HR: 09:45h
AN: A41C-07    [Abstracts]
TI: The Sensitivity of Ozone and Hydroxyl Radical Concentrations to Measured and Modeled Actinic Flux and Three Chemical Mechanisms
AU: * Goliff, W S
EM: wendy.goliff@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AU: Stockwell, W R
EM: William.Stockwell@dri.edu
AF: Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 United States
AB: The field measurement program of the Central California Ozone Study (CCOS) was conducted during the summer of 2000 with an overall goal of improving the understanding of ozone formation over central and northern California. Measurements of actinic flux were made as part of the study using spectroradiometers located at University of California at Davis, Sunol, California and the Desert Research Institute at Reno, Nevada. The measured actinic flux was used, along with standard quantum yields and absorption cross-section data to calculate the photolysis rate parameters for nitrogen dioxide, ozone and formaldehyde, and a radiative transfer model was used to simulate these same photolysis rate parameters. An atmospheric chemistry box-model, OZIPR using the RADM2 mechanism, was used to estimate the significance of differences between rates based on models versus measurements for air quality assessment. The code for the OZIPR model was also modified to accommodate the Regional Atmospheric Chemistry Mechanism, (RACM), and the new Regional Atmospheric Chemistry Mechanism, Version 2 (RACM2). The modified model was used to compare the sensitivity of each mechanism to the photolytic rate parameters with respect to ozone formation and hydroxyl radical (HO) formation.
DE: 9350 North America
DE: 9800 GENERAL OR MISCELLANEOUS
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting