DIAS Japanese 25-year ReAnalysis (JRA-25)

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. Period reanalyzed: from Jan. 1979 to Dec. 2004 (26 years) Global model resolution : T106L40 (model top: 0.4hPa) Data assimilation : 3D-Var Numerical assimilation system : JMA's operational system of April 2004. In addition, SSM/I PW, and TOVS radiance level 1c (SSU) and 1d (HIRS, MSU) were assimilated.