HR: 15:10h
AN: A43G-06    [Abstracts]
TI: Regional Variations in Intercontinental Transport of Ozone to the United States
AU: * Holloway, T
EM: taholloway@wisc.edu
AF: SAGE, University of Wisconsin--Madison, 1710 University Avenue, Madison, WI 53726, United States
AU: Moberg, C C
EM: ccmoberg@wisc.edu
AF: SAGE, University of Wisconsin--Madison, 1710 University Avenue, Madison, WI 53726, United States
AU: Ehlers, S
EM: smehlers@wisc.edu
AF: SAGE, University of Wisconsin--Madison, 1710 University Avenue, Madison, WI 53726, United States
AB: This study quantifies the contribution of emissions from Asia and Europe on surface ozone concentrations in nine regions of the U.S. using the MOZART global chemical transport model. In each region, we assess the magnitude of Asian and European influence on surface concentrations, and identify key processes controlling the transport of imported species from the free troposphere to the surface. We find that imported ozone exhibits a bimodal seasonal distribution in west coast regions (Pacific Northwest, Northern California, and Southern California), consistent with other analyses of seasonal patterns in long-range transport to Europe and Asia. However, this seasonal pattern is absent in eastern regions (New England, Mid-Atlantic, and Southeast). The relative contributions of Asian and European emissions vary by region, as does the magnitude of imported ozone, and the conditions under which maximum import occurs. These differences reflect regionally specific import processes and local emissions.
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting