AIRS science team meeting, Greenbelt, 31 March 2003 Holger Vmel University of Colorado and NOAA/CMDL Cryogenic Frost point Hygrometer (CFH) Measurements during AWEX and previous RS90 comparisons Overview The University of Colorado Cryogenic Frost point Hygrometer (CU-CFH) Accuracies SnowWhite comparison with CFH RS90 comparisons with NOAA/CMDL hygrometer CU-CFH Sonde Weight: ~ 500 gr Microprocessor controlled Digital interface with ECC Easy to use and robust Continuous measurements between surface and 28 km Night launch, Oklahoma Accuracy Measurement uncertainty of frostpoint temperature (AWEX)