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Coastal marine methyl iodide source and links to new particle formation at Cape Grim during February 2006


Grose, MR and Cainey, JM and McMinn, A and Gibson, JAE, Coastal marine methyl iodide source and links to new particle formation at Cape Grim during February 2006, Environmental Chemistry, 4, (3) pp. 172-177. ISSN 1448-2517 (2007) [Refereed Article]

DOI: doi:10.1071/EN07008


Methyl iodide concentration in seawater and in the air directly above the sea was measured at an inshore site adjacent to the Cape Grim Baseline Air Pollution Station (Cape Grim BAPS) near a bed of Bull Kelp (Durvillaea potatorum) over daylight cycles and along a transect out to 5 km offshore. Most inshore samples had low and variable methyl iodide concentrations in seawater (14.8?57.7 pM) and in air immediately above the sea (2.1?3.8 parts per trillion by volume), with a partial tidal influence. A period of elevated methyl iodide concentration in the water (144.5 pM) and in air above the sea surface (5.5 pptv) was immediately followed by a measurement of new particles at the Cape Grim BAPS. This correlation provided indirect evidence that emission of methyl iodide from kelp is connected to the new particle formation pathway, but there was no evidence of a direct causal link. Elevated levels of atmospheric methyl iodide were not detected at the station (adjacent to the site but on top of a 94-m cliff) at the same time, which suggests the effect was localised above the sea surface. A rapid decrease of methyl iodide out to 5 km suggested that a source at the coastal reef was greater than from pelagic phytoplankton; this source could be the intertidal kelp beds. © CSIRO 2007.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Atmospheric sciences not elsewhere classified
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Air quality
UTAS Author:Grose, MR (Dr Michael Grose)
UTAS Author:McMinn, A (Professor Andrew McMinn)
UTAS Author:Gibson, JAE (Dr John Gibson)
ID Code:49802
Year Published:2007
Web of Science® Times Cited:7
Deposited By:IASOS
Deposited On:2007-08-01
Last Modified:2009-12-15

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