High levels of the hydroxyl radical in the winter urban troposphere

Details High levels of the hydroxyl radical in the winter urban troposphere High levels of the hydroxyl radical in the winter urban troposphere

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3118112h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 18, CiteID L18112

Physics

14

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry

Scientific paper

Measurements of the OH radical during winter show that noon-time concentrations at an urban site in Birmingham are only a factor of 2 less than during summer at the same site, despite a factor of 15 reduction in OH production from the photolysis of ozone. Noon-time concentrations of HO2 were similar for summer and winter. These high winter concentrations are quantitatively reproduced by a detailed box-model, showing that the winter radical pool (OH, HO2, RO2) is sustained by reactions of unsaturated hydrocarbons with ozone and by the photolysis of carbonyls. The high OH concentrations show there is significant chemical processing of volatile organic compounds (VOCs) in winter at mid-to-high latitudes in the northern hemisphere where emissions are high.

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