Assessing the Use of Satellite Observations in the NASA Modern Era Reanalysis for Research and Applications, Version-2 (MERRA-2)
While conventional and non-radiance satellite observations will be considered, a significant portion of this talk will focus on the use of satellite radiance observations. MERRA-2 incorporates core satellite observations from NASA, NOAA, and DoD satellites, beginning with the base of the TIROS Operational Vertical Sounder (TOVS) instruments and advancing through the Special Sensor Microwave/Imager (SSM/I), Advanced TOVS (ATOVS), and NASA Earth Observing System (EOS) periods. Per every six hour analysis, observation usage has grown from ~150,000 in the earliest period to having recently eclipsed 5 million observations. The behavior of these observations and the reaction of the system to these observations are being assessed and will be presented.