Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 5 2009 10.5194/acpd-9-20567-2009 http://www.atmos-chem-phys-discuss.net/9/20567/2009/ http://www.atmos-chem-phys-discuss.net/9/20567/2009/acpd-9-20567-2009.html http://www.atmos-chem-phys-discuss.net/9/20567/2009/acpd-9-20567-2009.pdf 20567 20597 2009-09-30 Simultaneous coastal measurements of ozone deposition fluxes and iodine-mediated particle emission fluxes with subsequent CCN formation J. D. Whitehead G. McFiggans g.mcfiggans@manchester.ac.uk M. W. Gallagher M. J. Flynn Centre for Atmospheric Science, The University of Manchester, Simon Building, Oxford Road, Manchester, M13 9PL, UK Here we present the first observations of simultaneous ozone deposition fluxes and ultrafine particle emission fluxes over an extensive infra-littoral zone. Fluxes were measured by the eddy covariance technique at the Station Biologique de Roscoff, on the coast of Brittany, north-west France. This site overlooks a very wide (3 km) littoral zone controlled by very deep tides (9.6 m) exposing extensive macroalgae beds available for significant iodine mediated photochemical production of ultrafine particles. The aspect at the Station Biologique de Roscoff provides an extensive and relatively flat, uniform fetch within which micrometeorological techniques may be utilized to study links between ozone deposition to macroalgae (and sea water) and ultrafine particle production. Ozone deposition to seawater at high tide was significantly slower (vd[O3]=0.302±0.095 mm s−1) than low tidal deposition. A statistically significant difference in the deposition velocities to macroalgae at low tide was observed between night time (vd[O3]=1.00±0.10 mm s−1) and daytime (vd[O3]=2.05±0.16s−1) when ultrafine particle formation results in apparent particle emission. 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