Modeling Ozone in the Eastern United States Using a Fuel-Based Mobile Source Emissions Inventory

Monday, 14 December 2015: 09:15
3010 (Moscone West)
Brian C Mcdonald1,2, Ravan Ahmadov3, Stuart A McKeen4, Si-Wan Kim4, Gregory J Frost5 and Michael Trainer6, (1)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (2)Chemical Sciences Division, NOAA ESRL, Boulder, CO, United States, (3)University of Colorado at Boulder, Boulder, CO, United States, (4)CIRES, Boulder, CO, United States, (5)NOAA Boulder, Boulder, CO, United States, (6)NOAA ESRL Chemical Sciences Division, Boulder, CO, United States
A fuel-based mobile source emissions inventory of nitrogen oxides (NOx) and carbon monoxide (CO) is developed for the continental US. Emissions are mapped for the year 2013, including emissions from on-road gasoline and diesel vehicles, and off-road engines. We find that mobile source emissions of NOx in the National Emissions Inventory 2011 (NEI11) are 50-60% higher than results from this study; mobile sources contribute around half of total US anthropogenic NOx emissions. We model chemistry and transport of emissions from the NEI11 and our fuel-based inventory during the Southeast Nexus (SENEX) Study period in the summer of 2013, using the Weather Research and Forecasting with Chemistry (WRF-Chem) model. In the Eastern US, there is a consistent over-prediction of tropospheric ozone (O3) levels when simulating emissions from the NEI11, with the largest biases located in the Southeastern US. Using our fuel-based inventory, we test O3 sensitivity to lower NOx emissions. We highlight results in the Southeast, a region with significant interactions between anthropogenic and biogenic emissions of ozone precursors. Model results of NOy, CO, and O3 are compared with aircraft measurements made during SENEX.