ATMS has 22 channels, combining most of the channels from AMSU-A and Microwave Humidity Sounder (MHS). ATMS is different from AMSU-A and MHS in beam width, number of field of views, and scan swath width. Some channels also have different frequency/polarization. In this study, quality control procedures due to unique ATMS features and for MHS-like channels are discussed, the observation error assignment is examined, and the results of all-sky ATMS radiance impact experiments are presented.
In addition to the expansion of all-sky radiance assimilation to ATMS, several important issues are in their early phase of development for the more general enhancements, such as the strategies on handling convective clouds in the all-sky radiance assimilation and the application of variational quality control to radiances.