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

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. In JRA-3Q, the sea surface temperature (SST) specified as the lower boundary condition is the Centennial In Situ Observation-based Estimates of the Variability of SSTs and Marine Meteorological Variables Version 2 (COBE-SST2) with a resolution of 1 degree based on in situ observations until May 1985 and the Merged Satellite and In-Situ Data Global Daily Sea Surface Temperature (MGDSST) with a resolution of 0.25 degree based on satellite observations since June 1985. To enable evaluation of changes in product characteristics following the switch from COBE-SST2 to MGDSST, a sub-product using COBE-SST2 (JRA-3Q-COBE) is also provided for the period from June 1985 to December 1990.

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Temporal Range

  • Begin:  1985-06-01T0000+00
    End:  1990-12-31T2300+00

Keywords

Resource Type dataset
Temporal Range Begin 1985-06-01T0000+00
Temporal Range End 1990-12-31T2300+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 33135811.445 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 2024-10-09
Digital Object Identifier (DOI) https://doi.org/10.5065/RM7V-3X70
Alternate Identifier d640006
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2025-10-09T01:26:56Z
Metadata Record Identifier edu.ucar.gdex::d640006
Metadata Language eng; USA
Suggested Citation Japan Meteorological Agency, Japan. (2024). Japanese Reanalysis for Three Quarters of a Century - COBE (JRA-3Q-COBE). NSF National Center for Atmospheric Research. https://doi.org/10.5065/RM7V-3X70. Accessed 24 October 2025.

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