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A modeling study of iodine chemistry in the marine boundary layer
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| Zeitschriftentitel: | Journal of Geophysical Research: Atmospheres |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Journal of Geophysical Research: Atmospheres, 105, 2000, D11, S. 14371-14385 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin |
|---|---|
| author |
McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin |
| spellingShingle |
McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin Journal of Geophysical Research: Atmospheres A modeling study of iodine chemistry in the marine boundary layer Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
mcfiggans, gordon |
| spelling |
McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/1999jd901187 <jats:p>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 1×10<jats:sup>4</jats:sup> iodine atoms cm<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup> 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 IONO<jats:sub>2</jats:sub>, formed from the recombination of IO with NO<jats:sub>2</jats:sub>.</jats:p> A modeling study of iodine chemistry in the marine boundary layer Journal of Geophysical Research: Atmospheres |
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| title |
A modeling study of iodine chemistry in the marine boundary layer |
| title_unstemmed |
A modeling study of iodine chemistry in the marine boundary layer |
| title_full |
A modeling study of iodine chemistry in the marine boundary layer |
| title_fullStr |
A modeling study of iodine chemistry in the marine boundary layer |
| title_full_unstemmed |
A modeling study of iodine chemistry in the marine boundary layer |
| title_short |
A modeling study of iodine chemistry in the marine boundary layer |
| title_sort |
a modeling study of iodine chemistry in the marine boundary layer |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
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http://dx.doi.org/10.1029/1999jd901187 |
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2000 |
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14371-14385 |
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<jats:p>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 1×10<jats:sup>4</jats:sup> iodine atoms cm<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup> 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 IONO<jats:sub>2</jats:sub>, formed from the recombination of IO with NO<jats:sub>2</jats:sub>.</jats:p> |
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| author | McFiggans, Gordon, Plane, John M. C., Allan, Beverley J., Carpenter, Lucy J., Coe, Hugh, O'Dowd, Colin |
| author_facet | McFiggans, Gordon, Plane, John M. C., Allan, Beverley J., Carpenter, Lucy J., Coe, Hugh, O'Dowd, Colin, McFiggans, Gordon, Plane, John M. C., Allan, Beverley J., Carpenter, Lucy J., Coe, Hugh, O'Dowd, Colin |
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| description | <jats:p>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 1×10<jats:sup>4</jats:sup> iodine atoms cm<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup> 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 IONO<jats:sub>2</jats:sub>, formed from the recombination of IO with NO<jats:sub>2</jats:sub>.</jats:p> |
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| spelling | McFiggans, Gordon Plane, John M. C. Allan, Beverley J. Carpenter, Lucy J. Coe, Hugh O'Dowd, Colin 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/1999jd901187 <jats:p>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 1×10<jats:sup>4</jats:sup> iodine atoms cm<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup> 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 IONO<jats:sub>2</jats:sub>, formed from the recombination of IO with NO<jats:sub>2</jats:sub>.</jats:p> A modeling study of iodine chemistry in the marine boundary layer Journal of Geophysical Research: Atmospheres |
| spellingShingle | McFiggans, Gordon, Plane, John M. C., Allan, Beverley J., Carpenter, Lucy J., Coe, Hugh, O'Dowd, Colin, Journal of Geophysical Research: Atmospheres, A modeling study of iodine chemistry in the marine boundary layer, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | A modeling study of iodine chemistry in the marine boundary layer |
| title_full | A modeling study of iodine chemistry in the marine boundary layer |
| title_fullStr | A modeling study of iodine chemistry in the marine boundary layer |
| title_full_unstemmed | A modeling study of iodine chemistry in the marine boundary layer |
| title_short | A modeling study of iodine chemistry in the marine boundary layer |
| title_sort | a modeling study of iodine chemistry in the marine boundary layer |
| title_unstemmed | A modeling study of iodine chemistry in the marine boundary layer |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/1999jd901187 |