIGHTNESS MEASUREMENTS FROM GROUND FOR REMOTE SENSING OF PARTICULATE POLYDISPERSIONS

机译：将地面的天空亮度测量值用于颗粒状多分散体的遥感

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The software code SKYRAD.pack for retrieval of aerosol size distribution and optical thickness from data of direct and diffuse solar radiation is described; measurements are carried out with sky radiometers in the wavelength range 0.369-1.048 mu m. The treatment of the radiative transfer problem concerning the optical quantities is mainly based on the IMS (improved multiple and single scattering) method, which uses the delta-M approximation for the truncation of the aerosol phase function and corrects the solution for the first- and second-order scattering. Both linear and nonlinear inversion methods can be used for retrieving the size distribution. Improved calibration methods for both direct and diffuse radiation, the data-analysis procedure, the results from the proposed code, and several connected problems are discussed. The results can be summarized as follows: (a) the SKYRAD.pack code can retrieve the columnar aerosol features with accuracy and efficiency in several environmental situations, provided the input parameters are correctly given; (b) when data of both direct and diffuse solar radiation are used, the detectable radius interval for aerosol particles is approximately from 0.03 to 10 mu m; (c) besides the retrieval of the aerosol features, the data-analysis procedure also permits the determination of average values for three input parameters (real and imaginary aerosol refractive index, ground albedo) from the optical data; (d) absolute calibrations for the sky radiometer are not needed, and calibrations for direct and diffuse radiation can be carried out with held data; (e) the nonlinear inversion gives satisfactory results in a larger radius interval, without the unrealistic humps that occur with the linear inversion, but the results strongly depend on the first-guess spectrum; (f) aerosol features retrieved from simulated data showed a better agreement with the given data for the linear inversion than for the nonlinear inversion. (C) 1996 Optical Society of America [References: 66]
机译：描述了用于从直接和漫射太阳辐射数据中检索气溶胶尺寸分布和光学厚度的软件代码SKYRAD.pack;使用波长范围为0.369-1.048μm的天空辐射计进行测量。处理与光量有关的辐射传递问题主要基于IMS（改进的多次散射和单次散射）方法，该方法使用delta-M近似来截断气溶胶相函数并校正第一和第二解的解。二阶散射。线性和非线性反演方法均可用于检索尺寸分布。讨论了直接辐射和散射辐射的改进校准方法，数据分析程序，拟议代码的结果以及一些相关问题。结果可总结如下：（a）只要正确给出输入参数，SKYRAD.pack代码可以在几种环境情况下准确，高效地检索柱状气溶胶特征; （b）当使用直接太阳辐射和漫射太阳辐射的数据时，气溶胶颗粒的可探测半径间隔约为0.03至10μm; （c）除了获取气溶胶特征外，数据分析程序还允许从光学数据中确定三个输入参数（真实和虚构的气溶胶折射率，地面反照率）的平均值; （d）不需要对天空辐射计进行绝对校准，并且可以利用所保存的数据对直接辐射和散射辐射进行校准; （e）非线性反演在较大的半径间隔内给出令人满意的结果，而不会出现线性反演时出现的不切实际的驼峰，但结果很大程度上取决于第一猜测谱; （f）从模拟数据中检索到的气溶胶特征与线性反演的给定数据相比，与非线性反演的给定数据具有更好的一致性。 （C）1996年美国眼镜学会[参考文献：66]

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