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| Titel |
Modelling chemistry over the Dead Sea: bromine and ozone chemistry |
| VerfasserIn |
L. Smoydzin, R. Glasow |
| 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 ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-28), S.5057-5072 |
| Datensatznummer |
250007532
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| Publikation (Nr.) |
 copernicus.org/acp-9-5057-2009.pdf |
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| Zusammenfassung |
| Measurements of O3 and BrO concentrations over the Dead Sea
indicate that Ozone Depletion Events (ODEs), widely known to happen in
polar regions, are also occuring over the Dead Sea due to the
very high bromine content of the Dead Sea water. However, we show that
BrO and O3 levels as they are detected cannot solely be
explained by high Br− levels in the Dead Sea water and the
release of gas phase halogen species out of sea borne aerosol
particles and their conversion to reactive halogen species. It is
likely that other sources for reactive halogen compounds are needed to
explain the observed concentrations for BrO and O3. To explain
the chemical mechanism taking place over the Dead Sea leading to BrO
levels of several pmol/mol we used the one-dimensional model MISTRA which
calculates microphysics, meteorology, gas and aerosol phase
chemistry. We performed pseudo Lagrangian studies by letting the model
column first move over the desert which surrounds the Dead Sea region
and then let it move over the Dead Sea itself. To include an
additional source for gas phase halogen compounds, gas exchange between
the Dead Sea water and the atmosphere is treated explicitly. Model
calculations indicate that this process has to be included to explain
the measurements. |
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