Observation monitoring is performed for all the observations in the CNMCA-LETKF domain. Observation increments are derived with respect to the deterministic background (BG) and Analysis (AN). The monitoring include computation of bias and standard deviation of these deviances. Monthly (or longer period) statistics of observation increments are produced for single station identifier or class of observations (aircraft, surface, radiosoundings etc) averaged over the whole domain.

An example is given below.