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

ds628.9
| DOI: 10.5065/7WR1-VB85
 
Abstract:

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.

Temporal Range:
2020-01-01 00:00 +0000 to 2023-02-01 00:00 +0000 (Entire dataset) Period details by dataset product
Updates:
Monthly
Usage Restrictions:

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

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  • 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.

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(The complete JMA and NCAR agreement for JRA-55 may be viewed via the Documentation tab.)

Variables:
Air Temperature Atmospheric Heating Atmospheric Ozone Brightness Temperature
Canopy Characteristics Cloud Frequency Cloud Liquid Water/Ice Convergence
Dew Point Temperature Evaporation Evapotranspiration Geopotential Height
Gravity Wave Heat Flux Heat Flux Humidity
Hydrostatic Pressure Ice Extent Land Surface Temperature Land Use/Land Cover Classification
Longwave Radiation Potential Temperature Precipitation Amount Precipitation Rate
Runoff Sea Level Pressure Shortwave Radiation Soil Moisture/Water Content
Soil Temperature Streamfunctions Surface Pressure Surface Roughness
Surface Winds Total Precipitable Water Upper Air Temperature Upper Level Winds
Vegetation Species Vertical Wind Velocity/Speed Vorticity Water Vapor
GRIB parameter table: HTML | XML
Vertical Levels:
See the detailed metadata for level information.
Data Types:
Grid
Spatial Coverage:
Longitude Range: Westernmost=180W Easternmost=180E
Latitude Range: Southernmost=90S Northernmost=90N Detailed coverage information
Data Contributors:
JP/JMA
Japan Meteorological Agency, Japan
Publications:
Kobayashi, S., Y. Ota, Y. Harada, A. Ebita, M. Moriya, H. Onoda, K. Onogi, H. Kamahori, C. Kobayashi, H. Endo, K. Miyaoka, and K. Takahashi, 2015: The JRA-55 Reanalysis: General Specifications and Basic Characteristics J. Met. Soc. Jap., 93(1), 5-84 (DOI: 10.2151/jmsj.2015-001).

Onogi, K., J. Tsutsui, H. Koide, M. Sakamoto, S. Kobayashi, H. Hatsushika, T. Matsumoto, N. Yamazaki, H. Kamahori, K. Takahashi, S. Kadokura, K. Wada, K. Kato, R. Oyama, T. Ose, N. Mannoji, and R. Taira, 2007: The JRA-25 Reanalysis J. Met. Soc. Jap., 85(3), 369-342 (DOI: 10.2151/jmsj.85.369).

Total Volume:
53.42 GB (Entire dataset) Volume details by dataset product
Data Formats:
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More Details:
View a more detailed summary of the data, including specific date ranges and locations by parameter
Metadata Record:
Data License:
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