Observational evidence of ozone depletion by nitric oxide at 40 km downwind of a medium size city |
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| Institution: | 1. King''s College London, Social, Genetic & Developmental Psychiatry Centre, Institute of Psychiatry, Psychology & Neuroscience, 16 De Crespigny Park, SE5 8AF, London, UK;2. King''s College London, Environmental Research Group, MRC-PHE Centre for Environment and Health, London, UK;3. King''s College London, Department of Child & Adolescent Psychiatry, Institute of Psychiatry, Psychology & Neuroscience, London, UK;4. National & Specialist CAMHS Clinic for Trauma, Anxiety and Depression, South London & Maudsley NHS Foundation Trust, London, UK;5. Sanford School of Public Policy, Duke University, Durham, NC, USA;6. Department of Psychology and Social Behavior, University of California Irvine, Irvine, CA, USA;7. Departments of Psychology and Neuroscience, Psychiatry and Behavioral Sciences, and Centre for Genomic and Computational Biology, Duke University, Durham, NC, USA |
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| Abstract: | Measurements of ozone, oxides of nitrogen, wind and net radiation were made at two sites located about 40 km downwind of the city of calgary which has a population about 625,000. Calgary is located in southern Alberta, Canada, at latitude 51°06′N.Differences in ozone concentrations between the two sites usually showed evidence of depletion through nitric oxide scavenging. Mean levels of depletion were, as required by scavenging theory, highly correlated with similar levels of nitrogen dioxide creation. Departures from correlation are largely explainable in terms of mesoscale variations in ozone.Only about 3 per cent of the data showed ozone depletion to be less than that which would have been expected on the basis of nitric oxide scavenging. These data were collected during afternoon periods and might indicate the presence of ozone creation attributable to photochemical reactions. The lack of more evidence for this phenomena appears to be due to the dispersive action of unsable atmospheres which would have rapidly reduced concentrations of NOx below values needed for measurable ozone creation. |
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