CrIS EDR Validation Assessment Model: test case study using IASI and AIRS retrievals

Validation Assessment Model developed for the CrIS on NPP/NPOESS mission has been tested through its application to the validation of the EUMETSAT IASI temperature and water vapor retrievals against correlative radiosondes during July - August 2007. It has been also used to compare the IASI retrievals with the AIRS NOAA retrievals over Lindenberg for the same period. It has been demonstrated that IASI temperature retrievals perform to the expected accuracy. Averaging kernels adequately characterize the data. Assessed errors for water vapor are higher than expected but that may be caused by deficiency of radiosonde as the water vapor validation reference source. AIRS and IASI retrievals agree to the expected level of discrepancy caused by temporal non-coincidence of the overpasses.