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. The Aqua, SNPP (Suomi National Polar-orbiting Partnership), and JPSS (Joint Polar Satellite System) satellites carry a combination of hyperspectral infraredsounders (AIRS, Atmospheric Infrared Sounder, and CrIS, Cross-track Infrared Sounder) and high-spatial-resolution narrowband imagers (MODIS, Moderate Resolution Imaging Spectroradiometer, and VIIRS, Visible Infrared Imaging Radiometer Suite). They provide an opportunity to acquire high-quality, long-term clouddata records and are a key component of the existing Program of Record ofcloud observations. By matching observations from sounders and imagersacross different platforms at the pixel scale, this study evaluates theself-consistency and continuity of cloud retrievals from Aqua and SNPP by multiplealgorithms, including the AIRS version 7 retrieval algorithm and theCommunity Long-term Infrared Microwave Combined Atmospheric Product System (CLIMCAPS) version 2 for sounders and thestandard Aqua MODIS collection 6.1 and the NASA MODIS–VIIRS continuity cloudproducts for imagers. Metrics describing detailed statistical distributionsat the sounder field of view (FOV) and the joint histograms of cloud propertiesare evaluated. These products are found to be highly consistent despite theirretrieval from different sensors using different algorithms. Differencesbetween the two sounder cloud products are mainly due to cloud clearing andthe treatment of clouds in scenes with unsuccessful atmospheric profileretrievals. The sounder subpixel cloud heterogeneity evaluated using thestandard deviation of imager retrievals at the sounder FOV shows good agreementbetween the standard and continuity products from different satellites.However, the impact of algorithm and instrument differences between MODIS andVIIRS is revealed in cloud top pressure retrievals and in the imager clouddistribution skewness. Our study presents a unique aspect to examine NASA'sprogress toward building a continuous cloud data record with sufficientquality to investigate clouds' role in global environmental change.

Evaluating the consistency and continuity of pixel-scale cloud property data records from Aqua and SNPP (Suomi National Polar-orbiting Partnership)