The University of Valladolid (UVa, Spain) has managed a calibration center of the AErosol RObotic NETwork (AERONET) since 2006. The CÆLIS software tool, developed by UVa, was created to manage the data generated by AERONET photometers for calibration, quality control and data processing purposes. This paper exploits the potential of this tool in order to obtain products like the aerosol optical depth (AOD) and Ångström exponent (AE), which are of high interest for atmospheric and climate studies, as well as to enhance the quality control of the instruments and data managed by CÆLIS. The AOD and cloud screening algorithms implemented in CÆLIS, both based on AERONET version 3, are described in detail. The obtained products are compared with the AERONET database. In general, the differences in daytime AOD between CÆLIS and AERONET are far below the expected uncertainty of the instrument, ranging in mean differences between $-\mathrm{1.3}\times {\mathrm{10}}^{-\mathrm{4}}$ at 870 nm and $\mathrm{6.2}\times {\mathrm{10}}^{-\mathrm{4}}$ at 380 nm. The standard deviations of the differences range from $\mathrm{2.8}\times {\mathrm{10}}^{-\mathrm{4}}$ at 675 nm to $\mathrm{8.1}\times {\mathrm{10}}^{-\mathrm{4}}$ at 340 nm. The AOD and AE at nighttime calculated by CÆLIS from Moon observations are also presented, showing good continuity between day and nighttime for different locations, aerosol loads and Moon phase angles. Regarding cloud screening, around 99.9 % of the observations classified as cloud-free by CÆLIS are also assumed cloud-free by AERONET; this percentage is similar for the cases considered cloud-contaminated by both databases. The obtained results point out the capability of CÆLIS as a processing system. The AOD algorithm provides the opportunity to use this tool with other instrument types and to retrieve other aerosol products in the future.

中文翻译：

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在CÆLIS中实现白天和晚上的气溶胶光学深度测量

瓦拉多利德大学（西班牙UVa）自2006年以来一直管理着AErosol机器人网络（AERONET）的校准中心。由UVa开发的CÆLIS软件工具用于管理AERONET光度计生成的数据，用于校准，质量控制和数据处理目的。本文利用该工具的潜力来获得诸如气溶胶光学深度（AOD）和Ångström指数（AE）之类的产品，这些产品在大气和气候研究中非常受关注，并且可以增强仪器的质量控制以及由CÆLIS管理的数据。详细介绍了均基于AERONET版本3的CÆLIS中实现的AOD和云筛选算法。将获得的产品与AERONET数据库进行比较。一般来说，$--\mathrm{1.3}\times {\mathrm{10}}^{--\mathrm{4}}$ 在870 nm和 $\mathrm{6.2}\times {\mathrm{10}}^{--\mathrm{4}}$在380海里 差异的标准偏差范围为$\mathrm{2.8}\times {\mathrm{10}}^{--\mathrm{4}}$ 在675 nm至 $\mathrm{8.1}\times {\mathrm{10}}^{--\mathrm{4}}$在340 nm 还介绍了由CÆLIS根据月球观测值计算的夜间AOD和AE，显示了白天和夜间在不同位置，气溶胶负荷和月相角方面的良好连续性。关于云筛查，AERONET还假定约有99.9％的CÆLIS分类为无云观测值；对于两个数据库都认为受到云污染的情况，此百分比相似。所得结果指出了CÆLIS作为处理系统的能力。AOD算法为将来将此工具与其他类型的仪器一起使用以及将来检索其他气溶胶产品提供了机会。