Abstract
The Cross-Track Infrared Sounder (CrIS) collects spectra used in atmospheric soundings with twice daily global coverage. A demonstration CrIS is part of Suomi-NPP and has been collecting spectra on orbit since 2012. The S-NPP CrIS has been extensively validated against other satellite sensors and with dedicated simultaneous aircraft campaigns. NOAA-20 launched in November 2017 and its CrIS interferometer data is currently at the provisional status level. Direct data comparisons between the CrIS interferometers are essential to demonstrate that the new system is performing as well or better than the S-NPP CrIS. S-NPP and NOAA-20 are in the same orbital plane but 50 minutes apart, creating view angle and time differences when measuring the same geographical region. This talk demonstrates how these differences can be corrected using the radiative transfer model MODTRAN 6 initialized using atmospheric conditions from NASA atmospheric and NOAA numerical weather models. Initial results show excellent agreement between the two on-orbit data sets.
Data Inter-comparisons of the CrIS Interferometers on Suomi-NPP and NOAA-20
The Cross-Track Infrared Sounder (CrIS) collects spectra used in atmospheric soundings with twice daily global coverage. A demonstration CrIS is part of Suomi-NPP and has been collecting spectra on orbit since 2012. The S-NPP CrIS has been extensively validated against other satellite sensors and with dedicated simultaneous aircraft campaigns. NOAA-20 launched in November 2017 and its CrIS interferometer data is currently at the provisional status level. Direct data comparisons between the CrIS interferometers are essential to demonstrate that the new system is performing as well or better than the S-NPP CrIS. S-NPP and NOAA-20 are in the same orbital plane but 50 minutes apart, creating view angle and time differences when measuring the same geographical region. This talk demonstrates how these differences can be corrected using the radiative transfer model MODTRAN 6 initialized using atmospheric conditions from NASA atmospheric and NOAA numerical weather models. Initial results show excellent agreement between the two on-orbit data sets.