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CDO supports GRIB2 but needs the GRIB_API library from ECMWF in order to work correctly. If you find the CDO commands below do not work, you can either build CDO yourself, making sure a recent version of grib_api is used, or you can use a workaround below. Use the grib_set command (from the grib_api installation) to change the GRIB edition number for all messages. Note this will only work if you are using less than 128 model levels and it does not actually convert the message to GRIB1 if there are any GRIB2 specific elements in the messages.
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grib_set -s editionNumber=1 <input grib2 file> <output grib1 file> |
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Note this will only work if you are using less than 128 model levels and it does not actually convert the message to GRIB1 if there are any GRIB2 specific elements in the messages. |
CDO can be used to interpolate from the reduced Gaussian grid to a regular Gaussian grid (model resolutions T21 & T42 use a regular Gaussian grid)
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