HR: 09:15h
AN: A41D-06    [Abstracts]
TI: Late-spring Increase of Trans-Pacific Pollution Transport in the Upper Troposphere
AU: * Wang, Y
EM: ywang@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, 30332
AU: Choi, Y
EM: ychoi@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, 30332
AU: Zeng, T
EM: tzeng@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, 30332
AB: The observations during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiment show large enhancements of NOx, PAN, O3, CO, CFCs, and Halon-1211 in the upper troposphere over North America in late spring. Analysis of these observations and model results indicate that the enhancements are driven by a surge of trans-Pacific pollutant transport in late spring. The rapid seasonal transition is particularly striking for upper tropospheric NOx, resulting in large increases in photochemical oxidation and O3 production during the period. The transition is later in season than that of low-altitude trans-Pacific transport, which peak in March and April. The current generation of global chemical transport models clearly underestimates this long-range transport of pollutants, implying that the model-projected impact on regional air quality due to intercontinental pollution transport is also underestimated.
UR: http://apollo.eas.gatech.edu
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005