sensitivity experiment about the circulation response to the anomalous soil moisture in the specific region

[Cliff Chen]

Hello all:
I was trying to modulate the response of the circulation to the anomalous soil moisture in a specific region in CAM6. I found that there is a variable (atm_in) that may contains the soil data (clim_soilw_file), so, I changed the prescribed soil moisture in it and ran two cases (Positive and Negative). However, the response of the circulation in the two cases are same, indicting no anomalous signals were added in. I also checked the (atm.log.xxxx) file, there is no sign that the cases invoking the (clim_soilw_file), despite is was written in the (atm_in).
I'm not sure the process I adopted is right, or anyone knows how to run such a sensitive experiment.
Thanks in advance~

 

[slevis]

@Cliff Chen I'm not familiar with the file that you mentioned. There may be a way to prescribe the soil moisture that I'm not aware of.

Otherwise though, the land model simulates soil moisture as explained in the clm technical note:

2.7. Hydrology — ctsm release-clm5.0 documentation

escomp.github.io

You would need to come up with a way to overwrite (or nudge or whatever you have in mind) the simulated soil moisture.

 

[Cliff Chen]

@Cliff Chen I'm not familiar with the file that you mentioned. There may be a way to prescribe the soil moisture that I'm not aware of.

Otherwise though, the land model simulates soil moisture as explained in the clm technical note:

2.7. Hydrology — ctsm release-clm5.0 documentation

escomp.github.io

You would need to come up with a way to overwrite (or nudge or whatever you have in mind) the simulated soil moisture.

Thanks a lot! I'll check it.

 

[oleson]

This post might be of help also:

Any tips on setting surface soil moisture as climatology at each time step at a specific domain in CLM

Hi everyone, I am going to carry out an experiment setting surface soil moisture as prescribed values at a specific domain. It is very similar to the Pacific pacemaker experiment which is usually applied in POP. I know how to modify on POP, but I am kind of new to CLM. Are there any documents...

bb.cgd.ucar.edu

 

[Cliff Chen]

This post might be of help also:

Any tips on setting surface soil moisture as climatology at each time step at a specific domain in CLM

Hi everyone, I am going to carry out an experiment setting surface soil moisture as prescribed values at a specific domain. It is very similar to the Pacific pacemaker experiment which is usually applied in POP. I know how to modify on POP, but I am kind of new to CLM. Are there any documents...

bb.cgd.ucar.edu

Thanks very much for your reply! Oleson. It seems that I have solved the issue following the method. it will be confirmed after running more cases.
Sorry to disturb you, I came up with another question. I was wondering is there a file that contains the prescribed snow-covered fraction or any other variables about snow cover (As far as I understand, the variable SFC is used in the CLM according to the User's guide), so that, I can change the data in the specific month and region. Or, the SFC is just used in the initial field for the RUN_STARTDATE?
Thanks in advance!

 

[slevis]

There is no file containing prescribed snow-cover fraction and - off the top of my head - I do not recognize the variable name SFC that you mention.

 

[Cliff Chen]

There is no file containing prescribed snow-cover fraction and - off the top of my head - I do not recognize the variable name SFC that you mention.

Thanks very much for your reply! slevis. so, there is no prescribed variables about snow cover for the initial field which can only be got from the output data. Is that right?

 

[oleson]

I probably don't understand your question, but there are snow fields on the initial file that you use to start your simulation. The file is prescribed by finidat in your lnd_in. That just initializes the snowpack, after that, the model prognoses snow cover.