What species are included in the chemistry and what are the units for chemical, aerosols and emissions arrays?
The registry.chem file contains the names and dimensions of the chemical species used by the WRF/Chem model. The gas phase chemistry variables are in units of parts per million (ppm). The aerosol units are in mixing ratio (microgram of aerosol per kg of dry air). The 3-d variable “alt” (inverse density) should be included to the list of output variables in the registry.chem registry file if you desire to convert from mixing ratio to microgram/m3. This is done by dividing the desired aerosol variable or variables by “alt”. The chemical emissions are in units of mole per square kilometer per hour for the gaseous chemical species and microgram per square meter per second (microgram/(m^2 s)) for the aerosol species. The following is important if one wants to use your own biogenic emissions instead of the Gunther scheme. In module_bioemi_beis313.F, after the biogenic emissions are read into the model, a conversion factor which changes emissions from mole/km^2/hr to ppm is calculated. The 4.
