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| Titel |
How does deposition of gas phase species affect pH at frozen salty interfaces? |
| VerfasserIn |
S. N. Wren, D. J. Donaldson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 21 ; Nr. 12, no. 21 (2012-11-02), S.10065-10073 |
| Datensatznummer |
250011552
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| Publikation (Nr.) |
 copernicus.org/acp-12-10065-2012.pdf |
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| Zusammenfassung |
| 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. |
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