GRIB2_ECMWF_table

[odiaconu]

I am using AIFS from ECMWF model for verification in MET- 12. I did not find suitable tables for parameters
from the AIFS model, I mean the precipitation parameter. How could I use an
equivalent table? or add the parameter to the initial table?

[JohnHalleyGotway]

Hello @odiaconu, thanks for posting this discussion. I see that you're having difficulty reading GRIB2 data for the AIFS model properly into MET. Although I'm not actually familiar with AIFS myself, there's certainly no reason why MET shouldn't be able to handle its output. As you've already guessed, the likely culprit is just not having the metadata well-defined yet.

MET reads GRIB2 metadata from files named grib2*.txt found in https://github.com/dtcenter/MET/tree/main_v12.0/data/table_files.

And the grib2_ecmwf.txt file defines the metadata for ECMWF output. While we do frequently get user feedback about output from US-based models, we don't get much feedback about ECMWF data. So I'm really glad you reached out so we can improve our ECMWF support.

While the data/table_files directory provides the default GRIB1 and GRIB2 tables, the $MET_GRIB_TABLES (link to User's Guide) environment variable can be set to take precedence over those defaults. Please read through the description about that.

Ideally, we'd be able to create a new grib2_ecmwf_aifs.txt table to define the metadata for that model's output. You'd set export MET_GRIB_TABLES=/path/to/grib2_emcwf_aifs.txt and the MET tools would use those settings to interpret that data. Once you've confirmed it behaves properly, we could add those settings to the defaults for the next version of MET, version 12.1.0. With that new version, you'd no longer need to set $MET_GRIB_TABLES since it'd be included in the defaults.

So the big question is whether you ALREADY HAVE that table, perhaps formatted in a different way? If so, translating over for MET should be pretty straight-forward.

If possible, please create a tar/zip file with a sample AIFS output file along with the GRIB2 table that should be used to interpret it. And then just attach that tar/zip file to this discussion. And then I can take a closer look.

Thanks!

[odiaconu]

grib2_aifs.tar.gz

Hi John, as you suggested, I am attaching a tar.gz containing a grib2 file from the AIFS model, a "dump" with the metadata -
generated with eccodes tools, and the related tables used in eccodes. Thanks in advance for the suggestions.

[odiaconu]

Thank you very much, I just installed Met-12- correctly; I will try again tomorrow.