Trajectory Grid Transport Algorithm in CMAQ (Community Multiscale Air Quality Model)

摘要

Under CRC Project A-55, the Trajectory Grid (TG) advection algorithm was implemented within the Community Multiscale Air Quality Model (CMAQ) by researchers at the University of Houston. TG advection uses a Lagrangian approach and follows individual 'packets' of concentrations as each traverses in the grid system following a three-dimensional wind trajectory. The objectives of this project are to (1) provide an independent evaluation of the prototype of CMAQ-TG-UH; (2) describe how TG may be used to reduce advective transport errors; and (3) if applicable, make improvements to the implementation in CMAQ to reduce artificial diffusion and provide a better understanding of the turbulent diffusion process.