All-Sky Infrared Radiances Assimilation of Selected Humidity Sensitive IASI Channels at NCEP/EMC

All sky infrared radiances assimilation work of selected humidity sensitive Infrared Atmospheric Sounding Interferometer (IASI) channels using National Centers for Environmental Prediction’s (NCEP) Global Forecast System (GFS) will be the main focus of this work. Cloudy radiance simulations are conducted by the latest Community Radiative Transfer Model (CRTM) using the cloud cover option. This version of the CRTM also generates jacobians of liquid-water and ice-water content. In this study, results from parallel experiment for one season will be presented. The experiments are defined as the operational baseline and the operational baseline adding ten selected water vapor sensitive channels from IASI on MetOp-a/b. Cloud cover options will also be discussed. Cloud-dependent quality controls and observation error are evaluated in this study based on the cloud effect. The goal for this preliminary work is to extend NCEP’ microwave all sky radiances into the infrared spectrum.