branch or hybrid run using CLM4.5 in CESM1.2.1

[zichongchen22@gmail_com]

Hi,

I tried to use the compset CLM4.5 in CESM1.2.1 for a branch or hybrid run, but it doesn' work. When I tried to do cesm_setup, It shows that "rtm.buildnml.csh could not find restart file for branch or hybrid start". I think I should change RUN_REFCASE in env_run.xml, but I don't know how and where to put the restart file. Any one has some experience?

cheers,

Zichong

 

[zichongchen22@gmail_com]

Do you guys spin it up yourself or download it from somewhere?

 

[zichongchen22@gmail_com]

About the restart file. I know this is a rookie question. But I really want to know how you guys do with it? Spin it up yourself or download it from somewhere? Thx. Zichong

 

[santos]

I don't know about CLM specifically, but here is the documentation on setting up a hybrid/branch run:http://www.cesm.ucar.edu/models/cesm1.2/cesm/doc/usersguide/x1892.htmlThe restart files should go in the run directory ($RUNDIR). These files come from a previous model run (which can be one you do yourself or one someone else has done), since that's really the only reason to do a hybrid/branch run in the first place. If starting from an old case, I think that RTM can use CLM restart files, but I don't know what the requirements for that are.

 

[erik]

This was an issue that was fixed with cesm1.2.2. Try using the later version and you should be OK.

 

[esjiayu_bin@163_com]

I am currently using CESM1.2.1. I want to run a branch run from a old B_2000 run and I met the same problem. Can I fix it under version 1.2.1?Thanks.

 

[erik]

This is a known bug documented in this bug report.http://bugs.cgd.ucar.edu/show_bug.cgi?id=1777 The fix is shown as the first comment in the report.

 

[kezhoulumelody@gatech_edu]

Hi Erik, this method doesn't work for me. I try to build a newcase using hybrid run and reference case will be one of my restart file. I have already put the restar file in the $RUN directory, but I still got the same error: rtm.buildnml.csh could not find restart file for branch or hybrid start.
Thanks!
Melody

 

[kezhoulumelody@gatech_edu]

Btw, I am using cesm1.2.1 compset B1850CN and the resolution is f19_g16.

 

[Mengyao Xu]

Hi! I also encountered the same problem and getting the error "rtm.buildnml.csh could not find restart file for branch or hybrid start.". But I am using CESM1.2.2, and the compset is BRCP26C5CN. Even though I read the script of "rtm.buildnml.csh" and learned that RTM can use CLM restart file and have placed it in the run directory, I still get the error. Can anyone help or explain this? Thanks a lot!

 

[Cliff Chen]

Hi! I also encountered the same problem and getting the error "rtm.buildnml.csh could not find restart file for branch or hybrid start.". But I am using CESM1.2.2, and the compset is BRCP26C5CN. Even though I read the script of "rtm.buildnml.csh" and learned that RTM can use CLM restart file and have placed it in the run directory, I still get the error. Can anyone help or explain this? Thanks a lot!

You can get the restart files by running a startup case（you should set STOP_OPTION and STOP_N in env_run.xml), then cp them to the #CASEROOT/run where the case you build. I have succeed in CESM121,but I don't know if that is what you want.