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Pixel‐level analysis of MODIS and MISR aerosol products

Because of the global nature of aerosol effects on climate, satellite observations have been an indispensable source of information about aerosol distributions for use in various assessments of climate and climate change. There have been parallel claims of unprecedented accuracy of aerosol retrievals with the Moderate‐Resolution Imaging Spectroradiometer (MODIS) and Multiangle Imaging SpectroRadiometer (MISR). These claims have been based on limited comparisons with ground‐based observations which, however, are not necessarily indicative of the actual global performance of these satellite sensors. Fortunately, both instruments have been flown for many years on the same Terra platform, which provides a unique opportunity to compare fully collocated pixel‐level MODIS and MISR aerosol retrievals directly and globally. Our present extensive analysis of ∼8 years of the MODIS‐Terra and MISR aerosol data demonstrates profound disagreements at the pixel level as well as between long‐term averages of aerosol prope...