Use ERA5 regrid files for FCnudge - Modifying IPT-master ERA5 code

[nuvolet]

What version of the code are you using?
CESM2.2.2, CAM6


Have you made any changes to files in the source tree?
Changes in nudging and CLM


Describe every step you took leading up to the problem:
I need to use ERA5 re-analisys files to nudge aerosols.

Describe your problem or question:

I made the necessary modifications in the IPT-master code (IPT/Meterological_Reanalysis_Data/Finite_volume_dycore/Gen_Data_f09/Gen_ERAI_fv09_001.01.csh at master · NCAR/IPT) to regrid ERA5.
Previosly I merged ERA5_YYYYMMDD_Np.nc and ERA5_YYYYMMDD_Nx.nc, because the new merged files will cantina u,v, T, q and PS to generate the regrid files I need for FCnudged compset (fv09 = 0.9x1.25).

Does anybody had to sue ERA5 in the FCnudged compset and successfully regrid the files.

Thanks

 

[nuvolet]

In the code in link above. The script Gen_ERAI_fv09_001.01.csh.
There is a line that calls some output grid structure and topography:

# Set files containig OUTPUT Grid structure and topography
#---------------------------------------------------------
set fname_grid_info        = '/glade/p/cesm/cseg/inputdata/atm/cam/inic/fv/cami-mam3_0000-01-01_0.9x1.25_L30_c100618.nc'
set fname_phis_output        = '/glade/p/cesmdata/cseg/inputdata/atm/cam/topo/fv_0.9x1.25_nc3000_Nsw042_Nrs008_Co060_Fi001_ZR_160505.nc'

I do not see those files in the path indicated.

Could somebody know where currently are those files?

Thanks in advance

 

[Danny Leung]

Hi Toni-
Look at
/glade/campaign/cesm/cesmdata/inputdata/atm/cam/inic/fv/
/glade/campaign/cesm/cesmdata/inputdata/atm/cam/topo/
and you will find the two files you want.
Danny

 

[nuvolet]

Hi Toni-
Look at
/glade/campaign/cesm/cesmdata/inputdata/atm/cam/inic/fv/
/glade/campaign/cesm/cesmdata/inputdata/atm/cam/topo/
and you will find the two files you want.
Danny

Hi Danny,

I found them.
Do you of any body who used the ERA5 regarded files from NCAR archive?.

Thanks

Cheers

Toni

 

[nuvolet]

From previous post above, I mentioned that I am using the NCL code available here Gen_ERAI_fv09_001.01.csh
In that script, the ERA5 files are defined as: ei.oper.an.ml.regn128sc.YYYYMMDDHH
Looking for those files I found this link:

2008 ERA Interim atmospheric model analysis on model levels​

Selecting all the ei.oper.an.ml.regn128sc.* files and then dowloading the csh script, it showing that:

wget --no-check-certificate -N https://osdf-data.gdex.ucar.edu/ncar/gdex/d627000/ei.oper.an.ml/200801/ei.oper.an.ml.regn128sc.2008010100 ...
--2025-10-06 10:22:04--  https://osdf-data.gdex.ucar.edu/ncar/gdex/d627000/ei.oper.an.ml/200801/ei.oper.an.ml.regn128sc.2008010100
Resolving osdf-data.gdex.ucar.edu (osdf-data.gdex.ucar.edu)... 128.117.251.130
Connecting to osdf-data.gdex.ucar.edu (osdf-data.gdex.ucar.edu)|128.117.251.130|:443... connected.
HTTP request sent, awaiting response... 301 Moved Permanently

While if clicking individually files can be downloaded.

Does anyone have used this link to use the ERA5 files?.
Thanks in advance

 

[nuvolet]

Looks that that particular data is located here:

/glade/campaign/collections/rda/data/d627000/ei.oper.an.ml/

 

[Danny Leung]

Hi Danny,

I found them.
Do you of any body who used the ERA5 regarded files from NCAR archive?.

Thanks

Cheers

Toni

Hi Toni-
I think certain people used ERA5 for nudging, and the most relevant point of contact should be Will Chapman.
If you are doing f09 runs then maybe this path gives you the nudging data (not sure if you have access):
/glade/campaign/cgd/amp/wchapman/Nudging_ERA5/fv_L32_ncl/
Talking to Will Chapman will help...
Danny

 

[nuvolet]

Hi Toni-
I think certain people used ERA5 for nudging, and the most relevant point of contact should be Will Chapman.
If you are doing f09 runs then maybe this path gives you the nudging data (not sure if you have access):
/glade/campaign/cgd/amp/wchapman/Nudging_ERA5/fv_L32_ncl/
Talking to Will Chapman will help...
Danny

Hi Danny,

I have access to that files.
Thanks a lot :)
Cheers

Toni

 

[nuvolet]

Hi Toni-
I think certain people used ERA5 for nudging, and the most relevant point of contact should be Will Chapman.
If you are doing f09 runs then maybe this path gives you the nudging data (not sure if you have access):
/glade/campaign/cgd/amp/wchapman/Nudging_ERA5/fv_L32_ncl/
Talking to Will Chapman will help...
Danny

Hi Dannys,

I am able to use those files and I am ready to make some run test for 2008.
I am also going to include your dust scheme in it.
Do you know if the dust_emiss_fact should be also assessed or using the 4,1 as in MERRA2 would enough?.
Thanks in advance

Cheers.

Toni

 

[Danny Leung]

Hi Toni-
As we discussed before, you can try a value (say, 4.1D0) and see if the grid area-weighted global mean of AODDUSTdn is about 0.03 in any year of the 2000s. If yes, then that value will be good.
In my experience, the dust_emis_fact for ERA5 and MERRA-2 are pretty much the same. But you can try it for yourself.
Danny

 

[nuvolet]

Hi Toni-
As we discussed before, you can try a value (say, 4.1D0) and see if the grid area-weighted global mean of AODDUSTdn is about 0.03 in any year of the 2000s. If yes, then that value will be good.
In my experience, the dust_emis_fact for ERA5 and MERRA-2 are pretty much the same. But you can try it for yourself.
Danny

Hi Danny,

I tried 4.1D0 and it works fine with this value.

Thanks

Toni