Daily wind cycling error in MOM6 ocean-only idealized model

[Mark360s]

Hi! I want to set wind stress with 3 months of variability as input data in the MOM6 ocean-only idealized model, but I found it is constant without varying... could anyone help me with this issue? Thanks!
The tau_mag output (show as constant):

My input data showed below:

Also, my configuration setting:
! Surface forcing
BUOY_CONFIG = "zero" ! read buoyancy forcing from the file
WIND_CONFIG = "file" ! read wind forcing from the file
WIND_FILE = "wind.nc" ! the file in which the wind stresses are found
WINDSTRESS_X_VAR = "STRESS_X" ! the name of the x-wind stress variable in WIND_FILE
WINDSTRESS_Y_VAR = "STRESS_Y" ! the name of the y-wind stress variable in WIND_FILE

WIND_STAGGER = "A" ! how the wind stress components are staggered in WIND_FILE
RESTOREBUOY = False ! the buoyancy fluxes drive the model back toward some specified surface state
! with a rate given by FLUXCONST
DT_FORCING = 86400 ! s-1, time step for changing forcing (1 day)

[marshallward]

I think this is you, right?

https://bb.cgd.ucar.edu/cesm/threads/ocean_only-configuration-of-regional-mom6-reads-atmospheric-forcing-only-at-initial-time.7043/post-55355

Should we move the discussion over there? It also might help to open a new topic (with the same helpful figure).

[marshallward]

For what it's worth: I'm not sure why this isn't working for you, in which case it may be a bug. If that is the case, we can move the issue to https://github.com/NOAA-GFDL/MOM6/issues

[marshallward]

There is a parameter VARIABLE_WINDS in MOM_input which may need to be set. Do you have this on? (Default is true, but you can check in MOM_parameter_doc.all).

[Mark360s]

Dear Marshall, Yes, I have definitely set this parameter as ‘true’, which means wind stress varying over time. It also not shows unused in mom.err file. In addition, I have looked into the details of MOM6 source code and feel confused about unused of 'nlev' configuration parameter... Thanks so much for your help, still try to solve this problem. All the best Heng All the best Heng

…

________________________________ From: Marshall Ward ***@***.***> Sent: Friday, 10 May 2024 4:57 To: NOAA-GFDL/MOM6-examples ***@***.***> Cc: Heng Xu ***@***.***>; Author ***@***.***> Subject: Re: [NOAA-GFDL/MOM6-examples] Daily wind cycling error in MOM6 ocean-only idealized model (Issue #452) There is a parameter VARIABLE_WINDS in MOM_input which may need to be set. Do you have this on? — Reply to this email directly, view it on GitHub<#452 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/A2EKSQWBUFY65TPYOQUZOALZBPBKFAVCNFSM6AAAAABHOGHBQWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMBTGI2DANJVGU>. You are receiving this because you authored the thread.Message ID: ***@***.***> This email is confidential, and is for the intended recipient only. Access, disclosure, copying, distribution, or reliance on any of it by anyone outside the intended recipient organisation is prohibited and may be a criminal offence. Please delete if obtained in error and email confirmation to the sender. The views expressed in this email are not necessarily the views of the University of Tasmania, unless clearly intended otherwise.

[Mark360s]

For what it's worth: I'm not sure why this isn't working for you, in which case it may be a bug. If that is the case, we can move the issue to https://github.com/NOAA-GFDL/MOM6/issues

I don't really know whether it is the bug, but there is no obvious error I could find leading to this problem...

[Mark360s]

Hi! To catch what I have found:

The input data could only be read with 365 days, less or more days will make the MOM6 ocean-only model read wind stress as a constant defaultly. To derive wind stress variability with 3 months effect, I chose to save model output every 360 days, then it worked well.

All the best
Heng

[marshallward]

Thanks for the update. While I haven't tried this myself, it does sound like very unusual behavior. I'll close this issue and continue the conversation at NOAA-GFDL/MOM6#631.