How to add a new namelist to cesm1_2_0

[songfengfei@lasg_iap_ac_cn]

I am running cesm1_2_0 and want to add a new namelist to pop2_in, but I can't add it. As the tutorial says, if we add a new namelist variable to the existing namelist, the best way is using user_nl_pop2. However, how to add a new namelist and define some new variables in the new namelist. Finally, I find a way to do this: I copy a build_namelist and namelist_definition_pop2.xml to src.pop2 and add the new namelist in these two files. It is okay to build and run but some errors appear as following:
build-namelist - ERROR: No default value found for sstf_file_name
user defined attributes:
Died at /WORK/home/LASG30/songfengfei/cesm_script/hist1_ep_5yr/SourceMods/src.pop2/build-namelist line 1875.
ERROR: pop2.buildnml.csh failed
ERROR: /WORK/home/LASG30/songfengfei/cesm_script/hist1_ep_5yr/preview_namelists failed: 25344

Are these warnings of vital? Do you have a betetr way to add a new namelist in the cesm1_2_0.
Any suggestions will be appreciated.

 

[hannay]

If pop2.buildnml.csh failed, it means that you haven't build the namelist. So this is not going to work.

 

[santos]

I'm not positive how the POP build-namelist works, but I think that, if you are defining entirely new namelist variables, you are probably better making a copy of the source code tree and modifying that code, rather than putting the modifications in SourceMods.

 

[njn01]

Please see the POP2 FAQ for instructions on how to add a new pop2 namelist with new namelist variables:http://www.cesm.ucar.edu/models/cesm1.2/pop2/doc/faq/#dev_newnamelistFollow steps 1 and 2, then either step 3.1 or 3.2.  I suspect that all you will need to do is step 3.1 in order to get your case to work.You are definitely on the right track with your attempts. I strongly recommend that you make the modifications in your $CASE/SourceMods/src.pop2 directory, as you have done, rather than modifying the pop2 base code.

 

[songfengfei@lasg_iap_ac_cn]

Thanks very much for your reply. This thanks are later for more than one year since I can't log into the forum when I am in China. Now I am a post-doc in the UCSD. With your help, this issue is solved perfectly.