Hi,
I'm using the era5_to_int.py tool to process downloaded ERA5 pressure-level (pl) and surface (sfc) NetCDF (.nc) data into intermediate files for subsequent metgrid preprocessing.
According to my colleague’s experience using ERA5 GRIB (.grb) data, only the pl and sfc datasets are required. However, when I use era5_to_int.py with the .nc data, I receive error messages indicating that model-level (ml) data and two types of invariant data are also needed—one corresponding to the study period and another to January 1979.
I obtained these datasets from the following directories:
ml data and first invariant data:
/glade/campaign/collections/rda/data/d633006/e5.oper.an.ml/202308/
/glade/campaign/collections/rda/data/d633006/e5.oper.invariant/
second invariant data (per the instructions on this webpage):
https://gdex.ucar.edu/datasets/d633000/filelist/40/?fl=glade.
After downloading all of these files, I successfully generated intermediate files (prefixed with “ERA5-”) using the following command:
era5_to_int.py -p /glade/derecho/XXXXXXXX -i 2023-08-20_00 2023-08-28_00 1
As the -i indicates the processing of pressure-level data (not model levels). I was able to generate the metgrid data successfully, though I haven’t yet tested them in WRF.
My question is:
Are the ml and invariant data indeed required when using ERA5 .nc files as forcing data? Is this requirement due to differences between the .nc and .grb data formats, or did I make an error in my processing steps?
Thank you very much for your help!
Cheers,
Henry
I'm using the era5_to_int.py tool to process downloaded ERA5 pressure-level (pl) and surface (sfc) NetCDF (.nc) data into intermediate files for subsequent metgrid preprocessing.
According to my colleague’s experience using ERA5 GRIB (.grb) data, only the pl and sfc datasets are required. However, when I use era5_to_int.py with the .nc data, I receive error messages indicating that model-level (ml) data and two types of invariant data are also needed—one corresponding to the study period and another to January 1979.
I obtained these datasets from the following directories:
ml data and first invariant data:
/glade/campaign/collections/rda/data/d633006/e5.oper.an.ml/202308/
/glade/campaign/collections/rda/data/d633006/e5.oper.invariant/
second invariant data (per the instructions on this webpage):
https://gdex.ucar.edu/datasets/d633000/filelist/40/?fl=glade.
After downloading all of these files, I successfully generated intermediate files (prefixed with “ERA5-”) using the following command:
era5_to_int.py -p /glade/derecho/XXXXXXXX -i 2023-08-20_00 2023-08-28_00 1
As the -i indicates the processing of pressure-level data (not model levels). I was able to generate the metgrid data successfully, though I haven’t yet tested them in WRF.
My question is:
Are the ml and invariant data indeed required when using ERA5 .nc files as forcing data? Is this requirement due to differences between the .nc and .grb data formats, or did I make an error in my processing steps?
Thank you very much for your help!
Cheers,
Henry