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Title: Modelling multi-phase halogen chemistry in the coastal marine boundary layer: Investigation of the relative importance of local chemistry vs. long-range transport
Authors: Lowe, D.
Ryder, J.
Leigh, R.
Dorsey, J.R.
McFiggans, G.
First Published: 2011
Publisher: Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU).
Citation: Atmospheric Chemistry and Physics, 2011, 11 (3), pp. 979-994
Abstract: Measurements of significant concentrations of IO, I[subscript 2] 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 I[subscript 2] 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 I[subscript 2] are best replicated using the I[subscript 2] recycling mechanism suggested by previous studies, but that such a mechanism is not wholly necessary. However in-situ measurements of I[subscript 2] can only be explained by invoking an I[subscript 2] recycling mechanism. We suggest that focussed observations of the changes in NO[subscript x] and NO[subscript y] concentrations, as well as changes in the nitrate fraction of the non-seasalt aerosol mode, in the presence of I[subscript 2] bursts could be used to determine the atmospheric relevance of the predicted I[subscript 2] recycling mechanism.
DOI Link: 10.5194/acp-11-979-2011
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © Author(s) 2011. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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