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CLM input for Amip type run

R

rladlsdnjs88@gmail_com

New Member
Dear CESM experts,
Hello.I have performed the amip type run (F compset) .But I didn't set the Namelist about input file(initial file "finidat").I think that there is nothing wrong with my results.So I wonder how the soil temperature and the ground temperature is calcualted without setting the initial file(finidat) in F_AMIP_CAM5 compset.I will really appreciate if you can help me satisfy my curiosity.  Thanks in advance.Yours,Miss Kim.
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Hi Kim,It depends which resolution/dycore you use.For instance: if you run F_AMIP_CAM5 with:- with the Finite Volume (FV) dycore:  at f09_f09, your run will be set as an hybrid run. The initial conditions are coming from a previous 20th century coupled run.
In lnd_in, you will have: finidat = 'b40_20th_1d_b08c5cn_139jp.clm2.r.1979-01-01-00000.nc'- with the Spectral Element (SE) dycore: at ne30_ne30, your run will be set as a startup run. 
In a startup run, the components are initialized using baseline states. These baseline states are set independently by each component and can include the use of restart files, initial files, external observed data files, or internal initialization (i.e., a "cold start"). For isntance, at ne30_ne30:
finidat = '/glade/p/cesmdata/cseg/inputdata/lnd/clm2/initdata_map/clmi.BCN.0170-01-01_ne30np4_gx1v6_simyr1850_c121001.nc'

 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Hi Kim,It depends which resolution/dycore you use.For instance: if you run F_AMIP_CAM5 with:- with the Finite Volume (FV) dycore:  at f09_f09, your run will be set as an hybrid run. The initial conditions are coming from a previous 20th century coupled run.
In lnd_in, you will have: finidat = 'b40_20th_1d_b08c5cn_139jp.clm2.r.1979-01-01-00000.nc'- with the Spectral Element (SE) dycore: at ne30_ne30, your run will be set as a startup run. 
In a startup run, the components are initialized using baseline states. These baseline states are set independently by each component and can include the use of restart files, initial files, external observed data files, or internal initialization (i.e., a "cold start"). For isntance, at ne30_ne30:
finidat = '/glade/p/cesmdata/cseg/inputdata/lnd/clm2/initdata_map/clmi.BCN.0170-01-01_ne30np4_gx1v6_simyr1850_c121001.nc'

 
R

rladlsdnjs88@gmail_com

New Member
Thank you very much for your comment.I would like to ask you additionally. 1) Actually I want to perform the control run for seasonal prediction.I want to make sure if my experiment setting is scientifically appropriate as follows.In my experiment, I used F_AMIP_CAM5 compset, f05_f05(FV dycore), startup run. cam input : cami_1980-01-01_0.47x0.63_L30_c080813.nc docn file: sst_HadOIBl_bc_0.47x0.63_1850_2009_c101028.nc cice: sst_HadOIBl_bc_0.47x0.63_1850_2009_c101028.nc run time: 1980~2009clm input(finidat) : blank " " 2) As you mentioned, in startup run the components are initialized using baseline states and can include the use of restart files, initial file,external observed data files, or internal initialization.In case of my experiment,  I didn't set the FINIDAT in clm namelist (i.e. finidat = ' '),So, where does my case belong to among them in terms of clm? (Is it okay to blank FINIDAT in clm namelist?)I wonder how to calculate the variable associated with soil layer(soil moisture, soil temperature, ground temperature) without initial file or restart files. Thanks. Miss Kim 
 
