Based on this message in your main log file, you will need to look into the processor-specific log file for process 53, i.e. CTM_LOG_053*
application called MPI_Abort(MPI_COMM_WORLD, 1717896379) - process 53
As a reminder, looking for error messages in the processor-specific CTM_LOG files is one of the recommended steps listed in the CMAQ debug tutorial referenced in the Please click here to read tips before posting forum page when encountering crashes in your CMAQ run.