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Evaluation of the aerosol models for SeaWiFS and MODIS by AERONET data over open oceans

机译：利用AERONET数据在开放海洋上评估SeaWiFS和MODIS的气溶胶模型

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The operational atmospheric correction algorithm for Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) and Moderate Resolution Imaging Spectroradiometer (MODIS) uses the predefined aerosol models to retrieve aerosol optical properties, and their accuracy depends on how well the aerosol models can represent the real aerosol optical properties. In this paper, we developed a method to evaluate the aerosol models (combined with the model selection methodology) by simulating the aerosol retrieval using the Aerosol Robotic Network (AERONET) data. Our method can evaluate the ability of aerosol models themselves, independent of the sensor performance. Two types of aerosol models for SeaWiFS and MODIS operational atmospheric correction algorithms are evaluated over global open oceans, namely the GW1994 models and Ahmad2010 models. The results show that GW1994 models significantly overestimate the aerosol optical thicknesses and underestimate the Angstrom exponent, which is caused by the underestimation of the scattering phase function. However, Ahmad2010 models can significantly reduce the overestimation of the aerosol optical thickness and the underestimation of the Angstrom exponent as a whole, but this improvement depends on the backscattering angle. Ahmad2010 models have a significant improvement in the retrieval of the aerosol optical thickness at a backscattering angle less than 140 deg. For a backscattering angle larger than 140 deg, GW1994 models are better at retrieving the aerosol optical thickness than the Ahmad2010 models.
机译：用于海上宽视场传感器（SeaWiFS）和中等分辨率成像光谱仪（MODIS）的可操作大气校正算法使用预定义的气溶胶模型来检索气溶胶光学特性，其准确性取决于气溶胶模型可以表现的良好程度真正的气溶胶光学特性。在本文中，我们开发了一种通过使用气溶胶机器人网络（AERONET）数据模拟气溶胶检索来评估气溶胶模型的方法（与模型选择方法相结合）。我们的方法可以评估气溶胶模型本身的能力，而与传感器性能无关。在全球公海中评估了两种用于SeaWiFS的气溶胶模型和MODIS大气校正算法，即GW1994模型和Ahmad2010模型。结果表明，GW1994模型明显高估了气溶胶光学厚度，而低估了埃斯特罗姆指数，这是由于散射相位函数的低估引起的。但是，Ahmad2010模型可以显着减少总体上对气溶胶光学厚度的过高估计和对Angstrom指数的低估，但是这种改善取决于反向散射角。 Ahmad2010模型在小于140度的反向散射角下，对气溶胶光学厚度的恢复具有显着改进。对于大于140度的后向散射角，GW1994模型比Ahmad2010模型更擅长检索气溶胶光学厚度。

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