Grupo de Óptica Atmosférica, Universidad de Valladolid, Spain.
J Environ Manage. 2012 Nov 30;111:267-71. doi: 10.1016/j.jenvman.2012.07.027. Epub 2012 Sep 8.
In this work, a novel technique is used to estimate the aerosol complex index of refraction of in situ collected samples. Samples of atmospheric particulate matter were collected in El Arenosillo, southern Spain, on polycarbonate filters during summer 2004 as part of an aerosol characterization campaign. These samples were analyzed for the volumetric absorption coefficient in the 320-800 nm spectral region and an estimation of the effective imaginary refractive index was made. The values of the imaginary part of the complex refractive index ranged between 0.0009-0.0215 at 800 nm and 0.0015-0.0114 at 320 nm. Little dependence on the wavelength was observed. Several intense and long lasting desert outbreaks were registered during the campaign and the complex refractive index almost doubles its value during these dust events. Finally, we present a comparison of data obtained in situ with columnar data obtained from the AERONET network. A correlation factor of 0.64 was obtained between both data, which gives an idea of how accurately the in situ ground data represent the total column.
在这项工作中，使用了一种新的技术来估计现场采集样本的气溶胶复折射指数。作为气溶胶特性研究活动的一部分，2004 年夏季在西班牙南部的埃尔阿雷纳斯罗，使用聚碳酸酯滤膜对大气颗粒物进行了采样。对这些样品在 320-800nm 光谱区域内的体积吸收系数进行了分析，并对有效复折射率的实部进行了估算。在 800nm 处，复折射率虚部的值在 0.0009-0.0215 之间，在 320nm 处，复折射率虚部的值在 0.0015-0.0114 之间。几乎没有观察到对波长的依赖性。在研究期间记录到几次强烈而持久的沙漠爆发，在这些沙尘事件中，复折射率几乎增加了一倍。最后，我们比较了现场获得的数据和从 AERONET 网络获得的柱状数据。这两种数据之间的相关系数为 0.64，这表明现场地面数据在多大程度上准确地代表了总柱。
