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Impacts of black carbon aerosol on photolysis and ozone.pdf

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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, D23206, doi:10.1029/2005JD005898, 2005 Impacts of black carbon aerosol on photolysis and ozone Guohui Li, Renyi Zhang, and Jiwen Fan Department of Atmospheric Sciences, Texas AM University, College Station, Texas, USA Xuexi Tie Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA Received 18 February 2005; revised 19 May 2005; accepted 16 August 2005; published 6 December 2005. [1] The regional distributions of black carbon aerosol (soot) are calculated and the impacts of black carbon aerosol on photolysis frequencies and ozone concentrations are evaluated in Houston, Texas, using a regional chemical transport model. Compared with measurements of the fine particle matter in the Houston area, the simulated daily mean black carbon aerosol concentration is in agreement with observations in the urban 1 sites. Black carbon aerosol reduces the photolysis frequencies of J [O ( D)] and J [NO ] in 3 2 the planetary boundary layer by 10–30% when air pollution is highest in the Houston area. As a result, the ground level ozone concentration in the Houston area decreases by 5–20%. Our study demonstrates that the impacts of black carbon aerosol on photochemistry are important in polluted urban atmospheres. Citation: Li, G., R. Zhang, J. Fan, and X. Tie (2005), Impacts of black carbon aerosol on photolysis and ozone, J. Geophys. Res. , 110, D23206, doi:10.1029/2005JD005898. 1. Introduction to ultraviolet (UV) radiation, the effect on photolysis frequencies in the troposphere needs to be taken into [2]