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While stand alone satellite and model aerosol products see wide utilization,there is a significant need in numerous atmospheric and climate applicationsfor a fused product on a regular grid. Aerosol data assimilation is anoperational reality at numerous centers, and like meteorological reanalyses,aerosol reanalyses will see significant use in the near future. Here wepresent a standardized 2003–2013 global 1 × 1° and 6-hourlymodal aerosol optical thickness (AOT) reanalysis product. This data set can beapplied to basic and applied Earth system science studies of significantaerosol events, aerosol impacts on numerical weather prediction, andelectro-optical propagation and sensor performance, among other uses. Thispaper describes the science of how to develop and score an aerosol reanalysisproduct. This reanalysis utilizes a modified Navy Aerosol Analysis and Prediction System (NAAPS) at its core and assimilates quality controlledretrievals of AOT from the Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra and Aqua and the Multi-angle Imaging SpectroRadiometer (MISR) on Terra. The aerosol source functions, including dust and smoke, wereregionally tuned to obtain the best match between the model fine- and coarse-mode AOTs and the Aerosol Robotic Network (AERONET) AOTs. Other modelprocesses, including deposition, were tuned to minimize the AOT differencebetween the model and satellite AOT. Aerosol wet deposition in the tropics isdriven with satellite-retrieved precipitation, rather than the model field.The final reanalyzed fine- and coarse-mode AOT at 550 nm is shown to havegood agreement with AERONET observations, with global mean root mean squareerror around 0.1 for both fine- and coarse-mode AOTs. This paper includes adiscussion of issues particular to aerosol reanalyses that make them distinctfrom standard meteorological reanalyses, considerations for extending such areanalysis outside of the NASA A-Train era, and examples of how the aerosolreanalysis can be applied or fused with other model or remote sensingproducts. Finally, the reanalysis is evaluated in comparison with otheravailable studies of aerosol trends, and the implications of this comparisonare discussed

An 11-year global gridded aerosol optical thickness reanalysis (v1.0) for atmospheric and climate sciences