The CFSR was executed as global, high resolution, coupled atmosphere-ocean-land surface-sea ice system. It includes coupling of atmosphere and ocean during the generation of the 6 hour guess field, an interactive sea-ice model and assimilation of satellite radiances by the Grid-point Statistical Interpolation scheme over the period 1979 to 2009 (ref. CFSR overview). Additional improvements are: the high horizontal and vertical resolution of the atmosphere (T382L64), assimilation improvements over the last 10-15 years and the use of prescribed CO2 concentrations as a function of time.
CFSR is free of several inadequacies found in NCEP-R1 and R2 such as artificial changes introduced by ingesting data from constantly changing observational platforms or the constant CO2 of 330ppmv, rendering CFSR more useful for climate change studies. CFSR is more accurate than NCEP-R1, while it includes analises of both the ocean and sea-ice with higher resolution in space and time.
CFSR employs the analysis systems:
- operational Global Data Assimilation System (GDAS)
- atmospheric GADAS- Gridded Statistical Interpolation (GSI)
- ocean-ice GODAS
- land GLDAS
Atmospheric Model: operational Global Forecast system (GFS)
Ocean Model: MOM4 Ocean (GFDL Modulal Ocean Model)
Land Model: operational Noah Land Model
Sea Ice model: from the GFDL Sea Ice Simulator