An observing system simulation experiment for the impact of MTG candidate infrared sounding mission on regional forecasts: System development and preliminary results

In the proposed OSSE framework, two different models, namely, the MM5 and WRF models, were used in a nature run and data assimilation experiments, respectively, to reduce the identical twin problem.

The 5-day nature run, which included three convective storms that occurred during the period from 11 to 16 June 2002 over US Great Plains, was generated using MM5 with a 4 km. The simulated "conventional" observations and MTG-IRS retrieved temperature and humidity profiles, produced from the nature run, were then assimilated into the WRF model. Calibration experiments showed that assimilating real or simulated "conventional" observations yielded similar error statistics in analyses and forecasts, indicating that the developed OSSE system worked well.