Issue with running cmaq 5.2 after a few days the model stops

CMAQ Run Time Errors and Issues
1

Hi

I need a bit of help here with cmaq 5.2. My simulation runs for 9 days and then suddenly stops with the following the log file

Maximum eddy diffusivity of: 571.57 (m**2/sec)
at col, row, layer: 1, 14, 7
corresponding to a free tropospheric wind shear of: 4.43898E-04 (/sec),
a bulk Richardson Number of: -0.95315 ,
and pot. temps. in layer and layer+1: 292.88 292.88

SEDDY, MBAR, FNL, HOL = 1.14612430E-06 5.37949688E-07 0.139969930 -7.21724257E-02

 *** ERROR ABORT in subroutine VDIFFACMX on PE 201
 *** ACM fails ***

PM3EXIT: DTBUF 15:07:55 Jan. 9, 0013
Date and time 15:07:55 Jan. 9, 0013 ( 1:******)

Kindly assist anyone its urgent

Thanks

John

2

Errors that occur several days into a model run, due to specific meteorological conditions, are often difficult to diagnose. The error you are getting indicates a failure in the vertical mixing algorithm ACM2.
I notice that the date formatting indicates you are modeling air quality in the first century CE. Is that really what you are doing? That in and of itself would not cause an error in ACM2, but it may point to some other issue indicating data is getting garbled.
If you look at the results from the first few days of your model run, do they look reasonable?

3

No I am modelling it for 2017, the results for the first 9 days looks reasonable. Why is the date suddenly changing…

Here is another example

—>> WARNING in subroutine GET_EMIS:INTERPX
Variable “HGIIGAS” not in file EMIS_1
M3WARN: DTBUF 14:58:45 Jan. 10, 2017 (2017010:145845)

 >>--->> WARNING in subroutine GET_EMIS on PE 201
 Could not read HGIIGAS from EMIS_1
 M3WARN:  DTBUF 14:58:45  Jan. 10, 2017 (2017010:145845)


 Maximum eddy diffusivity of:   571.57     (m**2/sec)
 at col, row, layer:   1,  14,   7
 corresponding to a free tropospheric wind shear of:  4.43898E-04 (/sec),
                        a bulk Richardson Number of: -0.95315    ,
 and pot. temps. in layer and layer+1:   292.88       292.88

SEDDY, MBAR, FNL, HOL = 1.14612430E-06 5.37949688E-07 0.139969930 -7.21724257E-02

 *** ERROR ABORT in subroutine VDIFFACMX on PE 201
 *** ACM fails ***

PM3EXIT: DTBUF 15:07:55 Jan. 9, 0013
Date and time 15:07:55 Jan. 9, 0013 ( 1:******)

4

What is the synchronization time step being used at that point in your model run?

5

synchronization time step 150 that is 2.5 minutes

6

so is anyone able to assist on this? many thanks

7

I have fixed it - the ACM solver just needed a better error tolerance value in MBAR which can be found in src/acm folder to suit the modelling case.

8

Glad you were able to fix it. To potentially help other users, would you mind posting exactly what you changed?