Hi all,
I would like to ask a question directly associated with PM2.5 calculation in CMAQv5.4 cb6r5AERO7. While there is additional output file from CCTM under CMAQv5.4 that directly give PM related concentrations, there is not any details in COMBINE directory that descrbes how PM2.5 are calculated in CMAQv5.4 cb6r5AERO7 mechanism. For users who would like to conduct source attribution of PM2.5 with cb6r5AERO7 mechanism, we must know the equation for calculating PM2.5 and PM10 because CMAQv5.4-ISAM (CCTM_SA_ACONC file) does not directly output PM2.5 and PM10.
Is the equation calculating PM2.5 in cb6r5AE7 the same as cb6r3AE7 (which we could find the quation in COMBINE under CMAQv5.3.3)?
Moreover, may I ask how could we calculate speciated components of PM0.1 by CMAQv5.4-ISAM?
Thanks for pointing this out. Yes, we should have connected some of these dots.
In order to calculate PM2.5, you can use the same equations applicable in v5.3.3. The main thing to confirm is to make sure you have included all of the organic species.
To get PM0.1, you can add “FPM01” to the ELMO interface and use that to multiply each component offline. However, it should be output by default to the ELMO file (i.e. when the string ‘DEFAULT’ is used.)
In the future, we will expand the ELMO module to print PM2.5 (or PM0.1, etc) directly for ISAM sources. Will this largely solve your issue (eventually)?
Hello, everyone!
I am encountering some issues while using CMAQ-5.3.2 for a simulation (two levels of domains). The PM2.5 concentration appears to be discontinuous, as if it is restarting every day. In fact, my CCTM parameters are set to output results once a day, and both my ICON and BCON files are also configured to generate output daily. For the second domain of ICON/BCON, I am using the modeling results from the first domain.
I have uploaded the relevant documents for your review. Thank you for your attention.
The icon and bcon run scripts you posted show that instead of pointing to fine (9 km) MCIP files for the MET_CRO_3D_FIN (icon) and MET_BDY_3D_FIN (bcon) environment variables that define the structure for the target grid, they instead point to the (coarse) 27 km MCIP files.
It would help if you could post the icon, bcon, and CCTM log files for both domains to confirm that this is indeed the cause of your problem. I am not quite sure why the CCTM simulation for domain 2 would not run into any arrays issues if the perimeter provided in the (likely erroneous) BCON file doesn’t match the perimeter implied by the GRIDDESC file, unless the number of columns and rows matches across both domains.
Thank you, sir. I appreciate your explanation.
My settings are ROW = 77, COL = 99 for the first domain (27 km), and ROW = 108, COL = 123 for the second domain (9 km). The ICON, BCON, and CCTM log files have been uploaded for your review.
Sorry, I can only upload 5 files at a time. I’ll upload the other log files next time.
Thank you again. bcon-XiXian-D01.txt (53.2 KB) bcon-XiXian-D02.txt (32.6 KB) icon-XiXian-D01.txt (51.6 KB) icon-XiXian-D02.txt (29.3 KB)
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