A SIMULATED FUTURE ATMOSPHERIC OBSERVATION DATABASE INCLUDING ATOVS, ASCAT, AND DWL

A database for study of the impact of Doppler wind lidar data on numer ical weather prediction in Observation System Simulation Experiments w as created. Five Doppler wind lidar scenarios, TIROS Operational Verti cal Sounder, Advanced TIROS Operational Vertical Sounder, Advanced Sca tterometer, and all conventional observation types with a realistic di stribution in time and space have been successfully simulated. A 30-da y run of the ECMWF forecast model was used as a physically sound refer ence state. This ''true'' atmospheric state was sampled at the observa tion positions and times. The simulated true variables were mapped ont o the ''measured'' variables, and a mix of random and gross errors wit h realistic statistical characteristics was added. The simulated obser vations were validated by comparison with existing data where availabl e.