Japanese 25-year Reanalysis Project
Entry ID: NCAR_DS625.0

[ Update this Record ]

Summary
Abstract: The Japanese 25-year Reanalysis (JRA-25) represents the first long-term global atmospheric reanalysis undertaken in Asia. Covering the period 1979-2004, it was completed using the Japan Meteorological Agency (JMA) numerical assimilation and forecast system and specially collected and prepared observational and satellite data from many sources including the European Center for Medium-Range Weather Forecasts (ECMWF), the National Climatic Data Center (NCDC), and the Meteorological Research Institute (MRI) of JMA. A primary goal of JRA-25 is to provide a consistent and high-quality reanalysis dataset for climate research, monitoring, and operational forecasts, especially by improving the coverage and quality of analysis in the Asian region. In JRA-25, three-dimensional variational (3D-Var) data assimilation and a global spectral model were employed to produce 6-hourly atmospheric analysis and forecast cycles. The global spectral model was based on a 320 by 160 (~1.125 degree) Gaussian grid with T106 truncation. Vertical discretization employed a hybrid sigma-pressure coordinate utilizing 40 levels where 0.4 hPa represents the model top level. A predictive mass-flux Arakawa-Schubert scheme was utilized for cumulus parameterization, and Simple Biosphere (SiB) parameterizations for land-surface processes. Assimilated variables include temperature, relative humidity, and surface pressure from conventional observations, and also winds retrieved from geostationary satellites, radiative brightness temperature from TIROS Operational Vertical Sounder (TOVS), and precipitable water from Special Sensor Microwave/Imager (SSM/I). Variables not directly assimilated include daily sea surface temperature (SST) and sea ice based on Centennial in-situ Observation-Based Estimates (COBE), and ozone profiles based on chemical transport models constrained by observations from Total Ozone Mapping Spectrometer (TOMS). The JRA-25 shows marked improvement over previous reanalyses in several notable areas, especially predicted (both 6-hourly and long term) precipitation, with more realistic variability and fewer spurious trends due to contamination of satellite data by volcanic eruptions. JRA-25 is also the first reanalysis to assimilate wind profiles around tropical cyclones deduced from best-track data, resulting in improved tropical cyclone analysis in a global context. In addition, low-level (stratus) cloud decks along the western subtropical coasts of continents are also better simulated, improving radiation budgets in these regions. In 2006, JMA started real-time operation of the JMA Climate Data Assimilation System (JCDAS). JCDAS employs the same system as JRA-25 and the data assimilation cycle is extended to the present time. JRA-25 and JCDAS products will enable users to conduct climate diagnostics with a long-term, and current, homogeneous reanalysis dataset. The JMA has also engaged in ongoing cooperation with ECMWF (European Center for Medium-Range Weather Forecasts) on reanalysis, including the ECMWF CDAS (ECDAS), more commonly known as ERA-Interim.

Related URL
Link: VIEW RELATED INFORMATION


Link: VIEW RELATED INFORMATION


Link: VIEW RELATED INFORMATION
Description: Outline of the Operational Numerical Weather Prediction at the Japan Meteorological Agency


Link: VIEW RELATED INFORMATION
Description: Japanese 25-year ReAnalysis (JRA-25) and JMA Climate Data Assimilation System (JCDAS)


Link: VIEW RELATED INFORMATION
Description: Description of the JRA-25 at the NCAR Climate Data Guide


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
Dataset Title: Japanese 25-year Reanalysis Project
Dataset Publisher: UCAR/NCAR/CISL/DSS > Data Support Section, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research
Online Resource: http://rda.ucar.edu/datasets/ds625.0/


