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首页> 外文期刊>Estuarine Coastal and Shelf Science >Measurements of mineral particle optical absorption properties in turbid estuaries: Intercomparison of methods and implications for optical inversions
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Measurements of mineral particle optical absorption properties in turbid estuaries: Intercomparison of methods and implications for optical inversions

机译：浊河口中矿物颗粒光吸收特性的测量：方法的比对和光学反演的意义

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摘要

We examine optical measurements of total particle absorption and mass specific mineral particle absorption collected from two mineral-rich turbid estuaries. Particle absorptions derived from measurements made with profiling radiometers are compared to those obtained using the Quantitative Filter Technique (QFT). A range of different backscattering ratios and pathlength amplification correc-tions, used to interpret the radiometer and QFT data respectively, are assessed. We also examine what impact the process of removing organic material from QFT samples by combustion has on the measured absorption properties of mineral particles. Our results show that the process of combustion changes the measured absorption properties of mineral particles retained on filters and we show that if the absorption properties of mineral particles are obtained from combusted QFT samples, significant errors can result in optical inversions that require estimates of mass specific mineral particle absorption. In contrast, using mass specific mineral particle absorption coefficients obtained from a regression tech-nique significantly improves the accuracy of our optical inversion results. A correction for mineral particle absorption measurements derived from combusted QFT samples is presented, and assessed by application to an independent dataset.
机译：我们检查了从两个富含矿物质的混浊河口收集的总颗粒吸收量和特定质量矿物颗粒吸收量的光学测量结果。将使用轮廓辐射计进行测量得出的颗粒吸收与使用定量过滤技术（QFT）获得的吸收进行比较。评估了分别用于解释辐射计和QFT数据的一系列不同的反向散射比和路径长度放大校正。我们还研究了通过燃烧从QFT样品中去除有机材料的过程对所测量的矿物颗粒吸收性能有何影响。我们的结果表明，燃烧过程改变了保留在过滤器上的矿物颗粒的测量吸收性能，并且我们表明，如果矿物颗粒的吸收性能是从燃烧的QFT样品中获得的，则明显的误差会导致光学倒置，从而需要对质量比进行估算矿物颗粒吸收。相比之下，使用从回归技术获得的特定质量矿物颗粒的吸收系数会大大提高我们的光学反演结果的准确性。提出了对来自燃烧QFT样品的矿物颗粒吸收测量值的校正，并通过应用于独立数据集进行了评估。

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