JRA-55: Japanese 55-year Reanalysis, Near Real-Time Data -- Monthly Means and Variances

The Japan Meteorological Agency (JMA) conducted JRA-55, the second Japanese global atmospheric reanalysis project. It covers 55 years, extending back to 1958, coinciding with the establishment of the global radiosonde observing system. Compared to its predecessor, JRA-25, JRA-55 is based on a new data assimilation and prediction system (DA) that improves many deficiencies found in the first Japanese reanalysis. These improvements have come about by implementing higher spatial resolution (TL319L60), a new radiation scheme, four-dimensional variational data assimilation (4D-Var) with Variational Bias Correction (VarBC) for satellite radiances, and introduction of greenhouse gases with time varying concentrations. The entire JRA-55 production was completed in 2013, and thereafter will be continued on a real time basis. Specific early results of quality assessment of JRA-55 indicate that a large temperature bias in the lower stratosphere has been significantly reduced compared to JRA-25 through a combination of the new radiation scheme and application of VarBC (which also reduces unrealistic temperature variations). In addition, a dry land surface anomaly in the Amazon basin has been mitigated, and overall forecast scores are much improved over JRA-25. Most of the observational data employed in JRA-55 are those used in JRA-25. Additionally, newly reprocessed METEOSAT and GMS data were supplied by EUMETSAT and MSC/JMA respectively. Snow depth data over the United States, Russia and Mongolia were supplied by UCAR, RIHMI and IMH respectively.

To Access Resource:

Questions? Email Resource Support Contact:

  • datahelp@ucar.edu

Temporal Range

  • Begin:  2020-01-01T0000+00
    End:  2024-02-01T0000+00

Keywords

Resource Type dataset
Temporal Range Begin 2020-01-01T0000+00
Temporal Range End 2024-02-01T0000+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 1.25 degree
2.5 degree
Related Links

Related Resource #1 : JRA-55: Japanese 55-year Reanalysis

Related Resource #2 : Description of JRA-55 at the NCAR Climate Data Guide

Related Resource #3 : JRA-55 Quality Issues
Additional Information N/A
Resource Format WMO GRIB1
Standardized Resource Format GRIB
Asset Size 70746.73 MB
Legal Constraints

When accessing the JRA data, you agree to the following Terms and Conditions:

a. Conditions of use

   * Individual users must register their name, affiliation and email address with NCAR before access to datasets will be permitted.
   * The source of the datasets should be duly acknowledged in scientific and technical papers, publications, press releases and other communications regarding the datasets. Example: The dataset used for this study is from the Japanese 55-year Reanalysis (JRA-55) project carried out by the Japan Meteorological Agency (JMA).
   * Individual users should provide JMA (jra@met.kishou.go.jp) with a copy of their scientific or technical papers, publications, press releases or other communications regarding these datasets.

b. Disclaimer

   * Although JMA has taken the utmost care in creating the datasets, it assumes no responsibility regarding their reliability. JMA is not responsible for any damage that may result from their use.

c. Intellectual property

   * The intellectual property rights of the datasets belong exclusively to JMA.

(The complete JMA and NCAR agreement for JRA-55 may be viewed via the Documentation tab.)
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 2020-09-18
Digital Object Identifier (DOI) https://doi.org/10.5065/7WR1-VB85
Alternate Identifier d628009
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress onGoing
Metadata Date 2025-10-09T01:28:03Z
Metadata Record Identifier edu.ucar.gdex::d628009
Metadata Language eng; USA
Suggested Citation Japan Meteorological Agency, Japan. (2020). JRA-55: Japanese 55-year Reanalysis, Near Real-Time Data -- Monthly Means and Variances. NSF National Center for Atmospheric Research. https://doi.org/10.5065/7WR1-VB85. Accessed 11 October 2025.

Harvest Source