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As a subset of the Japanese 55-year Reanalysis (JRA-55) project, the
Meteorological Research Institute of the Japan Meteorological Agency
has conducted a global atmospheric reanalysis that assimilates only
conventional surface and upper air observations, with no use of
satellite observations, using the same data assimilation system as
the JRA-55. The project, named the JRA-55 Conventional (JRA-55C),
aims to produce a more homogeneous dataset over a long period,
unaffected by changes in historical satellite observing systems. The
dataset is intended to be suitable for studies of climate change or
multidecadal variability. The reanalysis period of JRA-55C is from
November 1972 to December 2012. The JMA recommends the use of JRA-55
to extend JRA-55C back to January 1958.
The Data Support Section at NCAR has downloaded all JRA-55C data.
The entire archive has been reorganized into single parameter time
series, and model resolution data has been transformed to a regular
Gaussian grid. The JRA-55C products are currently being made
accessible to RDA registered users of JRA-55, and will appear
incrementally via the Data Access tab.