Hi everyone. I’m working on comparing CMAQv5.3.1 results with another model developed by our own group. As our model uses our own emission inventory, we wrote program to generate emission files that could be read by CMAQ. After running two models, I found that CMAQ results were significantly different from our model results. To figure out how the differences came, previously I’ve asked how to turn off chemistry mechanism in CMAQ. But the differences still existed. My next step is to turn off transport and advection in CMAQ and only allow emissions being read and mixed. Could anyone tell me how to do that? Thanks!
Since emissions is tangled up with vertical diffusion, that won’t be easy…
Is there any easy alternative way to do that? For example, can I force CMAQ to read the horizontal wind fields as all zeros?
May I ask if you have solved this problem? I have encountered a similar problem too.
Whether or not a species is transported is controlled via the TRNS column of the associated species namelist, e.g., GC_cb6r5_ae7_aq.nml.
I am not sure whether a species that is not transported can be emitted, or whether those emissions will be ignored. It should be possible to discern what is happening from the log file and/or a DESID emissions diagnostic file.