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

Zhe Jiang1, John Worden1, Vivienne Payne2, Emily V Fischer3, Thomas W Walker4, Dylan B. A. Jones4 and Daven K Henze5, (1)Jet Propulsion Laboratory, Pasadena, CA, United States, (2)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, (3)Colorado State University, Department of Atmospheric Science, Fort Collins, CO, United States, (4)University of Toronto, Toronto, ON, Canada, (5)University of Colorado Boulder, Mechanical Engineering, Boulder, United States
Abstract:
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.
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