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REFINED PHOTOLYSIS RATES FOR ADVANCED AIR QUALITY MODELING SYSTEM
Citation:
Roselle, S., A. Hanna, Y. Lu, J. Jang, K. Schere, AND J. Pleim. REFINED PHOTOLYSIS RATES FOR ADVANCED AIR QUALITY MODELING SYSTEM. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/126 (NTIS PB96116843), 1996.
Description:
Accurate modeling of photochemistry is critical and fundamental to reducing the uncertainty in air quality model predictions. lmost all chemical reactions in the atmosphere are initiated by the photodissociation of a number of trace gases. irect measure of this photodissociation is the photolysis rate. any current air quality models use crude approximations to calculate the photolysis rates with little consideration of variations in vertical profiles of temperature, ozone concentrations, aerosol concentrations, cloud parameters, and spectral surface albedo. owever, more accurate estimates of photolysis rates can be produced with advanced radiative transfer modeling techniques and data measurements. efined module is being developed to simulate the actinic flux and photolysis rates of tropospheric species for air quality and tropospheric photochemistry modeling. he module will combine advanced radiative transfer models with explicit computations of photolysis rates using detailed information on (1) prevailing atmospheric conditions during simulation episodes, (2) satellite ozone and cloud coverage data, and (3) detailed characteristics of clouds, aerosols and surface albedo.
