Japanese Reanalysis for Three Quarters of a Century (JRA-3Q)

JMA is currently conducting the Japanese Reanalysis for Three Quarters of a Century (JRA-3Q), which covers the period from September 1947 onward to extend the current period of data coverage and improve the quality of long-term reanalysis. The project involves a sophisticated data assimilation system (based on the operational set-up as of December 2018) incorporating development results from the operational NWP system and sea surface temperature analysis achieved since JRA-55 (based on the operational set-up as of December 2009). New datasets of past observations are also assimilated, including rescued historical observations and reprocessed satellite data supplied by meteorological and satellite centers worldwide. Many of the deficiencies of JRA-55 are alleviated in JRA-3Q, providing a high-quality homogeneous reanalysis dataset that covers the previous 75 years.

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Temporal Range

  • Begin:  1947-09-01T0000+00
    End:  2025-09-30T2300+00

Keywords

Resource Type dataset
Temporal Range Begin 1947-09-01T0000+00
Temporal Range End 2025-09-30T2300+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 0.375 degree
1.25 degree
Related Links

Related Resource #1 : Japanese Reanalysis for Three Quarters of a Century (JRA-3Q)
Additional Information N/A
Resource Format NetCDF4
Standardized Resource Format NetCDF
Asset Size 470823296.318 MB
Legal Constraints

Creative Commons Attribution Non Commercial Share Alike 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 Japan Meteorological Agency
Publisher NSF National Center for Atmospheric Research
Publication Date 2023-10-11
Digital Object Identifier (DOI) https://doi.org/10.5065/AVTZ-1H78
Alternate Identifier d640000
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress onGoing
Metadata Date 2025-10-22T20:18:49Z
Metadata Record Identifier edu.ucar.gdex::d640000
Metadata Language eng; USA
Suggested Citation Japan Meteorological Agency. (2023). Japanese Reanalysis for Three Quarters of a Century (JRA-3Q). NSF National Center for Atmospheric Research. https://doi.org/10.5065/AVTZ-1H78. Accessed 31 October 2025.

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