Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska
The springtime depletion of tropospheric ozone in the Arctic is known to be caused by active halogen photochemistry resulting from halogen atom precursors emitted from snow, ice, or aerosol surfaces. The role of bromine in driving ozone depletion events (ODEs) has been generally accepted, but much l...
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ftcopernicus:oai:publications.copernicus.org:acp26493 2023-05-15T14:58:04+02:00 Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska Thompson, C. R. Shepson, P. B. Liao, J. Huey, L. G. Apel, E. C. Cantrell, C. A. Flocke, F. Orlando, J. Fried, A. Hall, S. R. Hornbrook, R. S. Knapp, D. J. Mauldin III, R. L. Montzka, D. D. Sive, B. C. Ullmann, K. Weibring, P. Weinheimer, A. 2018-09-19 application/pdf https://doi.org/10.5194/acp-15-9651-2015 https://www.atmos-chem-phys.net/15/9651/2015/ eng eng doi:10.5194/acp-15-9651-2015 https://www.atmos-chem-phys.net/15/9651/2015/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-15-9651-2015 2019-12-24T09:53:08Z The springtime depletion of tropospheric ozone in the Arctic is known to be caused by active halogen photochemistry resulting from halogen atom precursors emitted from snow, ice, or aerosol surfaces. The role of bromine in driving ozone depletion events (ODEs) has been generally accepted, but much less is known about the role of chlorine radicals in ozone depletion chemistry. While the potential impact of iodine in the High Arctic is more uncertain, there have been indications of active iodine chemistry through observed enhancements in filterable iodide, probable detection of tropospheric IO, and recently, observation of snowpack photochemical production of I 2 . Despite decades of research, significant uncertainty remains regarding the chemical mechanisms associated with the bromine-catalyzed depletion of ozone, as well as the complex interactions that occur in the polar boundary layer due to halogen chemistry. To investigate this, we developed a zero-dimensional photochemical model, constrained with measurements from the 2009 OASIS field campaign in Barrow, Alaska. We simulated a 7-day period during late March that included a full ozone depletion event lasting 3 days and subsequent ozone recovery to study the interactions of halogen radicals under these different conditions. In addition, the effects of iodine added to our Base Model were investigated. While bromine atoms were primarily responsible for ODEs, chlorine and iodine were found to enhance the depletion rates and iodine was found to be more efficient per atom at depleting ozone than Br. The interaction between chlorine and bromine is complex, as the presence of chlorine can increase the recycling and production of Br atoms, while also increasing reactive bromine sinks under certain conditions. Chlorine chemistry was also found to have significant impacts on both HO 2 and RO 2 , with organic compounds serving as the primary reaction partner for Cl atoms. The results of this work highlight the need for future studies on the production mechanisms of Br 2 and Cl 2 , as well as on the potential impact of iodine in the High Arctic. Text Arctic Barrow Alaska Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 15 16 9651 9679 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The springtime depletion of tropospheric ozone in the Arctic is known to be caused by active halogen photochemistry resulting from halogen atom precursors emitted from snow, ice, or aerosol surfaces. The role of bromine in driving ozone depletion events (ODEs) has been generally accepted, but much less is known about the role of chlorine radicals in ozone depletion chemistry. While the potential impact of iodine in the High Arctic is more uncertain, there have been indications of active iodine chemistry through observed enhancements in filterable iodide, probable detection of tropospheric IO, and recently, observation of snowpack photochemical production of I 2 . Despite decades of research, significant uncertainty remains regarding the chemical mechanisms associated with the bromine-catalyzed depletion of ozone, as well as the complex interactions that occur in the polar boundary layer due to halogen chemistry. To investigate this, we developed a zero-dimensional photochemical model, constrained with measurements from the 2009 OASIS field campaign in Barrow, Alaska. We simulated a 7-day period during late March that included a full ozone depletion event lasting 3 days and subsequent ozone recovery to study the interactions of halogen radicals under these different conditions. In addition, the effects of iodine added to our Base Model were investigated. While bromine atoms were primarily responsible for ODEs, chlorine and iodine were found to enhance the depletion rates and iodine was found to be more efficient per atom at depleting ozone than Br. The interaction between chlorine and bromine is complex, as the presence of chlorine can increase the recycling and production of Br atoms, while also increasing reactive bromine sinks under certain conditions. Chlorine chemistry was also found to have significant impacts on both HO 2 and RO 2 , with organic compounds serving as the primary reaction partner for Cl atoms. The results of this work highlight the need for future studies on the production mechanisms of Br 2 and Cl 2 , as well as on the potential impact of iodine in the High Arctic. |
format |
Text |
author |
Thompson, C. R. Shepson, P. B. Liao, J. Huey, L. G. Apel, E. C. Cantrell, C. A. Flocke, F. Orlando, J. Fried, A. Hall, S. R. Hornbrook, R. S. Knapp, D. J. Mauldin III, R. L. Montzka, D. D. Sive, B. C. Ullmann, K. Weibring, P. Weinheimer, A. |
spellingShingle |
Thompson, C. R. Shepson, P. B. Liao, J. Huey, L. G. Apel, E. C. Cantrell, C. A. Flocke, F. Orlando, J. Fried, A. Hall, S. R. Hornbrook, R. S. Knapp, D. J. Mauldin III, R. L. Montzka, D. D. Sive, B. C. Ullmann, K. Weibring, P. Weinheimer, A. Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
author_facet |
Thompson, C. R. Shepson, P. B. Liao, J. Huey, L. G. Apel, E. C. Cantrell, C. A. Flocke, F. Orlando, J. Fried, A. Hall, S. R. Hornbrook, R. S. Knapp, D. J. Mauldin III, R. L. Montzka, D. D. Sive, B. C. Ullmann, K. Weibring, P. Weinheimer, A. |
author_sort |
Thompson, C. R. |
title |
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
title_short |
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
title_full |
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
title_fullStr |
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
title_full_unstemmed |
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska |
title_sort |
interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in barrow, alaska |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-15-9651-2015 https://www.atmos-chem-phys.net/15/9651/2015/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Alaska |
genre_facet |
Arctic Barrow Alaska |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-15-9651-2015 https://www.atmos-chem-phys.net/15/9651/2015/ |
op_doi |
https://doi.org/10.5194/acp-15-9651-2015 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
15 |
container_issue |
16 |
container_start_page |
9651 |
op_container_end_page |
9679 |
_version_ |
1766330162701402112 |