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Free tropospheric ozone production after deep convection of dispersing tropical urban plumes |
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| Authors: | Scott Elliott Chih-Yue Jim Kao Frank Gifford Sumner Barr Mei Shen RP Turco Mark Jacobson |
| Institution: | Earth and Environmental Science Division, Geoanalysis Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.;Atmospheric Sciences Department, University of California, Los Angeles, CA 90024, U.S.A.;Environmental Fluid Mechanics and Hydrology, Civil Engineering Department, Stanford University, Stanford, CA 94305, U.S.A. |
| Abstract: | Ozone generation is computed in a one-dimensional photochemistry code following convective redistribution of tropical urban effluent into the free troposphere. Simulations are run at several stages of pollutant dilution by surrounding surface air. A threshold boundary layer NOx concentration of 300 pptv is established for significant production enhancements at upper levels. Areas defined by the 300 pptv level are examined in the Gaussian dispersion framework based on a wet season plume event observed in Amazonia. Pollution travels slowly in the sluggish winds of the equatorial trough. Daily storms are likely to interrupt the effluent while coverages are still on the order of few thousand square kilometers and NOx concentrations are above the threshold. Dry season plume sizes are difficult to assess because local concentration data are scarce, but it is conceivable that the faster trade winds lead to a several fold extension. |
| Keywords: | Ozone convection urban plumes air pollution free troposphere |
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