During the mid-1990's, the Sparse-Matrix Operator Kernel Emissions System was designed to provide efficiently computed meteorology-modulated atmospheric chemistry emissions for EPA's "Models-3" and other air quality modeling systems, including MAQSIP, UAM-IV, UAM-V, and CMAQ, using a wide-variety of speciations common to current and future-generation chemical mechanisms.

The authors have recently completed a first-generation installation of the SMOKE emissions modeling system into the WRF-Chemistry model. WRF-Chem features chemical calculations online in an integrated code with the WRF meteorology model using the Eulerian mass-based vertical coordinate. This implementation involved a thorough revision of many of the SMOKE routines; these will be briefly reviewed in the talk.

Further, WRF-Chem/SMOKE has been applied for a test case against the identical WRF-Chem model using a more primitive emissions input file. We will explain the fundamental differences in these emissions inputs and describe how the model results compare. Plans for releasing the system to the WRF community will be described as well.