Problems running Transient Simulations (GPP = 0)

[sjc265@cornell_edu]

Hi CLM/CESM community,I am trying to run CESM 1.2.2 simulations with the I20TRCLM45BGC compset.  When I run it out of the box for 1 month, the simulation completes.  But GPP and plant N demand end up being 0.  I tried copying the file located at models/lnd/clm/doc/UsersGuide/co2_streams.txt into glade/scratch/userid/NewCase/run, but that didn't change anything.  Any thoughts on how to troubleshoot would be much appreciated!Thanks,Susan

 

[sjc265@cornell_edu]

I was getting GPP = 0 because my case was unable to read in the transient CO2 streams file.  The steps below allowed me to correctly read in the file with CO2 levels. If you are having a similar problem, detailed instructions are found at:http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/x12702.htmlFor me, I also needed to do the following:After copying the addco2_user_nl_datm.user_nl file into my case directory and renaming it user_nl_datm, I opened user_nl_datm and added a quote before the last "nomask" in the line: mapmask = 'nomask','nomask','nomask','nomask', nomask'After copying the streams text file (datm.streams.txt.co2tseries) to my case's run directory, I changed the lines with:$CSMDATA/atm/datm7/CO2/to/glade/p/cesmdata/cseg/inputdata/atm/datm7/CO2