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首页> 外文期刊>Applied optics >Vertical profiles of pure dust and mixed smoke-dust plumes inferred from inversion of multiwavelength Raman/polarization lidar data and comparison to AERONET retrievals and in situ observations
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Vertical profiles of pure dust and mixed smoke-dust plumes inferred from inversion of multiwavelength Raman/polarization lidar data and comparison to AERONET retrievals and in situ observations

机译：从多波长拉曼/极化激光雷达数据反演以及与AERONET检索和原位观测的比较中推断出纯尘和烟尘混合气羽的垂直剖面

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We present for the first time vertical profiles of microphysical properties of pure mineral dust (largely unaffected by any other aerosol types) on the basis of the inversion of optical data collected with multi-wavelength polarization Raman lidar. The data were taken during the Saharan Mineral Dust Experiment (SAMUM) in Morocco in 2006. We also investigated two cases of mixed dust-smoke plumes on the basis of data collected during the second SAMUM field campaign that took place in the Republic of Cape Verde in 2008. Following the experience of the Aerosol Robotic Network (AERONET), the dust is modeled as a mixture of spherical particles and randomly oriented spheroids. The retrieval is performed from the full set of lidar input data (three backscatter coefficients, two extinction coefficients, and one depolarization ratio) and from a reduced set of data in which we exclude the depolarization ratio. We find differences of the microphysical properties depending on what kind of optical data combination we use. For the case of pure mineral dust, the results from these two sets of optical data are consistent and confirm the validity of the spheroid particle model for data inversion. Our results indicate that in the case of pure mineral dust we do not need depolarization information in the inversion. For the mixture of dust and biomass burning, there seem to be more limitations in the retrieval accuracy of the various data products. The evaluation of the quality of our data products is done by comparing our lidar-derived data products (vertically resolved) to results from AERONET Sun photometer observations (column-averaged) carried out at the lidar field site. Our results for dust effective radius show agreement with the AERONET observations within the retrieval uncertainties. Regarding the complex refractive index a comparison is difficult, as AERONET provides this parameter as wavelength-dependent quantity. In contrast, our inversion algorithm provides this parameter as a wavelength-independent quantity. We also show some comparison to results from airborne in situ observation. A detailed comparison to in situ results will be left for a future contribution.
机译：我们首次基于多波长偏振拉曼激光雷达收集的光学数据的反演，首次提出了纯矿物粉尘（基本上不受任何其他气溶胶类型影响）的微物理性质的垂直剖面。数据是在2006年摩洛哥的撒哈拉矿物粉尘实验（SAMUM）期间获得的。我们还根据在佛得角共和国进行的第二次SAMUM野外活动期间收集的数据，调查了两起混合烟尘羽流的案例。在2008年。根据气溶胶机器人网络（AERONET）的经验，将灰尘建模为球形颗粒和随机取向的球体的混合物。检索是从激光雷达输入​​数据的全部集合（三个反向散射系数，两个消光系数和一个去极化率）以及减少的数据集中（其中不包括去极化率）执行的。我们发现微观物理特性的差异取决于我们使用哪种光学数据组合。对于纯矿物粉尘，这两组光学数据的结果是一致的，并证实了球状粒子模型用于数据反演的有效性。我们的结果表明，在纯矿物粉尘的情况下，我们在反演中不需要去极化信息。对于粉尘和生物质燃烧的混合物，各种数据产品的检索精度似乎存在更多限制。通过将我们的激光雷达衍生数据产品（垂直解析）与在激光雷达现场进行的AERONET太阳光度计观测结果（列平均）进行比较，可以对我们的数据产品质量进行评估。我们的尘埃有效半径结果与AERONET观测结果在反演不确定性范围内一致。关于复折射率，比较是困难的，因为AERONET将该参数作为与波长相关的量来提供。相反，我们的反演算法将此参数提供为与波长无关的量。我们还显示了一些与机载原位观测结果的比较。与原位结果的详细比较将留作将来的贡献。

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