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Ozone production chemistry in the presence of urban plumes
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2016
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Source: Faraday Discussions, 189, 169-189
[PDF-740.67 KB]
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Journal Title:Faraday Discussions
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Personal Author:
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NOAA Program & Office:
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Description:Ozone pollution affects human health, especially in urban areas on hot sunny days. Its basic photochemistry has been known for decades and yet it is still not possible to correctly predict the high ozone levels that are the greatest threat. The CalNex_SJV study in Bakersfield CA in May/June 2010 provided an opportunity to examine ozone photochemistry in an urban area surrounded by agriculture. The measurement suite included hydroxyl (OH), hydroperoxyl (HO2), and OH reactivity, which are compared with the output of a photochemical box model. While the agreement is generally within combined uncertainties, measured HO2far exceeds modeled HO2in NOx-rich plumes. OH production and loss do not balance as they should in the morning, and the ozone production calculated with measured HO2is a decade greater than that calculated with modeled HO2when NO levels are high. Calculated ozone production using measured HO2is twice that using modeled HO2, but this difference in calculated ozone production has minimal impact on the assessment of NOx-sensitivity or VOC-sensitivity for midday ozone production. Evidence from this study indicates that this important discrepancy is not due to the HO2measurement or to the sampling of transported plumes but instead to either emissions of unknown organic species that accompany the NO emissions or unknown photochemistry involving nitrogen oxides and hydrogen oxides, possibly the hypothesized reaction OH + NO + O2→ HO2+ NO2.
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Source:Faraday Discussions, 189, 169-189
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DOI:
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ISSN:1359-6640;1364-5498;
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Document Type:
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Rights Information:Accepted Manuscript
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Compliance:Submitted
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