Chaning namelist during run

[tomas]

Hi,

I ran cam3 for 20 years and saved a couple of variabiles at daily resolution.

Now I want to save more variables at daily resolution.

So I changed fincl2 in the namelist and ran for 20 years. Many GAU's later
it looks like these changes were ignored. Is this normal CAM3 behavior?

How do I go about getting addtional variables at daily resolution?

Thanks.

Bob

 

[tomas]

I got answers to my questions and thought I should post them so that others
may avoid the mistake I made.

You can change fincl2 in the namelist and restart the model. And CAM3 will
run, but it *won't* take into acount any changes you made. And it won't
give you a warning that the namelist has been changed but its ignoring
those changes.

Ces't la vie.

In order to change variables output to a file, you need to do a branch.

Thanks Matthew for your help.

Bob

 

[eaton]

The User's Guide states (section 2.4.2):

Namelist variables other than NESTEP, NELAPSE, and NSREST should never be modified for restart runs.
​

Actually any namelist variable that sets the new stop time is OK, so STOP_YMD and STOP_TOD should be included in that list.

I agree that the documentation could be improved to make this information easier to find.

 

[tomas]

I see that now Brian,

Thanks for the clarification.

By the way, when I try and search the CAM users guide for keywords
I *know* appear in the document, for example, namelist, fincl2,
I am told that the word is not found. I guess the search capability
is broken? Or maybe I'm not using it correctly?

Bob

 

[eaton]

I also noticed that the search capability of the html version of the User's Guide is broken. I downloaded the pdf version and searched it using acroread.

 

[mysonu82@gmail_com]

i am presently using climatological sst values for running cam3.0 for about a year .. and i have successfully done the initial as well as restart runs....

now that i want to run the original sst that is observed ...so plz do tell me what is the right way out...
Abhishek

 

[rneale]

Abishek,

Climo and observed SST CAM runs are performed in the same way.
You only have to change two namelist variables and perform an initial run

1. Swap out the sst file for the 'bndtvs' namelist variable
2. Make sure 'sstcyc' is set to .FALSE.

This is in the CAM Users' Guide
http://www.ccsm.ucar.edu/models/atm-cam/

And CAM/CCSM input data is available from the Earth System Grid
https://www.earthsystemgrid.org/

Thanks
RIch