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| Titel |
Modelling multi-phase halogen chemistry in the coastal marine boundary layer: investigation of the relative importance of local chemistry vs. long-range transport |
| VerfasserIn |
D. Lowe, J. Ryder, R. Leigh, J. R. Dorsey, G. McFiggans |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-02), S.979-994 |
| Datensatznummer |
250009286
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| Publikation (Nr.) |
 copernicus.org/acp-11-979-2011.pdf |
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| Zusammenfassung |
| Measurements of significant concentrations of IO, I2
and BrO in a semi-polluted coast environment at Roscoff, in
North-West France, have been made as part of the Reactive Halogens in
the Marine Boundary Layer (RHaMBLe) campaign undertaken in September
2006. We use a one-dimensional column model, with idealised I2
emissions predicted using macroalgael maps and tidal data from the
littoral area surrounding Roscoff, to investigate the probable causes
for these observations. The coupled microphysical and chemical aerosol
model simulates mixed-phase halogen chemistry using two separate
particle modes, seasalt and non-seasalt, each comprising of eight
size-sections. This work confirms the finding of a previous study that
the BrO measurements are most likely caused by unknown, local
sources. We find that the remote observations of IO and
I2 are best replicated using the I2 recycling
mechanism suggested by previous studies, but that such a mechanism is
not wholly necessary. However in-situ measurements of I2
can only be explained by invoking an I2 recycling mechanism.
We suggest that focussed observations of
the changes in NOx and NOy concentrations, as well as
changes in the nitrate fraction of the non-seasalt aerosol mode, in
the presence of I2 bursts could be used to determine the
atmospheric relevance of the predicted I2 recycling mechanism. |
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