The implementation of chemical compilers was also discussed. Emissions The biggest hurdle for emission inventories is retrieving source level data bases. This data base could be updated every few years to capture the changing use of the land. However, the details, such as the location of the point sources, the plume heights, and the speciation of the chemical species, of the emissions are needed. This information is fairly well developed for North America, but is poorly characterized in other regions of the world.
More funding is needed to improve our emissions databases.
Biogenic emissions should be based on meteorology and should interact with the dry deposition parameterization. Episodic events, e.g., fires, should be included. Currently there are no emissions of chemical species in the WRF model. There needs to be consistency between the biogenic emissions, dry deposition, surface moisture, turbulence, and chemistry parameterizations in the description of the planetary boundary layer. Biogenic emissions from both vegetation and soil should be considered.