JRA-25 Atlas

JRA-25 Atlas

The Japan Meteorological Agency (JMA) and the Central Research Institute of Electric Power Industry (CRIEPI) jointly conducted the Japanese 25-year Reanalysis (JRA-25) project for five years from 2001. Quality-controlled observational data from past decades and the latest numerical assimilation and prediction technology were used to produce a long-term record of the state of the atmosphere. The reanalysis covers the 26-year period from 1979 to 2004, and provides consistent and high-quality data. The JRA-25 product is widely used for research on meteorology and climatology, as well as for operational climate monitoring and seasonal forecasting.

Maps of annual, seasonal and monthly averaged climate fields of various meteorological variables from the JRA-25 products have been archived as the JRA-25 Atlas. We hope that the Atlas will be widely used for research and education.

Contents of JRA-25 Atlas

Elements or projections Maximum and minimum values
Surface orography and vegetation
Surface climatologies
Pressure, wind, temperature
Precipitation, snow depth, tropical cyclone
Cloud cover, soil water content
Column climatologies
Heating, water vapor, ozone
Pressure level climatologies
Latitude-longitude projections (wind, vertical velocity, absolute vorticity and divergent wind, stream function and velocity potential)
Polar stereographic projections (geopotential height, isotachs, temperature, kinetic energy)
Latitude-height cross sections (zonal wind, temperature, potential temperature, vertical velocity, northward flux of momentum or heat)
Isentropic level climatologies
Latitude-longitude projections, latitude-height cross sections (pressure, wind, stream function and velocity potential, zonal wind)
Polar stereographic projections (isotachs and Montgomery potential, potential vorticity, pressure, wind)
PV=2 climatologies
Potential temperature, pressure, wind
Time series
Height-time cross sections, indices (zonal wind, MJO index, SOI)
Time-longitude cross sections, latitude-time cross sections (zonal wind, velocity potential)
Tropical cyclone days



Credit of the JRA-25 Atlas

The source of the JRA-25 Atlas should be duly acknowledged in papers, publications, press releases or other communications regarding the Atlas.


The JRA-25 Atlas data used for this study are provided from the cooperative research project of the JRA-25 long-term reanalysis by the Japan Meteorological Agency (JMA) and the Central Research Institute of Electric Power Industry (CRIEPI).

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Numerical Prediction Division, Information Infrastructure Department
Japan Meteorological Agency