Transcript JRA-25 and JCDAS at NCAR

JRA-25 and JCDAS at NCAR
Data from Japanese 25-year Reanalysis (JRA-25) and the operational followon JMA Climate Data Assimilation System (JCDAS) are managed as a
component of the CISL Research Data Archive (RDA)
Chronology of events
• October 2007, agreement reach to distribute JRA-25 from NCAR
• January 2008, began data services to general users
– Details at dss.ucar.edu/news/jra25.html
• September, 2008 agreement to distribute JCDAS
– Operational continuation of JRA-25 is critical for placing today’s weather events
into the climate context
JRA-25/JCDAS adds to the suite of major reanalyses in the RDA
– E.g. ECMWF ERA-40, NCEP/NCAR Reanalysis
Features of JRA-25/JCDAS at NCAR
• All data users are registered and must agree to JMA’s ‘Condition of Use’
• Prepared to share user registration metrics with JMA enabling a combined
worldwide dataset impact assessment
• Currently, about 317 registered users
Access to JRA-25/JCDAS at NCAR
All data available through web/RDA portal and NCAR MSS, 11 TB
• Available dates, 1979 though 2007
• 23 different data products
– 4 x daily, GRIB1 format
– Monthly mean, netCDF (NCAR derived from binary) format
JRA-25/JCDAS Data User Metrics (Jan.- Sep., ‘08)
Domain
Users
Files (K)
Amount (TB)
NCAR
12
7
8.7
Web/RDA portal
44
11
0.8
Total
56
18
9.5
Excellent cooperation between members of CISL and JMA staff allows
comprehensive access to JRA-25/JCDAS products at NCAR