CMAQ-DMv.4.0.3 Sensitivity output during simulation becomes null value from a certain moment

Hello Anybody

I saw someone in the community reporting this issue, but it hasn’t been resolved(Issues with CMAQ-DDMv5.4 sensitivity output - #13 by bandaoshutiao). I believe this should be an occasional but real exist problem.

All concentration files are correct, and the logs have not reported any errors. However, one day after the simulation started, mine was on the 10th day, O3_ ANX starts from a certain grid point in the simulation domain to 0. As the simulation continued, after another 7 days, O3_ BCO also began to become zero. There are also issues with other variables. Given that there were no issues with the results at first few days of the simulation, I guess my model settings should not have been wrong.

Has anyone else encountered the same problem? Do you have any suggestions? Or can I send the file to you? @sergey


I have not been able to replicate this behavior on our local system here. Is there any way for you to share the INPUTS so that I may try your exact case? The best would be the smallest number of simulation days that start from clean initial conditions and progress in the the first occurrence of the problem.


Hi Sergey

Thank you for your attention and response to this question.
I shared my file on google drive, which includes scripts and input files.

The script runs as follows: csh xxx 20210530

I look forward to your reply very much. If you have any questions, please feel free to contact me at any time. @sergey


Arfter I change exe to 5.3.2,the error will be disappear. So, I guess some change have happened between and 5.3.2

Great! So your simulation proceeds normally with the newest code? Is that correct?


@sergey, no, unfortunately I think @bandaoshutiao is encountering the problem with the newest code (CMAQv5.4.0.3), but can avoid this specific problem when downgrading to CMAQv5.3.2.

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Hi Sergey and Christian,

I have successfully executed CMAQ/DDM v5.2 and CMAQ/DDM v5.4.0.3 and obtained satisfactory results. In my practices, other versions of CMAQ, including CMAQ 5.3.2 with the DDM-3D, do not appear to be fully functional.

CMAQ/DDM v5.4 exhibits significantly elevated higher-order sensitivities. However, these issues have been addressed and resolved in CMAQ v5.4.0.3, as seen here. I do not have the problem posted here in utilizing CMAQ v5.4.0.3 with DDM-3D.


I am also seeing same issue with the CMAQv5.4.0.3 model and still waiting for a right solution.

@sergey Hy Sergey, were you able to replicate the issue using the data provided above? Any suggestion would be highly appreciated.