NASA's Atmospheric Infrared Sounder (AIRS) provides a data record that extends from its 2002 launch to the present. The Infrared Atmospheric Sounding Interferometer (IASI) onboard Metop- (A launched in 2006, B in 2012), as well as the Joint Polar Satellite System (JPSS) Cross-track Infrared Sounder (CrIS) launched in 2011, complement this data record. Next generation infrared sounders with similar capabilities will augment these measurements into the near future.
We have created a database of daily global observations, of the nadir-most field-of-views, for each of the instruments listed above. Seasonal trends can be distinguished from these measurements with greater than 1-sigma confidence given that both AIRS and IASI-A observations have existed for more than a decade. Subtle differences between comparable spectral channels for each of AIRS, IASI and CrIS can lead to significant differences in the observed upwelling brightness temperatures. We have taken the higher spectral resolution IASI (0.25 cm-1) data, subsampled to CrIS and AIRS spectral grids, respectively, to effectively compare data across the various platforms.