ERROR bounding bracket for pH solution not found CESM BGC B1850 compesite

[Redlichia]

Hi, Thanks for opening this thread.

I am running fully coupled simulation (use B1850 compesite) with CESM1_2_2. The ocean tracer module is set to "iage ecosys" for this simulation. The control experiment has worked successfully for 1500 years. In the control simulation for the PI period, the atmospheric CO2 concentration is 280 ppm.
When I doubled the atmospheric CO2 concentration (set atm_co2_const = 560 in the user_nl_pop2), the experiment ran for a few years with an error.
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Here is the last few lines from cesm.log:
(co2calc.F90:drtsafe_row) i_glob = 19 , j_glob = 88 , k =
1 , nsteps_run = 282733 , it = 4
(co2calc.F90:drtsafe_row) x1,f = 2.249672977453864E-011
1.796657834997200E-004
(co2calc.F90:drtsafe_row) x2,f = 3.565491387230262E-008
4.016122913191166E-007
(shr_sys_abort) ERROR: bounding bracket for pH solution not found
(shr_sys_abort) ERROR: bounding bracket for pH solution not found
(shr_sys_abort) WARNING: calling shr_mpi_abort() and stopping
(shr_sys_abort) WARNING: calling shr_mpi_abort() and stopping
Abort(1001) on node 42 (rank 42 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, 1001) - process 42
Abort(1001) on node 43 (rank 43 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, 1001) - process 43
------------------------------------------------------------------------
I also checked the ocn.log file, but didn't find the source of the problem.
Attached is my cesm.log and ocn.log file.
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I tried two solutions:

1. increase the step size in the user_nl_pop2 by setting dt_count = 26;
2. setting xndt_dyn=2 in user_nl_cice.

Both of these solutions, after running the same error again, didn't fix the bug.
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I would like to ask if anyone has any good solutions or can you tell me where the problem occurs?
I really hope to get your help!

Best,
Chen

 

[Notos]

Hi, Yihui! Have you solved the problem? I have encountered the same problem. Thank you !

 

[Redlichia]

Hi, Yihui! Have you solved the problem? I have encountered the same problem. Thank you !

Hi, Huang!

You can use both methods to try to resolve the bug.

1. increase the step size in the user_nl_pop2 by setting dt_count = 26;
2. setting xndt_dyn=2 in user_nl_cice.

Best,
Chen

 

[Notos]

Hi, Chen!
I have modified dt_count=26 and xndt_dyn=2, while the error still remains. 感谢陈老师的回复！

Best wishes,
Huang