Coastal iodine emissions: part 2. Chamber experiments of particle formation from Laminaria digitata-derived and laboratory-generated I2

dc.contributor.authorMonahan, Ciaran
dc.contributor.authorAshu-Ayem, Enowmbi R.
dc.contributor.authorNitschke, Udo
dc.contributor.authorDarby, Steven B.
dc.contributor.authorSmith, Paul D.
dc.contributor.authorStengel, Dagmar B.
dc.contributor.authorVenables, Dean S.
dc.contributor.authorO'Dowd, Colin D.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderIrish Research Council for Science Engineering and Technologyen
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2012-11-20T13:00:19Z
dc.date.issued2012
dc.date.updated2012-10-23T15:08:35Z
dc.description.abstractLaboratory studies into particle formation from Laminaria digitata macroalgae were undertaken to elucidate aerosol formation for a range of I2 (0.3−76 ppbv) and O3(<3−96 ppbv) mixing ratios and light levels (EPAR = 15, 100,and 235 μmol photons m−2 s−1). No clear pattern was observed for I2 or aerosol parameters as a function of light levels. Aerosol mass fluxes and particle number concentrations,were, however, correlated with I2 mixing ratios for low O3mixing ratios of <3 ppbv (R2 = 0.7 and 0.83, respectively for low light levels, and R2 = 0.95 and 0.98, respectively for medium lightlevels). Additional experiments into particle production as a function of laboratory-generated I2, over a mixing ratio range of 1−8ppbv, were conducted under moderate O3 mixing ratios (∼24 ppbv) where a clear, 100-fold or greater, increase in the aeroso lnumber concentrations and mass fluxes was observed compared to the low O3 experiments. A linear relationship between particle concentration and I2 was found, in reasonable agreement with previous studies. Scaling the laboratory relationship to aerosol concentrations typical of the coastal boundary layer suggests a I2 mixing ratio range of 6−93 pptv can account for the observed particle production events. Aerosol number concentration produced from I2 is more than a factor of 10 higher than thatproduced from CH2I2 for the same mixing ratios.en
dc.description.sponsorshipScience Foundation Ireland (07/RFP/GEOF716); Science Foundation Ireland (09/RFP/CAP2509); Irish Research Council for Science Engineering and Technology (EMBARK); European Commission (FP6 - EUCAARI) ; European Commission (FP5 -MAP); European Commission (FP6 - EUSAAR)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMONAHAN, C., ASHU-AYEM, E. R., NITSCHKE, U., DARBY, S. B., SMITH, P. D., STENGEL, D. B., VENABLES, D. S. & O’DOWD, C. D. 2012. Coastal Iodine Emissions: Part 2. Chamber Experiments of Particle Formation from Laminaria digitata-Derived and Laboratory-Generated I2. Environmental Science & Technology, 46, 10422-10428. doi: 10.1021/es3011805en
dc.identifier.doi10.1021/es3011805
dc.identifier.endpage10428en
dc.identifier.issn0013-936X
dc.identifier.journaltitleEnvironmental Science and Technologyen
dc.identifier.startpage10422en
dc.identifier.urihttps://hdl.handle.net/10468/788
dc.identifier.volume46en
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.relation.ispartofMarine Boundary Layer: Ocean Atmospheric Interactions
dc.rightsCopyright © 2012 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/es3011805en
dc.subjectAir Pollution and Industrial hygieneen
dc.subjectMarine boundary layeren
dc.subjectIodine releaseen
dc.subject.lcshMarine algaeen
dc.titleCoastal iodine emissions: part 2. Chamber experiments of particle formation from Laminaria digitata-derived and laboratory-generated I2en
dc.typeArticle (peer-reviewed)en
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