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Yienger et al. 2000
Yienger, J.J., Galanter, M., Holloway, T.A., Phadnis, M.J., Guttikunda, S.K., Carmichael, G.R., Moxim, W.J. and Levy, H. (2000). The episodic nature of air pollution transport from Asia to North America. Journal of Geophysical Research 105: doi: 10.1029/2000JD900309. issn: 0148-0227.

We employ the Geophysical Fluid Dynamics Laboratory (GFDL) global chemistry transport model (GCTM) to address the episodic nature of trans-Pacific pollution. The strongest Asian CO episodes over North America (NA), occurring most frequently between February and May, are often associated with disturbances that entrain pollution over eastern Asia and amplify over the western Pacific Ocean. Using 55 ppb of Asian CO as a criterion for major events, we find that during a typical year three to five Asian pollution events analogous to those observed by Jaffe et al. <1999> are expected in the boundary layer all along the U.S. West Coast between February and May. In contrast to CO, Asia currently has a small impact on the magnitude and variability of background ozone arriving over NA from the west. Direct and indirect Asian contributions to episodic O3 events over the western United States are generally in the 3--10 ppbv range. The two largest total O3 events (>60 ppbv), while having trajectories which pass over Asia, show negligible impact from Asian emissions. However, this may change. A future emission scenario in which Asian NO4 emissions increase by a factor of 4 from those in 1990 produces late spring ozone episodes at the surface of California with Asian contributions reaching 40 ppb. Such episodic contributions are certain to exacerbate local NA pollution events, especially in elevated areas more frequently exposed to free tropospheric and more heavily Asian-influenced air. ¿ 2000 American Geophysical Union

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Abstract

Keywords
Atmospheric Composition and Structure, Constituent sources and sinks, Atmospheric Composition and Structure, Pollution—urban and regional, Atmospheric Composition and Structure, Troposphere—composition and chemistry, Atmospheric Composition and Structure, Troposphere—constituent transport and chemistry, Atmospheric Composition and Structure, Cloud physics and chemistry
Journal
Journal of Geophysical Research
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Publisher
American Geophysical Union
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