Near real-time monthly mean 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:  1991-01-01T0000+00
    End:  2025-09-30T1800+00

Keywords

Resource Type dataset
Temporal Range Begin 1991-01-01T0000+00
Temporal Range End 2025-09-30T1800+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 -360 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 WMO GRIB2
Standardized Resource Format GRIB
Asset Size 283158.447 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, Japan
Publisher NSF National Center for Atmospheric Research
Publication Date 2024-05-01
Digital Object Identifier (DOI) https://doi.org/10.5065/CW01-2282
Alternate Identifier d640003
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress onGoing
Metadata Date 2025-10-09T01:46:05Z
Metadata Record Identifier edu.ucar.gdex::d640003
Metadata Language eng; USA
Suggested Citation Japan Meteorological Agency, Japan. (2024). Near real-time monthly mean Japanese Reanalysis for Three Quarters of a Century (JRA-3Q). NSF National Center for Atmospheric Research. https://doi.org/10.5065/CW01-2282. Accessed 25 October 2025.

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