ERROR: Stopping because of EBI convergence failures

CMAQ Run Time Errors and Issues
1

Dears,
I’m using CMAQv5.2.1 and my simulation fails with the error:

ERROR: Max number of EBI time step reductions exceeded
Convergence failure for cell ( 23, 11, 1)
Convergence failure for the following species:Init.Conc, Pred.Conc.
NO2 1.0000E+03 1.0000E+03 ppmV
NO 4.3570E+03 4.3570E+03 ppmV

*** ERROR ABORT in subroutine HRSOLVER on PE 000
ERROR: Stopping because of EBI convergence failures
PM3EXIT: DTBUF 0:00:00 Dec. 31, 2009

The error appeared in run.cctm log file; however in CTM.log files there were no ERROR messages. The meteorology input data came from WRFv3.9.1.1

Thank you.

2

Can you please tell me more about the case you are running - spatial domain, time period and the source of your inputs. Once I know a little more I can better direct your question to the appropriate team member. Thanks!

3

Dear Foley,

It seems we are facing a similar issue if you think you ca help.

We are running ISAM CCTM with CMAQv5.0.2. for India at a resolution of 36x36 grids for source apportionment. It runs for 8 hr and 12 mins and stops. With the following error.

"ERROR: Max number of EBI time step reductions exceeded
Convergence failure for cell ( 23, 12, 1)
Convergence failure for the following species:
NO2
NO
NO3
OH
N2O5
PNA
ROR
CRNO

 *** ERROR ABORT in subroutine HRSOLVER on PE 027
 ERROR: Stopping because of EBI convergence failures

ERROR: Stopping because of EBI convergence failures"

The model starts running with 4x7=28 cores in parallal mode and stops. On checking, we found that values of AOTHRj species (of total and all contributing sectors) go extraordinarily high in the range of E18. The problem starts with the first timestep itself when AOTHRj values go very high and at the 8th hour simulation stops with this error.

However, when we run the model with only 1 core, the model keeps working with some high values in AOTHRj in totals but not in SA_ACONC files.

We checked, emission files used are working fine with normal cctm mode but shows up this error when tried out in ISAM.

Look forward to your suggestions.

Thanks

Best regards

Sumit

4

Please try compiling the code in debug mode to see if the convergence failure goes away.

5

Hi,
I encountered the same error as you. I wonder if you solved the problem. If so, could you share the solution with me?
Thanks!
Lin

6

Hi Lin,
Please submit a new ticket using the Best Practices listed on the following link.
Please use the latest release of CMAQv5.3.3, not CMAQv.5.2.1

Thank you,
Liz