Ozone Modeling Using Neural Networks

Ozone models for the city of Tulsa were developed using neural network modeling techniques. The neural models were developed using meteorological data from the Oklahoma Mesonet and ozone, nitric oxide, and nitrogen dioxide (NO₂) data from Environmental Protection Agency monitoring sites in the Tulsa...

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Bibliographic Details
Published in:Journal of applied meteorology (1988) 2000-03, Vol.39 (3), p.291-296
Main Authors: Narasimhan, Ramesh, Keller, Joleen, Subramaniam, Ganesh, Raasch, Eric, Croley, Brandon, Duncan, Kathleen, Potter, William T.
Format: Article
Language:English
Subjects:
Atmospheric models
Datasets
Environmental agencies
Model trains
Ozone
Parametric models
Relative humidity
Solar radiation
Solar temperature
Wind velocity
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Summary:Ozone models for the city of Tulsa were developed using neural network modeling techniques. The neural models were developed using meteorological data from the Oklahoma Mesonet and ozone, nitric oxide, and nitrogen dioxide (NO₂) data from Environmental Protection Agency monitoring sites in the Tulsa area. An initial model trained with only eight surface meteorological input variables and NO₂ was able to simulate ozone concentrations with a correlation coefficient of 0.77. The trained model was then used to evaluate the sensitivity to the primary variables that affect ozone concentrations. The most important variables (NO₂, temperature, solar radiation, and relative humidity) showed response curves with strong nonlinear codependencies. Incorporation of ozone concentrations from the previous 3 days into the model increased the correlation coefficient to 0.82. As expected, the ozone concentrations correlated best with the most recent (1-day previous) values. The model’s correlation coefficient was increased to 0.88 by the incorporation of upper-air data from the National Weather Service’s Nested Grid Model. Sensitivity analysis for the upper-air variables indicated unusual positive correlations between ozone and the relative humidity from 500 hPa to the tropopause in addition to the other expected correlations with upper-air temperatures, vertical wind velocity, and 1000–500-hPa layer thickness. The neural model results are encouraging for the further use of these systems to evaluate complex parameter cosensitivities, and for the use of these systems in automated ozone forecast systems.
ISSN:0894-8763
1520-0450
DOI:10.1175/1520-0450(2000)039<0291:OMUNN>2.0.CO;2