I am a new learner of CMAQ and i use the latest CMAQ-5.3.1 version. I am now rerunning one of my senior’s simulation and got the emission input data directly from her. She is using CMAQ-5.0.2 and SMOKE-4.0. So the emission data i got is generated using SMOKE-4.0 and the chemical mechanism is cb05. But in CMAQ-5.3.1 the cb05 chemical mechanism is updated to cb6. Could i use the emission inventory directly? Do i need to regenerate the emission input data myself because of the update of the chemical mechanism?
a-pinene needs to be split from other monoterpenes (TERP) if using aero7 (highly recommended over aero6). See require emission updates here: https://github.com/USEPA/CMAQ/blob/master/DOCS/Release_Notes/aero7_overview.md. This update is important for PM2.5 performance and failing to split out APIN will result in overestimates in PM2.5 (particularly in vegetated locations).
This does not cover updates that may be needed for gas-phase chemistry (Ramboll/Environ may have documentation as well as the CMAS wiki covering updates since v5.0.2).
I use CMAQ5.3.1 and CMAQ5.2.1, and try to map emission of cb5ae5 to cb6ae6 or cb7ae7. I tried to find the coefficients to convert each old emission species into new emission species, but failed. Have you converted the old emission into new emission species?
Please see the attached Emission Control File which should roughly map cb05tucl_ae5_aq to the cb6r3_ae7_aq mechanism. The file format itself should be compatible with CMAQv5.3.1.
There still may be hiccups. I made suggestions on how to solve potential crashes in comments within the file. Let me know if you get stuck. Be sure to change the extension from .txt to .nml.