A modeling study of iodine chemistry in the marine boundary layer
TLDR
In this paper, an observationally constrained photochemical box model was developed to investigate the atmospheric chemistry of iodine in the marine boundary layer, motivated by recent measurements of the iodine monoxide (IO) radical (Allan et al., this issue).Abstract:
An observationally constrained photochemical box model has been developed to investigate the atmospheric chemistry of iodine in the marine boundary layer, motivated by recent measurements of the iodine monoxide (IO) radical (Allan et al., this issue). Good agreement with the time series of IO measured at a midlatitude coastal station was achieved by using a reaction scheme that included recycling of iodine through marine aerosol. The strong diurnal variation in IO observed in the subtropical Atlantic was satisfactorily modeled by assuming a constant concentration of iodocarbons that photolyzed to produce roughly 1×104 iodine atoms cm−3 s−1 at midday. The significance of the occurrence of IO at concentrations of up to 4 parts per trillion in the marine boundary layer was then considered from three angles. First, the iodine-catalyzed destruction of ozone was shown to be of a magnitude similar to that caused by odd-hydrogen photochemistry, with up to 13% of the available ozone destroyed per day in a marine air mass. Second, the enrichment factor of iodine in marine aerosol compared with surface seawater was predicted to increase to values of several thousand, in sensible accord with observations. Most of the enrichment should be due to the accumulation of iodate, although other iodine species may also be present, depending on the rate of aerosol recycling. Third, the denoxification of the marine boundary layer was found to be significantly enhanced as a result of aerosol uptake of IONO2, formed from the recombination of IO with NO2.read more
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Journal ArticleDOI
Marine aerosol formation from biogenic iodine emissions
Colin D. O'Dowd,Colin D. O'Dowd,Jose L. Jimenez,Richard C. Bahreini,Richard C. Flagan,John H. Seinfeld,Kaarle Hämeri,Liisa Pirjola,Markku Kulmala,S. Gerard Jennings,Thorsten Hoffmann +10 more
TL;DR: It is suggested that marine iodocarbon emissions have a potentially significant effect on global radiative forcing.
Journal ArticleDOI
Halogens and their role in polar boundary-layer ozone depletion
William R. Simpson,R. von Glasow,K. Riedel,Philip S. Anderson,Parisa A. Ariya,Jan W. Bottenheim,John P. Burrows,Lucy J. Carpenter,Udo Frieß,Michael Evan Goodsite,Dwayne E. Heard,Manuel A. Hutterli,Hans-Werner Jacobi,Lars Kaleschke,Basil Neff,John M. C. Plane,Ulrich Platt,Andreas Richter,Howard K. Roscoe,Rolf Sander,Paul B. Shepson,John R. Sodeau,Alexandra Steffen,Tanja Wagner,Tanja Wagner,Eric W. Wolff +25 more
TL;DR: In the polar regions, unique photochemistry converts inert halide salt ions (e.g. Br−) into reactive halogen species that deplete ozone in the boundary layer to near zero levels as discussed by the authors.
Journal ArticleDOI
Marine aerosol production: a review of the current knowledge
Colin D. O'Dowd,Gerrit de Leeuw +1 more
TL;DR: While a multistep process seems to be required, isoprene oxidation products are more likely to participate in growth and sulphuric acid is more likelyTo participate in nucleation, Iodine oxides are likely to participation in both nucleation and growth.
Journal ArticleDOI
Gas-phase radical chemistry in the troposphere
TL;DR: In this tutorial review, the chemistry of three main groups of atmospheric radicals HO(x), NO(x) and XO(x)(X = Cl, Br, I) are examined in terms of their sources, interconversions and sinks.
Journal ArticleDOI
Atmospheric Chemistry of Iodine
Alfonso Saiz-Lopez,John M. C. Plane,Alex R. Baker,Lucy J. Carpenter,Roland von Glasow,Juan Carlos Gómez Martín,Gordon McFiggans,R. W. Saunders +7 more
TL;DR: Atmospheric Chemistry of Iodine Alfonso Saiz-Lopez,* John M. C. Plane,* Alex R. Baker, Lucy J. Carpenter, Roland von Glasow, Juan C. G omez Martín, Gordon McFiggans, and Russell W. Smith.
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