Temporal Coverage
Start Date: 1979-01-01
Stop Date: 2014-02-01


Science Keywords
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >HYDROSTATIC PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >STREAMFUNCTIONS    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >POTENTIAL TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >DEW POINT TEMPERATURE    [Definition]
ATMOSPHERE >ALTITUDE >GEOPOTENTIAL HEIGHT    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >VORTICITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >PRECIPITABLE WATER    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >VERTICAL WIND MOTION    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >ATMOSPHERIC STABILITY    [Definition]
CRYOSPHERE >SEA ICE >SNOW DEPTH    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION RATE    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >CONVERGENCE/DIVERGENCE    [Definition]
ATMOSPHERE >PRECIPITATION >SOLID PRECIPITATION >SNOW    [Definition]
CRYOSPHERE >SEA ICE >SNOW MELT    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >EVAPOTRANSPIRATION    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >RUNOFF    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SURFACE PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >HEAT FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >GRAVITY WAVE    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE TEMPERATURE >MAXIMUM/MINIMUM TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >SHORTWAVE RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >LONGWAVE RADIATION    [Definition]
BIOSPHERE >VEGETATION >CANOPY CHARACTERISTICS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ATMOSPHERIC HEATING    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW WATER EQUIVALENT    [Definition]
OCEANS >OCEAN TEMPERATURE >SEA SURFACE TEMPERATURE    [Definition]
LAND SURFACE >SURFACE THERMAL PROPERTIES >LAND SURFACE TEMPERATURE    [Definition]
LAND SURFACE >SOILS >SOIL MOISTURE/WATER CONTENT    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW DEPTH    [Definition]
LAND SURFACE >SOILS >SOIL TEMPERATURE    [Definition]
ATMOSPHERE >AIR QUALITY >TROPOSPHERIC OZONE    [Definition]
LAND SURFACE >TOPOGRAPHY >SURFACE ROUGHNESS    [Definition]
OCEANS >SEA ICE >ICE EXTENT    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD LIQUID WATER/ICE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Access Constraints
Must be a registered user of JRA-25. If you are not a registered user of JRA-25, you will be given the opportunity to do so when you click the data access tab. Files with embedded "subc60" in file name indicate GRIB1 files which have corrected model grid metada encoded. Please also note that the read password has been dropped for all MSS (Mass Storage System) files as of 2008-01-08.


Use Constraints
(1) The datasets are to be used only for research purposes. (2) Users cannot edit the JRA-25 datasets and then claim they are official products. (3) Users are explicitly not permitted to redistribute the JRA-25 to third parties, including derived products such as filtered time series, fields not originally part of JRA-25, etc. (4) JMA does not accept liability for any resulting damage caused by the use of the JRA-25 datasets. (5) Users are obligated to duly acknowledge the JRA-25 in all scientific or technical papers, publications, press releases or other communications regarding the datasets. (6) Users are obligated to provide the JMA with a copy of their scientific or technical papers, publications, press releases or other communications regarding the datasets. The recommended acknowledgement statement for publication is, "The datasets 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)."


Keywords
REANALYSIS MODELS
JRA25 > JMA Japanese 25-year Reanalysis


Data Set Progress
IN WORK


Data Center
Research Data Archive, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research    [Information]
Data Center URL: http://rda.ucar.edu/
Dataset ID: 625.0

Data Center Personnel
Name: RDA HELP DESK
Phone: (303)-497-1231
Fax: (303)-497-1291
Email: rdahelp at ucar.edu
Contact Address:
National Center for Atmospheric Research
CISL/DSS
P.O. Box 3000
City: Boulder
Province or State: CO
Postal Code: 80307
Country: U.S.A.



Distribution
Distribution_Size: 19.107 Tbytes

Distribution_Format: GRIB1 > GRIdded Binary form, Edition 1


Personnel
DAVE STEPANIAK
Role: TECHNICAL CONTACT
Phone: (303)-497-1343
Fax: (303)-497-1291
Email: davestep at ucar.edu
Contact Address:
National Center for Atmospheric Research
CISL/DSS
P.O. Box 3000
City: Boulder
Province or State: CO
Postal Code: 80307
Country: U.S.A.


CHI-FAN SHIH
Role: TECHNICAL CONTACT
Phone: (303)-497-1833
Fax: (303)-497-1291
Email: chifan at ucar.edu
Contact Address:
National Center for Atmospheric Research
CISL/DSS
P.O. Box 3000
City: Boulder
Province or State: CO
Postal Code: 80307
Country: U.S.A.


BOB DATTORE
Role: DIF AUTHOR
Phone: (303)-497-1825
Fax: (303)-497-1291
Email: dattore at ucar.edu
Contact Address:
National Center for Atmospheric Research
CISL/DSS
P.O. Box 3000
City: Boulder
Province or State: CO
Postal Code: 80307
Country: U.S.A.


Publications/References
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), 369-432, URL: http://www.jstage.jst.go.jp/article/jmsj/85/3/85_369/_article.

Creation and Review Dates
Last DIF Revision Date: 2015-03-05

[ Update this Record ]


Link to Web Site