Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 46, Issue 19, Pages 10413-10421Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es204534v
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Funding
- Science Foundation Ireland [07/RFP/GEOF716, 09/RFP/CAP2509]
- Irish Research Council for Science, Engineering and Technology (IRCSET Embark Initiative)
- Science Foundation Ireland (SFI) [07/RFP/GEOF716, 09/RFP/CAP2509] Funding Source: Science Foundation Ireland (SFI)
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Tidally exposed macroalgae emit large amounts of I-2 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, I-2 emissions from 25 Laminaria digitata samples were investigated in a simulation chamber using incoherent broadband cavity-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 O-3 and to varying irradiances. Emission of I-2 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 I-2 release; and (4) later pulses of I-2 evident in some samples. Emission rates were highly variable and ranged from 7 to 616 pmol min(-1) gFW(-1) in ozone-free air, with a median value of 55 min(-1) gFW(-1) for 20 samples.
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