Dynamical and microphysical analysis of transnational pollutant transport over the eastern United States from Canadian forest fires

Details Dynamical and microphysical analysis of transnational pollutant transport over the eastern United States from Canadian forest fires Dynamical and microphysical analysis of transnational pollutant transport over the eastern United States from Canadian forest fires

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4191c&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4191

Physics

Scientific paper

There is increasing interest in and evidence for transnational transport of pollutants which adversely affect air quality downwind of source regions. As an example of this kind event we investigate the transport and aerosol microphysics associated with the smoke plume generated by forest fires burning in Quebec, Canada, during early July 2002. The plume was transported rapidly to the east coast of the United States by a low pressure system over Nova Scotia, Canada. Imagery from SeaWIFS and TOMS space-based sensors show the smoke plume was widespread and optically thick. Back trajectories show the plume was transported at about 3 km altitude. The altitude of the plume transport was confirmed by aircraft profile measurements made in the Washington, D.C., area. Micropulse lidar observations near Washington, D.C., show aerosol associated with the plume descending from altitude to the surface over a period of one day. We speculate that the aerosol is mixed into the planetary boundary layer at altitude and drawn to the surface when the turbulent boundary layer becomes deep enough to intercept the plume. Simulations with an aerosol microphysics and transport model confirm the mechanisms for aerosol mixing to the surface and show the evolution of the smoke particle size and its impact of the aerosol optical properties.

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