||National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div. ;MCNC, Research Triangle Park, NC. North Carolina Supercomputing Center.;Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab.
An advanced computational model has been developed to simulate the actinic flux and photolysis rates of tropospheric species for air quality and tropospheric photochemical modeling. The model combines advanced radiative transfer models with explicit computations and photolysis rates using detailed information on prevailing atmospheric conditions during simulation episodes, satellite ozone data, and detailed characteristics of clouds, aerosols, and surface albedo. In this paper, the authors discuss the advantages of using the refined model to simulate photolysis rates over a standard lookup table method. The authors also discuss the sensitivity of the photolysis rate simulations to the radiative transfer scheme used as well as key parameters such as cloud, ozone profiles, and surface albedo.