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- Title
Investigation of coastal sea-fog formation using the WIBS (Wideband Integrated Bioaerosol Sensor) technique.
- Authors
Daly, Shane M.; O'Connor, David J.; Healy, David A.; Hellebust, Stig; Arndt, Jovanna; Feeney, Patrick; Quirke, Michael; McGillicuddy, Eoin; Wenger, John C.; Sodeau, John R.
- Abstract
A 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/fluorescence intensity profiles indicated that the origin of the signals was not biological in nature (i.e. PBAP, 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 best 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). The current field study provides the first direct time-line link between molecular iodine release, particle formation and sea-fog formation. 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.
- Subjects
ULTRA-wideband radar; TERRITORIAL waters; FOG; MICROBIOLOGICAL aerosols; IODINE
- Publication
Atmospheric Chemistry & Physics Discussions, 2018, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2018-673