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首页> 外文期刊>Journal of atmospheric and oceanic technology >The Use of Direct Observations over the Aerosol Particle Size Distribution for Inverting Lidar Data
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The Use of Direct Observations over the Aerosol Particle Size Distribution for Inverting Lidar Data

机译：使用直接观测的气溶胶粒径分布反演激光雷达数据

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The work is concerned with the inversion of horizontal lidar data into the aerosol particle size distribution (APSD). The aerosol is assumed to consist of spherical particles of continental and oceanic origin. The particular refraction index is supposed to be known. It is shown that whereas the inversion method of mean ordinates works satisfactorily for aerosols of smooth particle size distributions, the retrieval of nonsmooth distributions yields only their general slope. This is particularly true for distributions whose components are represented by markedly isolated peaks. Numerical experiments were performed by imposing a constraint on the sought-for solution for a further improvement of the inversion efficiency. For constraint, an APSD was used on a limited particle size interval. The results showed that the above constraint can significantly improve the inversion accuracy not only on the size interval chosen for constraint, but also on the entire particle size range. The inversion accuracy increased with the increase of the constraint precision. The imposition of an APSD constraint proved to be particularly promising when applied to distributions with separate component peaks. The observation data of the Shoreline Environment Aerosol Study (SEAS) were used to test the results of the numerical experiments. The test substantiated the theoretical conclusions about the efficiency of the method of mean ordinates for inverting lidar data into APSD. The recourse to the constraint of the experimental APSD improved the inversion results somewhat further. However, with the data available, it is so far impossible to make the constraint strict enough to maximize the effect.
机译：这项工作涉及将水平激光雷达数据转换成气溶胶粒径分布（APSD）。假定气溶胶由大陆和海洋起源的球形颗粒组成。特定的折射率应该是已知的。结果表明，尽管平均坐标的反演方法对于粒径分布平稳的气溶胶令人满意，但非光滑分布的反演仅产生其一般斜率。对于其成分由明显孤立的峰表示的分布尤其如此。通过对寻找的解决方案施加约束来进行数值实验，以进一步提高反演效率。为了限制，在有限的粒度间隔上使用了APSD。结果表明，上述约束条件不仅可以显着提高约束条件选择的粒度区间，而且可以在整个粒径范围内显着提高反演精度。反演精度随着约束精度的提高而提高。当将APSD约束应用于具有单独成分峰的分布时，被证明特别有前途。海岸线环境气溶胶研究（SEAS）的观测数据用于测试数值实验的结果。该测试证实了有关将激光雷达数据转换为APSD的平均坐标方法的效率的理论结论。借助实验性APSD的约束，反演结果有所改善。但是，利用可用的数据，到目前为止，不可能使约束足够严格以最大化效果。

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