Integrated Reaction Rate Analysis of Ozone Production in a Photochemical Oxidant Model
Public Deposited- Last Modified
- February 28, 2019
- Creator
-
Crouse, Raymond R.
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- Photochemical oxidant models are used to determine the level of control of anthropogenic hydrocarbon and nitrogen oxide emissions needed to meet the national ambient air quality standard for ozone. Current models have sophisticated representations of the physical processes controlling the sources, sinks, transport and transformations of tropospheric trace gasses. The output from these models is often simply the time dependent concentration of the trace gasses. This makes it difficult to understand exactly why the model predicts what it does. It is desirable to perform a mass balance analysis of the model output to determine the relative importance of the physical processes and chemistry which control the gas concentrations simulated by the model. A mass balance analysis would provide: • a tool for understanding how a model or how a specific chemical mechanism works; • insights into the source of urban oxidant problems and the appropriateness of various control strategies; • the ability to treat urban areas as large chemical reactors which process anthropogenic trace gas emissions before they are released to the free troposphere. In Chapter 2, I describe modifications to a photochemical oxidant model OZIPR, a research version of EPA's Ozone Isopleth Plotting Program (OZIPP). OZIPR produces output that includes time integrated reaction rates for each reaction, and time integrated dilution, deposition and emissions for each trace gas. I then describe a FORTRAN program, IRREVAL, which can be used to analyze the integrated reaction rates and provide a series of tables showing mass balance information for ozone, nitrogen oxides, OH radicals, and other species of importance. In Chapter 7, I use OZIPR and the Empirical Kinetic Modeling Approach to evaluate the sensitivity of VOC control requirement predictions to CO concentrations. Doubling the initial and aloft CO concentrations increased the VOC control requirement from 23 to 43%. I used these model simulations as an example to illustrate the use of the IRREVAL analysis program.
- Date of publication
- November 1989
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Kamens, R. M.
- Jeffries, Harvey E.
- Pinto, Joe
- Degree
- Master of Science in Environmental Engineering
- Academic concentration
- Industrial Hygiene
- Degree granting institution
- University of North Carolina at Chapel Hill
- Graduation year
- 1989
- Language
- Deposit record
- ad7e9272-7c4f-43e0-afeb-7a5f2526ad76
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