The purposes of monitoring the data assimilation system are to ensure the proper performance of the assimilation system and to diagnose problems with the system for future improvements. Furthermore, it provides statistics for use in the assimilation system. The statistics shown here include the bias correction and the observed-minus-simulated radiance statistics (with or without bias correction).
The sources of the departure statistics between the observed and the simulated radiance include: (i) errors in the observed data (ii) errors in the profile obtained from the forecast model, and (iii) errors in the radiative-transfer model used to compute radiance from the forecast.
Some observation numbers may have the decimal points because they are normalized by the cycle numbers.