I am using cmaq5.3.1 and cb6r3_ae7_aq mechanism. Recently I am learning process analysis of ozone concentration. But there are some problems with the results. From the IPR output file, DDEP contributes a lot to ozone as shown below. But the ozone concentration is ~30 ppb. the contribution of other processes is very small above the vertical layer. I am not sure whether this is correct. Any comments would be appreciated!
Thanks very much for your help!
Thanks for posting these results.
Yes, the very large and mostly counteracting DDEP and VDIF contributions for layer 1 are expected. Dry deposition is only active at the surface so it only has a non-zero contribution in layer 1, and a large portion of the removal of O3 through that process is counteracted by downward mixing of ozone into layer 1 through VDIF such that the net effect / sum of all IPR terms (i.e. the net rate of change for O3) is on the order of a few ppb/hr like it is for the higher layers in your plot.
Your profile for contributions in the layers up to 3 km seems consistent with some IPR analyses we included in a paper a few years ago (see Section 3.1.2 and Figures 4-5), though of course the actual magnitudes will depend on the specific domains and time periods being simulated and analyzed.