Modelling multi-phase halogen chemistry in the coastal marine boundary layer: investigation of the relative importance of local chemistry vs. long-range transport

Lowe, D.; Ryder, J.; Leigh, R.; Dorsey, J.R.; McFiggans, G.. 2011 Modelling multi-phase halogen chemistry in the coastal marine boundary layer: investigation of the relative importance of local chemistry vs. long-range transport. Atmospheric Chemistry and Physics, 11 (3). 979-994. 10.5194/acp-11-979-2011

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.5194/acp-11-979-2011
Programmes:	CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes > BGC - 2.1 - Quantify & model processes that control the emission, fate and bioavailability of pollutants
UKCEH and CEH Sections/Science Areas:	Billett (to November 2013)
ISSN:	1680-7316
Additional Information. Not used in RCUK Gateway to Research.:	Open Access article - click on the Official URL link for full text
NORA Subject Terms:	Atmospheric Sciences
Related URLs:	Discussion paper
Date made live:	11 Aug 2011 13:28 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/14874

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