Hi Cmas users,
I am working on converting EDGAR and EDGAR-HTAP inventories into CMAQ-ready emission formats using the SMOKE system. However, when reviewing the inventories provided by EDGAR, I noticed that they offer both flx (fluxes) files and emi (emission) files.
I would like to understand the reason why the SMOKE system uses flx files and what the exact meaning of flx files is.
Thank you in advance for your assistance.
@Heomin. I am not quite sure the exact unit of your “flx” and “emi” files from your EDGAR-HTAP inventories but, SMOKE uses the emissions in the unit of kg/m2/sec from the EDGAR files. To convert these Lat/Lon projection EDGAR gridded emissions to your modeling domain, we need to regrid them based on MSFX2 (m2 of map-scale factor) from GRIDCRO2D file.
Hope this gives you an idea why we used the emission in unit of kgm/m3/sec.
Thank you for your kind response.
I understand that the unit of the flux files provided by EDGAR is kg/m²/s, while the unit of the emission files is ton/year.
However, I would like to know why the flux files (kg/m²/s) are used instead of the emission files (ton/year).
You need to use the emission flux values (kg/m2/sec) to properly regrid the EDGAR gridded emissions into another modeling domain with MSFX ratio dx*dy/true-Earth-area( cell ).
I thin it woul be best for you to review a routine called “genlgmat.f” located under …src/grdmat folder.
Follow the use of MSFX variable and you will see how the regridding are processed based on the type of map projections.