Investigation of coastal sea-fog formation using the WIBS (wideband integrated bioaerosol sensor) technique

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dc.contributor.authorDaly, Shane M.
dc.contributor.authorO'Connor, David J.
dc.contributor.authorHealy, David A.
dc.contributor.authorHellebust, Stig
dc.contributor.authorArndt, Jovanna
dc.contributor.authorMcGillicuddy, Eoin J.
dc.contributor.authorFeeney, Patrick
dc.contributor.authorQuirke, Michael
dc.contributor.authorWenger, John C.
dc.contributor.authorSodeau, John R.
dc.contributor.funderEnvironmental Protection Agencyen
dc.date.accessioned2019-11-19T12:14:07Z
dc.date.available2019-11-19T12:14:07Z
dc.date.issued2019-04-30
dc.description.abstractA wideband integrated bioaerosol sensor (WIBS-4) was deployed in Haulbowline Island, Cork Harbour, to detect fluorescence particles in real time during July and September 2011. A scanning mobility particle sizer (SMPS) was also installed providing sizing analysis of the particles over the 10–450 nm range. During the campaign, multiple fog formation events occurred; they coincided with dramatic increases in the recorded fluorescent particle counts. The WIBS sizing and fluorescence intensity profiles indicated that the origin of the signals was potentially non-biological in nature (i.e. PBAPs, primary biological aerosol particles). Furthermore, the data did not support the presence of known fluorescing chemical particles like SOA (secondary organic aerosol). Complementary laboratory studies showed that the field results could potentially be explained by the adsorption of molecular iodine onto water droplets to form I2 ⋅ (H2O)x complexes. The release of iodine into the coastal atmosphere from exposed kelp at low tides has been known for many years. This process leads to the production of small IxOy particles, which can act as cloud condensation nuclei (CCN). While the process of molecular iodine release from coastal kelp sources, subsequent particle formation, and the observations of sea mists and fogs have been studied in detail, this study provides a potential link between the three phenomena. Of mechanistic interest is the fact that molecular iodine included into (rather than on) water droplets does not appear to fluoresce as measured using WIBS instrumentation. The study indicates a previously unsuspected stabilizing transport mechanism for iodine in the marine environment. Hence the stabilization of the molecular form would allow its more extensive distribution throughout the troposphere before eventual photolysis.en
dc.description.sponsorshipClimate Change Research Programme 2007–2013en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationDaly, S.M., O'Connor, D.J., Healy, D.A., Hellebust, S., Arndt, J., McGillicuddy, E.J., Feeney, P., Quirke, M., Wenger, J.C. and Sodeau, J.R., 2019. Investigation of coastal sea-fog formation using the WIBS (wideband integrated bioaerosol sensor) technique. Atmospheric Chemistry and Physics, 19(8), (14pp). DOI:10.5194/acp-19-5737-2019en
dc.identifier.doi10.5194/acp-19-5737-2019en
dc.identifier.eissn1680-7324
dc.identifier.endpage5751en
dc.identifier.issn1680-7316
dc.identifier.issued8en
dc.identifier.journaltitleAtmospheric Chemistry and Physicsen
dc.identifier.startpage5737en
dc.identifier.urihttps://hdl.handle.net/10468/9094
dc.identifier.volume19en
dc.language.isoenen
dc.publisherCopernicus Publications; European Geosciences Union (EGU)en
dc.relation.urihttps://www.atmos-chem-phys.net/19/5737/2019/
dc.rights© Author(s) 2019. Published by Copernicus Publications on behalf of the European Geosciences Union.en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectCoastal sea-fogen
dc.subjectWideband integrated bioaerosol sensor (WIBS-4)en
dc.subjectCork Harbouren
dc.titleInvestigation of coastal sea-fog formation using the WIBS (wideband integrated bioaerosol sensor) techniqueen
dc.typeArticle (peer-reviewed)en
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