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Francis S. Binkowski, Saravanan Arunachalam, Zachariah Adelman, and Joseph P. Pinto

includes the time-dependent opacity of O 3 and nitrogen dioxide (NO 2 ) as well as aerosol particle extinction as they develop during a given CMAQ calculation. The new module is called for every grid cell at every synchronization time step, thereby eliminating the need for temporal and spatial interpolation. The new module calculates the solar radiative transfer in the same seven wavelength intervals used in “Fast-J,” a photolysis module currently used in several global climate models ( Wild et al

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George Kallos, Marina Astitha, Petros Katsafados, and Chris Spyrou

evolution (e.g., impact of sea salt, sulfates, or mineral dust). The combination or coexistence of these PM in the wet environment is not understood well ( Andreae et al. 2004 ; Levin et al. 2005 ; Rosenfeld 2006 ; among others). Radiative-transfer impacts and interactions appear to be poorly described, especially for naturally produced aerosols. The influence of marine types of aerosols (e.g., DMS or sea salt) on air quality has not been clarified yet. Climate and air-quality feedbacks are not well

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