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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Questions? Email Resource Support Contact:

  • Dave Stepaniak
    davestep@ucar.edu
    NSF NCAR - Geoscience Data Exchange

Temporal Range

  • Begin:  1991-01-01T00:00:00Z
    End:  2025-08-31T18:00:00Z

Keywords

Resource Type dataset
Temporal Range Begin 1991-01-01T00:00:00Z
Temporal Range End 2025-08-31T18:00:00Z
Temporal Resolution N/A
Bounding Box North Lat 90
Bounding Box South Lat -90
Bounding Box West Long -180
Bounding Box East Long 180
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 0.00 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 Dave Stepaniak
Resource Support Email davestep@ucar.edu
Resource Support Organization NSF NCAR - Geoscience Data Exchange
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 2025-10-03T01:21:04Z
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 04 October 2025.

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