R

rladlsdnjs88@gmail_com

New Member
Thank you very much for your comment.I would like to ask you additionally. 1) Actually I want to perform the control run for seasonal prediction.I want to make sure if my experiment setting is scientifically appropriate as follows.In my experiment, I used F_AMIP_CAM5 compset, f05_f05(FV dycore), startup run. cam input : cami_1980-01-01_0.47x0.63_L30_c080813.nc docn file: sst_HadOIBl_bc_0.47x0.63_1850_2009_c101028.nc cice: sst_HadOIBl_bc_0.47x0.63_1850_2009_c101028.nc run time: 1980~2009clm input(finidat) : blank " " 2) As you mentioned, in startup run the components are initialized using baseline states and can include the use of restart files, initial file,external observed data files, or internal initialization.In case of my experiment,  I didn't set the FINIDAT in clm namelist (i.e. finidat = ' '),So, where does my case belong to among them in terms of clm? (Is it okay to blank FINIDAT in clm namelist?)I wonder how to calculate the variable associated with soil layer(soil moisture, soil temperature, ground temperature) without initial file or restart files. Thanks. Miss Kim 
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Hi Kim,The setting for ncdata (the "cam input") and the SST is fine.I believe that when you set:
finidat=" "
the initial conditions that are set internally in the code but it takes a while for the land to spin up.
The land can take several decades to spin up, so if you start an AMIP run from a non spunup state tou would have to discard the beginning of the run.One way to go would be to interpolate the land initial conditiion from the 1 degree run to a 0.5 degree grid (using the tool interpinic).I am pointing your question to a land expert for extra details. Cecile 
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Hi Kim,The setting for ncdata (the "cam input") and the SST is fine.I believe that when you set:
finidat=" "
the initial conditions that are set internally in the code but it takes a while for the land to spin up.
The land can take several decades to spin up, so if you start an AMIP run from a non spunup state tou would have to discard the beginning of the run.One way to go would be to interpolate the land initial conditiion from the 1 degree run to a 0.5 degree grid (using the tool interpinic).I am pointing your question to a land expert for extra details. Cecile 
 
erik

erik

Erik Kluzek
CSEG and Liaisons
Staff member
The CLM User's guide talks about setting the finidat file. See http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/f184.html http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/x1230.html#setting_finidat http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/x11704.html Good luck  
 
erik

erik

Erik Kluzek
CSEG and Liaisons
Staff member
The CLM User's guide talks about setting the finidat file. See http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/f184.html http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/x1230.html#setting_finidat http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/x11704.html Good luck  
 
R

rladlsdnjs88@gmail_com

New Member
Thank you very much for your help.As you mentioned, without setting the finidat, clm could internally initialized. Is it right?So, I want to check that fortran code (or subrotine) associated with internal initialization of clm.I have already checked src code in clm. But, I didn't exactly know.Could you please let me know it ? Miss Kim
 
R

rladlsdnjs88@gmail_com

New Member
Thank you very much for your help.As you mentioned, without setting the finidat, clm could internally initialized. Is it right?So, I want to check that fortran code (or subrotine) associated with internal initialization of clm.I have already checked src code in clm. But, I didn't exactly know.Could you please let me know it ? Miss Kim
 
erik

erik

Erik Kluzek
CSEG and Liaisons
Staff member
When you finidat=' ' in your namelist, you use what is called "arbitrary initial conditions" in CLM. This means an isometric temperature profice set to the value at the surfce and soil moisture that is arbitrarily set to some mid-range value throughtout the column. Other temperatures like vegetation temperature are set to the surface value as well. Obviously, these are bad assumptions, and you'll need a lot of spinup time to get the soil column to equilibrate. If you are runnning with CN or BGC the soil carbon will take an espcially long time to equilibrate and you essentially are starting out with no vegetation. See my comments before, pointing you to documentation in the CLM User's Guide that tell you about spining up CLM.In the code the file responsible for this is called "mkarbinitMod.F90". For cesm1.2.0 that's under the directory: models/lnd/clm/src/clm4_0/main (replace clm4_0 with clm4_5 if you are using clm4_5 physics).
 
erik

erik

Erik Kluzek
CSEG and Liaisons
Staff member
When you finidat=' ' in your namelist, you use what is called "arbitrary initial conditions" in CLM. This means an isometric temperature profice set to the value at the surfce and soil moisture that is arbitrarily set to some mid-range value throughtout the column. Other temperatures like vegetation temperature are set to the surface value as well. Obviously, these are bad assumptions, and you'll need a lot of spinup time to get the soil column to equilibrate. If you are runnning with CN or BGC the soil carbon will take an espcially long time to equilibrate and you essentially are starting out with no vegetation. See my comments before, pointing you to documentation in the CLM User's Guide that tell you about spining up CLM.In the code the file responsible for this is called "mkarbinitMod.F90". For cesm1.2.0 that's under the directory: models/lnd/clm/src/clm4_0/main (replace clm4_0 with clm4_5 if you are using clm4_5 physics).
 
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