NCEP/NCAR Global Reanalysis Products, 1948-continuing

Products from NCEP/NCAR Reanalysis Project (NNRP or R1) are archived in this dataset. The resolution of the global Reanalysis Model is T62 (209 km) with 28 vertical sigma levels. Results are available at 6 hour intervals. Although the initial plan is to reanalyze the data for a 40-year period (1957-1996), production has gone back to 1948 and going forward continuously. Future plans call for rerunning the entire period as next generation models are ready. There are over 80 different variables, (including geopotential height, temperature, relative humidity, u- and v- wind components, etc.) in several different coordinate systems, such as 17 pressure level stack on 2.5 by 2.5 degree grids, 28 sigma level stack on 192 by 94 Gaussian grids, and 11 isentropic level stack on 2.5 by 2.5 degree grid. They are organized as different subgroups in the archive. In addition to analyses, diagnostic terms (for example: radiative heating, convective heating) and accumulative variables (like precipitation rate) are present. The input observations are archived with quality and usage flags in WMO BUFR format. Most of the project outputs are stored in WMO GRIB format. Other files, such as restart files and zonal statistics, are saved in IEEE format. Some special periods are analyzed more than once to provide data for special research studies. For example, a special run of 1979 was made excluding most satellite inputs. This run could be used for evaluating the impact of satellite data on the analysis. During the TOGA COARE experiment period, special runs of reanalysis model without experimental data are archived under the TOGA COARE directory. For details and problems, see NCEP/NCAR Reanalysis TOGA COARE. Monthly means are on line at ds090.2. The R1 forecasts are in ds090.1 dataset.

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Temporal Range

  • Begin:  1948-01-01T0000+00
    End:  2025-10-01T0600+00

Keywords

Resource Type dataset
Temporal Range Begin 1948-01-01T0000+00
Temporal Range End 2025-10-01T0600+00
Temporal Resolution N/A
Bounding Box North Lat 90.0
Bounding Box South Lat -90.0
Bounding Box West Long -180.0
Bounding Box East Long 180.0
Spatial Representation grid
Spatial Resolution 1.875 degree
2.5 degree
Related Links

Related Resource #1 : Description of the NCEP/NCAR (R1) Reanalysis at the NCAR Climate Data Guide

Related Resource #2 : NCEP/NCAR Reanalysis Project(CDAS)

Related Resource #3 : NCEP/NCAR Reanalysis Project Information
Additional Information N/A
Resource Format WMO BUFR
WMO GRIB1
Standardized Resource Format BUFR
GRIB
Asset Size 4251948.739 MB
Legal Constraints

Creative Commons Attribution 4.0 International License
Access Constraints None
Software Implementation Language N/A

Resource Support Name N/A
Resource Support Email datahelp@ucar.edu
Resource Support Organization N/A
Distributor NSF NCAR Geoscience Data Exchange
Metadata Contact Name N/A
Metadata Contact Email datahelp@ucar.edu
Metadata Contact Organization NSF NCAR Geoscience Data Exchange

Author National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce
Publisher NSF National Center for Atmospheric Research
Publication Date 1994-11-21
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier d090000
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress onGoing
Metadata Date 2025-10-09T01:46:51Z
Metadata Record Identifier edu.ucar.gdex::d090000
Metadata Language eng; USA
Suggested Citation National Centers for Environmental Prediction, National Weather Service, NOAA, U.S. Department of Commerce. (1994). NCEP/NCAR Global Reanalysis Products, 1948-continuing. NSF National Center for Atmospheric Research. https://gdex.ucar.edu/datasets/d090000. Accessed 24 October 2025.

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