How does deposition of gas phase species affect pH at frozen salty interfaces?
Chemical processes occurring on snow and ice surfaces play an important role in controlling the oxidative capacity of the overlying atmosphere. However, efforts to gain a better, mechanistic understanding of such processes are impeded by our poor understanding of the chemical nature of the air-ice i...
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Online Access: | https://doi.org/10.5194/acp-12-10065-2012 https://www.atmos-chem-phys.net/12/10065/2012/ |
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ftcopernicus:oai:publications.copernicus.org:acp16346 2023-05-15T18:18:19+02:00 How does deposition of gas phase species affect pH at frozen salty interfaces? Wren, S. N. Donaldson, D. J. 2018-01-15 application/pdf https://doi.org/10.5194/acp-12-10065-2012 https://www.atmos-chem-phys.net/12/10065/2012/ eng eng doi:10.5194/acp-12-10065-2012 https://www.atmos-chem-phys.net/12/10065/2012/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-12-10065-2012 2019-12-24T09:55:46Z Chemical processes occurring on snow and ice surfaces play an important role in controlling the oxidative capacity of the overlying atmosphere. However, efforts to gain a better, mechanistic understanding of such processes are impeded by our poor understanding of the chemical nature of the air-ice interface. Here we use glancing-angle laser induced fluorescence in conjunction with harmine – a surface-active, pH-sensitive fluorescent dye – to investigate how the nature of the ice, whether frozen freshwater, salt water or seawater, influences pH changes at the surface. Deposition of HCl(g) leads to a very different pH response at the frozen freshwater surface than at the frozen salt water surface indicating that these two surfaces present different chemical environments. Importantly, the sea ice surface is buffered against pH changes arising from deposition of gas phase species. These results have important implications for understanding pH-sensitive processes occurring at the air-ice boundary, such as bromine activation. Text Sea ice Copernicus Publications: E-Journals Atmospheric Chemistry and Physics 12 21 10065 10073 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Chemical processes occurring on snow and ice surfaces play an important role in controlling the oxidative capacity of the overlying atmosphere. However, efforts to gain a better, mechanistic understanding of such processes are impeded by our poor understanding of the chemical nature of the air-ice interface. Here we use glancing-angle laser induced fluorescence in conjunction with harmine – a surface-active, pH-sensitive fluorescent dye – to investigate how the nature of the ice, whether frozen freshwater, salt water or seawater, influences pH changes at the surface. Deposition of HCl(g) leads to a very different pH response at the frozen freshwater surface than at the frozen salt water surface indicating that these two surfaces present different chemical environments. Importantly, the sea ice surface is buffered against pH changes arising from deposition of gas phase species. These results have important implications for understanding pH-sensitive processes occurring at the air-ice boundary, such as bromine activation. |
format |
Text |
author |
Wren, S. N. Donaldson, D. J. |
spellingShingle |
Wren, S. N. Donaldson, D. J. How does deposition of gas phase species affect pH at frozen salty interfaces? |
author_facet |
Wren, S. N. Donaldson, D. J. |
author_sort |
Wren, S. N. |
title |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
title_short |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
title_full |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
title_fullStr |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
title_full_unstemmed |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
title_sort |
how does deposition of gas phase species affect ph at frozen salty interfaces? |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-12-10065-2012 https://www.atmos-chem-phys.net/12/10065/2012/ |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-12-10065-2012 https://www.atmos-chem-phys.net/12/10065/2012/ |
op_doi |
https://doi.org/10.5194/acp-12-10065-2012 |
container_title |
Atmospheric Chemistry and Physics |
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12 |
container_issue |
21 |
container_start_page |
10065 |
op_container_end_page |
10073 |
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1766194864032055296 |