NCAR Climate Data Guide Content with Tag: 3DVAR

Climate Forecast System Reanalysis (CFSR)
Years of Record: 1979/01 to 2011/01
The CFSR is a third generation reanalysis product. It is a global, high resolution, coupled atmosphere-ocean-land surface-sea ice system designed to provide the best estimate of the state of these coupled domains over this period. The CFSR includes (1) coupling of atmosphere and ocean during the...
Main variables and Earth System components:
Formats: GRIB Timestep: Sub-daily,Monthly Domain: Global
ERA40
Years of Record: 1957/09 to 2002/08
ERA 40 is a second generation reanalysis. It is the first reanalysis to directly assimilate satellite radiance data (TOVS, SSM/I, ERS and ATOVS). Cloud Motion Winds are also used. The result is better circulation over the tropics and southern hemisphere. However, unless comparing  to previous...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Monthly Domain: Global
JRA-25
Years of Record: 1979/01 to 2004/12
JRA-25 is a second generation reanalysis product. The model and data assimilation are from the operational system in April 2004. It was the first reanalysis to assimilate wind profiles around tropical cyclones deduced from best-track data, resulting in improved tropical cyclone analysis in a global...
Main variables and Earth System components:
Formats: GRIB Timestep: Sub-daily,Monthly Domain: Global
NCEP NARR
Years of Record: 1979/01 to 2017/09
A high resolution (32km x 29 pressure levels) data set focused upon the North American Region. Relative to the NCEP-DOE (R2) it has a much improved land-hydrology, diurnal cycle and land-atmosphere interaction. As such, it can be considered a second generation reanalysis. A unique feature is the...
Main variables and Earth System components:
Formats: GRIB Timestep: Climatology,Sub-daily,Monthly Domain: North America
NCEP Reanalysis (R2)
Years of Record: 1979/01 to 2017/09
NCEP-DOE Reanalysis II (R2) is an improved version of the NCEP-NCAR Reanalysis I (R1). The improvements include an updated model with better physical parameterizations, assorted data assimilation errors were fixed and additional data were included. Still, it is still a 'first generation' product.
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
NCEP-NCAR (R1): An Overview
Years of Record: 1948/01 to 2017/09
NCEP-NCAR (R1) is the original reanalysis effort. It uses a frozen global state-of-the-art global data assimilation system (as of 11 January 1995). The original database was enhanced (additional, quality checked datasets) by NCAR's Data Support Section. Originally planned to span 1957-96 ("40-Year...
Main variables and Earth System components:
Formats: netCDF | GRIB Timestep: Sub-daily,Daily,Monthly Domain: Global
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