The Martilli-Dupont urbanization scheme in MM5 was used to simulate synoptic, coastal, and urban influences on PBL flows during a Texas2000 ozone episode. Daytime urban heat island reductions from a US Forest Service-generated tree-planting program were also simulated to evaluate potential EPA emission-reduction ozone credits for Houston. The urbanization scheme increased maximum daytime urban heat islands from 2 K to 3.5 K (also the observed value), while urban reforestation decreased this latter value by 0.9 K; urban deforestation in expanding suburban regions increased maximum temperatures in those areas. Results showed interactions between a variety of coastal processes (morning bay breezes, afternoon gulf breezes) and urban processes (urban heat islands, decelerations, convergences) that affected ozone transport processes.

Research efforts for 2007 will also be discussed, including a new NCAR/San Jose State University project to urbanize WRF and use it to model ozone-impacts from observed long-term, summer, daytime cooling in California coastal air-basins.