| Summary: | Progress Code: completed Maintenance and Update Frequency: asNeeded Statement: ERA-40 2.5° by 2.5° reanalysis archive containing primary (4-times daily GRIB) and processed (4-times daily and climatological netCDF)data. Credit Australian Greenhouse Office (part of the Australian Climate Change Science Program). Tan Lee (Bureau of Meteorology)transferring GRIB files from the BMRC to the CSIRO disk. CSIRO/BMRC HPSC managing the archive. Harvey Davies’ Credit NAP extension (http://sourceforge.net/projects/tcl-nap) of TCL provided the ability to convert GRIB files to netCDF files, as well as form monthly and seasonal climatologies of all time-varying parameters. Credit Mark Collier Credit ECMWF(European Centre for Medium-Range Weather Forecasts). ERA-40 2.5° by 2.5° reanalysis archive containing primary (4-times daily GRIB) and processed (4-times daily and climatological netCDF)data. The atmospheric model used for ERA-40 has the identifier IFS CY23r4 and is comprehensively documented on the ECMWF website at http://www.ecmwf.int/research/ifsdocs/CY23r4/index.html. It has 60 levels in the vertical, uses a T159 spherical-harmonic representation for the dynamical fields, and a reduced Gaussian grid with an approximately uniform 125 kilometre spacing for surface and other grid-point fields. An essential part of the ERA-40 activity was the production of an archive of data in GRIB format. Parameters such as the 4-times daily surface and pressure level files were processed to produce COARDS conforming netCDF files which are self describing, machine transperant and which employ a similar metacode specification to that in the NCEP re-analysis files. This makes it possible for users of the NCEP/NCAR reanalysis to be able to easily switch data input to ERA-40. Only the 4-times daily GRIB files have been further processed and are on a 2.5 by 2.5 degree horizontal grid (144 by 73 regular grid points) for each of the standard 23 pressure levels (0001, 0002, 0003, 0005, 0007, 0010, 0020, 0030, 0050, 0070, ...
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