nudging data grid

[TCNasa]

How do I tell CESM the grid parameters of the target data I want to use for nudging? There is a mismatch problem:

print*,'Mismatch ',Nudge_nlon,nlon
print*,'Mismatch ',Nudge_nlat,nlat
print*,'Mismatch ',plev,pver


Mismatch 288 576
Mismatch 192 361
Mismatch 42 32


ERROR: nudging_update_analyses_fv: analyses dimension mismatch

 

[TCNasa]

Can you nudge a compset of one resolution with data from another resolution?
How can I use MERRA2 data for nudging if my compset wants 0.9x1.25 data?

 

[TCNasa]

Let me simplify the question. Does the resolution (vertical and horizontal) of my nudging data need to match the compset used for starting the model?

 

[altuntas]

Can you provide more context? What is/are your target component(s)?

 

[TCNasa]

Currently I have been trying to run either FCSD or FCnudged compsets with nudging from "pre-gridded" MERRA2 data from NCAR which is already on the 0.9x1.25 grid used by my CESM. I am trying to process resolution f09_f09_mg17. The problem is that MERRA2 has 72 levels but FCSD and FCnudged use either 56 or 32 I think. I was told that the code can resolve this difference but so far it doesn't

 

[TCNasa]

However, now I hear that I do need to run the same number of levels for nudging data as the CESM data. Someone mentioned an IC file, but I don't know what that is.

 

[altuntas]

I am mentioning folks who may have more info on this. @cacraig @hannay

 

[cacraig]

I have been reaching out via email to our nudging experts for all of your nudging posts, but so far I have not received a response from them. I pinged them again.

 

[TCNasa]

Thanks for trying

 

[patc]

FCSD /FCnudged implement nudging in the FV dycore, which should not be confused
with physics-side nudging which is applicable for all dycores (including FV). There is some
documentation of its use at:
wiki.ucar.edu/display/camchem/Meteorology.

 

[Xiaoyun W]

I have the same problem as you.
MERRA2 has 72 levels but my target compset need 32 levels . Do I need to interpolate in the vertical?
Can you tell me how you solved this problem?Any help will be appreciated.

 

[nuvolet]

I have the same problem as you.
MERRA2 has 72 levels but my target compset need 32 levels . Do I need to interpolate in the vertical?
Can you tell me how you solved this problem?Any help will be appreciated.

Here CISL RDA: MERRA2 Global Forcing data for CESM2 Applications you can find the MERRA2 files in 32 levels.

 

[Xiaoyun W]

Here CISL RDA: MERRA2 Global Forcing data for CESM2 Applications you can find the MERRA2 files in 32 levels.f

Thank you.l found it

 

[Emma.axe]

Hi! I have a similar problem but for the FWSD compset.

ERROR: nudging_update_analyses_fv: nlon= 288 Nudge_nlon= 288
ERROR: nudging_update_analyses_fv: nlat= 192 Nudge_nlat= 192
ERROR: nudging_update_analyses_fv: plev= 72 pver= 88
ERROR: nudging_update_analyses_fv: analyses dimension mismatch

I'm assuming the error is because FWSD has 88 levels and MERRA2 only have 72 levels?

Are there any pre-made scrips for changing the levels or do you know where I can find MERRA2 with 88 levels?

Any help would be much appreciated