Coastal iodine emissions. 1. Release of I2 by Laminaria digitata in chamber experiments

Show simple item record Ashu-Ayem, Enowmbi R. Nitschke, Udo Monahan, Ciaran Chen, Jun Darby, Steven B. Smith, Paul D. O'Dowd, Colin D. Stengel, Dagmar B. Venables, Dean S. 2012-11-20T12:55:39Z 2013-08-30T04:00:03Z 2012
dc.identifier.citation ASHU-AYEM, E. R., NITSCHKE, U., MONAHAN, C., CHEN, J., DARBY, S. B., SMITH, P. D., O’DOWD, C. D., STENGEL, D. B. & VENABLES, D. S. 2012. Coastal Iodine Emissions. 1. Release of I2 by Laminaria digitata in Chamber Experiments. Environmental Science & Technology, 46, 10413-10421. en
dc.identifier.volume 46 en
dc.identifier.issued 19 en
dc.identifier.startpage 10413 en
dc.identifier.endpage 10421 en
dc.identifier.issn 0013-936X
dc.identifier.doi 10.1021/es204534v
dc.description.abstract Tidally exposed macroalgae emit large amounts of I2 and iodocarbons that produce hotspots of iodine chemistry and intense particle nucleation events in the coastal marine boundary layer. Current emission rates are poorly characterized, however,with reported emission rates varying by 3 orders of magnitude. In this study, I2 emissions from 25 Laminaria digitata samples were investigated in a simulation chamber using incoherent broadbandcavity-enhanced absorption spectroscopy (IBBCEAS). The chamber design allowed gradual extraction of seawater to simulate tidal emersion of algae. Samples were exposed to air with or without O3 and to varying irradiances. Emission of I2 occurred in four distinct stages: (1) moderate emissions from partially submerged samples;(2) a strong release by fully emerged samples; (3) slowing or stopping of I2 release; and (4) later pulses of I2 evident in some samples. Emission rates were highly variable and ranged from 7to 616 pmol min−1 gFW−1 in ozone-free air, with a median value of 55 pmol min−1 gFW−1 for 20 samples. en
dc.description.sponsorship Science Foundation Ireland (07/RFP/GEOF716); Science Foundation Ireland (09/RFP/ CAP2509); Irish Research Council for Science Engineering and Technology (EMBARK initiative) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society en
dc.rights Copyright © 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 en
dc.subject Air pollution and industrial hygiene en
dc.subject Iodine release en
dc.subject Marine boundary layer en
dc.subject.lcsh Marine algae en
dc.title Coastal iodine emissions. 1. Release of I2 by Laminaria digitata in chamber experiments en
dc.type Article (peer-reviewed) en
dc.internal.authorurl en
dc.internal.authorcontactother Dean Venables, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en 2012-10-23T15:08:52Z
dc.description.version Accepted Version en
dc.internal.rssid 168078741
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Irish Research Council for Science Engineering and Technology en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Environmental Science and Technology en
dc.internal.copyrightchecked No. CORA - ROMEO and publisher's website. "It is mandated by the Author(s)’ funding agency, primary employer, or, in the case of Author(s) employed in academia, university administration." en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress en

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