Title: Implications of iodine chemistry for daytime HO<sub>2</sub> levels at Rishiri Island
Abstract: The observed midday maximum in the mixing ratio of HO 2 at Rishiri Island in June 2000 was ∼10 pptv, but photochemical box model simulations overpredicted HO 2 at this location by an average of 70%. This overestimation was significant only when the mixing ratio of NO was lower than 300 pptv, and was coincident with overprediction of the NO/NO 2 ratio. We detected several organoiodines, presumably emitted from seaweeds, and propose the presence of the IO radical. IO could reduce HO 2 mixing ratios via the formation of HOI that may subsequently be scavenged by aerosols or lost by photolysis and may also convert NO to NO 2 directly. Model calculations with known iodine chemistry could reproduce the observed HO 2 with 12–25 pptv of IO. Although iodine chemistry is unlikely to explain the entire discrepancy in HO 2 , several pptv of IO could significantly reduce HO 2 mixing ratios and NO/NO 2 ratios.
Publication Year: 2002
Publication Date: 2002-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 53
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