Seasonal Transpacific Transport of Asian Ozone and PAN Using Aura TES PAN Retrievals

Monday, 15 December 2014: 4:30 PM
Zhe Jiang1, John Worden1, Vivienne Payne1, Emily V Fischer2, Thomas W Walker3, Dylan B. A. Jones3 and Daven K Henze4, (1)Jet Propulsion Laboratory, Pasadena, CA, United States, (2)Colorado State University, Fort Collins, CO, United States, (3)University of Toronto, Toronto, ON, Canada, (4)University of Colorado at Boulder, Boulder, CO, United States
Long range transport of Asian ozone pollution depends on the conversion of surface NOx emissions into Peroxyacyl Nitrate (PAN) and subsequent transpacific transport of PAN in the free-troposphere where it is stable because of cold temperatures. Once PAN subsides into the warmer lower troposphere it is converted back into NOx, which can in turn form ozone. In this presentation we use new PAN retrievals from the Aura TES instrument to characterize the seasonal cycle of free-tropospheric PAN from Asian emissions and its subsequent transport to North America. The GEOS-Chem chemical transport model and its adjoint are used to quantify the intercontinental source attribution of ozone pollution at western United States.