Soil-moisture nudging experiments in CESM2

[kwzhang]

Hi,
I am trying to nudge soil moisture to climotology in F2000climo in CESM2. I only found the Nudging Experiment example (U, V, T, Q) in CAM6.3 User guide. How can I perform a Soil-moisture nudging experiment? I think this experiment should be based on the CLM%, but I haven't found any introduction about the nudging experiment in CLM User guide.

 

[oleson]

I'm not aware of any nudging capability in CLM. But there is an option to prescribe soil moisture. See this post for information:

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

 

[oleson]

Another possibility is to make use of DART, which may have the capability to assimilate soil moisture:

DART | The Data Assimilation Research Testbed

DART is a community facility for ensemble DA developed and maintained by the Data Assimilation Research Section (DAReS) at the National Center for Atmospheric Research (NCAR).

dart.ucar.edu

 

[kwzhang]

I'm not aware of any nudging capability in CLM. But there is an option to prescribe soil moisture. See this post for information:

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

Hi Oleson,
Thank you for your reply! It is a good hint for me to start!

 

[kwzhang]

I'm not aware of any nudging capability in CLM. But there is an option to prescribe soil moisture. See this post for information:

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

Hi Oleson,
I designed a case which will run for one year in F2000climo in CESM2. The resoluton is set as f09_f09_mg17.
Following your suggestion, I only set "use_soil_moisture_streams = .true. ". I got the following error in the file lnd.log.7104048.231027-181639:
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
(shr_dmodel_readstrm) open : /BIGDATA2/app/CESM_inputdata_2/inputdata/lnd/clm2/prescribed_data/LFMIP-pdLC-SST.H2OSOI.0.9x1.25.20levsoi.natveg.1980-2014.MONS_climo.c190716.nc
(shr_dmodel_readstrm) file lb: /BIGDATA2/app/CESM_inputdata_2/inputdata/lnd/clm2/prescribed_data/LFMIP-pdLC-SST.H2OSOI.0.9x1.25.20levsoi.natveg.1980-2014.MONS_climo.c190716.nc 12
(shr_dmodel_readstrm) file ub: /BIGDATA2/app/CESM_inputdata_2/inputdata/lnd/clm2/prescribed_data/LFMIP-pdLC-SST.H2OSOI.0.9x1.25.20levsoi.natveg.1980-2014.MONS_climo.c190716.nc 1
Input soil moisture dataset is not vegetated as expected: gridcell= 1
active = T
ENDRUN:
ERROR:
('PrescribedSoilMoistureInterp') ERROR:: The input soil moisture stream is NOT
vegetated for one of the land points
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
Any hints would be helpful! Thanks in advance!
Best,
Kaiwen

 

[slevis]

I haven't used this capability to be of much help, but does the error message

('PrescribedSoilMoistureInterp') ERROR:: The input soil moisture stream is NOT
vegetated for one of the land points

make sense to you? Seems the code is expecting vegetation or maybe at least bare soil in a grid cell and not finding it?

@oleson may have more insight when he looks at this later in the week.

 

[oleson]

The soil moisture stream file is specific to the simulation configuration it was created from. In this particular case, it was created and used by a LS3MIP prescribed soil moisture simulation (f.e21.FHIST_SSP126.f09_f09_mg17.CMIP6-lfmip-pdLC.001). So it's likely to only be fully functional in that configuration. The capability was added to CLM as an example of how a prescribed soil moisture simulation could be run. So you will need to generate your own soil moisture file using your particular configuration, following the example file provided.

 

[kwzhang]

I haven't used this capability to be of much help, but does the error message

('PrescribedSoilMoistureInterp') ERROR:: The input soil moisture stream is NOT
vegetated for one of the land points

make sense to you? Seems the code is expecting vegetation or maybe at least bare soil in a grid cell and not finding it?

@oleson may have more insight when he looks at this later in the week.

Dear slevis,
Thank you so much for your help. I agree with your nice suggestion. t is a good hint for me to start.
Best,
Kaiwen

 

[kwzhang]

The soil moisture stream file is specific to the simulation configuration it was created from. In this particular case, it was created and used by a LS3MIP prescribed soil moisture simulation (f.e21.FHIST_SSP126.f09_f09_mg17.CMIP6-lfmip-pdLC.001). So it's likely to only be fully functional in that configuration. The capability was added to CLM as an example of how a prescribed soil moisture simulation could be run. So you will need to generate your own soil moisture file using your particular configuration, following the example file provided.

Dear Oleson,
Thank you for your reply. My case is just similar to the LS3MIP prescribed soil moisture simulation. So I think the soil moisture file used in the LS3MIP prescribed soil moisture simulation is OK!
I know that CESM2 completed the LS3MIP prescribed soil moisture simulation. Is the soil moisture file used in the LS3MIP prescribed soil moisture simulation available? Can I download this file from the website? By the way, is the soil moisture example file you mentioned the one used in the LS3MIP prescribed soil moisture simulation or the file LFMIP-pdLC-SST.H2OSOI.0.9x1.25.20levsoi.natveg.1980-2014.MONS_climo.c190716.nc?
Any hints would be helpful! Thanks in advance!
Best,
Kaiwen