CNP Budget failure for a non-Jan starting run.

[bishtgautam]

Error reported by @kchong75

Hello, I was running E3SMv3.0.0 with a non-January starting month (e.g., 10), using the corresponding ELM restart file from a previous run (e.g., CASE.elm.r.0001-10-01.nc) as the initial dataset (finidat) for ELM. However, the CNPBudget fails its annual check for carbon state (net change in state >> time integrated flux) at the end of year, due to all annual beginning values being zeros. Below is the error message:

-----------------------------------------------------------------------|--------------------
                                                  *SUM*   382.70401574 |      3042037680.28
-----------------------------------------------------------------------|--------------------
 
 CARBON STATES (kgC/m2*1e6): period   annual: date =        20101           0
 
                                        beg              end          |        *NET CHANGE*
                    PFT                 0.00       4515692979.23      |      4515692979.23
                    CWD                 0.00          2368343.95      |         2368343.95
           Total litter                 0.00        413913580.76      |       413913580.76
              Total SOM                 0.00        836694905.52      |       836694905.52
     Total wood product                 0.00                0.00      |               0.00
        Truncation sink                 0.00            32479.12      |           32479.12
      Crop seed deficit                 0.00                0.00      |               0.00
         Grid-level Err                 0.00               -0.00      |              -0.00
----------------------------------------------------------------------|-----------------------
           *SUM*                      5768702288.59                   |      5768702288.59
 time integrated flux =    3042037680.27547     
 net change in state  =    5768702288.59410     
 current state        =    72.4916509223762     
 relative error [%]   =    47.2665163135523     
 ENDRUN:
 ERROR in CNPBudgetMod.F90 at line 929

Is there a way to fix this issue, or is it necessary to run the model starting from January? Thank you in advance for your help.

[kchong75]

Hi Gautam, thanks for opening this thread. Please see attached for two run scripts that can both reproduce the error.

1. Does not specify finidat: run_script.sh.txt
2. Specify finidat to a restart file from previous v3 run that starts from Jan 1st: bak.240322.run_script.sh.txt

[mahf708]

copying @rljacob --- I think we need non-jan tests in our test suites. An example, in the atmosphere (both eam and eamxx) we are often interested in runs starting say oct 1 or dec 1 with nudging. Because once nudged, we can afford ignoring the first month in a simulation, then we end up with a nice whole year left for analysis from a 15-month or 13-month run. The two scream sensitivity campaigns are 13-month-long pairs

[ndkeen]

Noting an issue that had same error mesg: https://github.com/E3SM-Project/E3SM/issues/6230

[bishtgautam]

@kchong75 Please give PR-#6405 a try.