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Precursors to Particles (P2P) at Cape Grim 2006: campaign overview


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Cainey, JM, Steele, P, Harvey, M, Kreher, K, Stein, T, Ibrahim, O, Ristovski, ZD, Johnson, G, Fletcher, CA, Bigg, EK, Gras, JL, Keywood, M, Grose, MR, Krummel, PJA, Galbally, IE, Johnston, P, Gillett, RW, Meyer, M and Fraser, P 2007 , 'Precursors to Particles (P2P) at Cape Grim 2006: campaign overview' , Environmental Chemistry, vol. 4, no. 3 , pp. 143-150 , doi: 10.1071/EN07041.

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Iodine emissions from coastal macroalgae have been found to be important initiators for nucleation events at Mace Head, Ireland. The source of this iodine is the large beds of the brown kelp Laminaria digitata, which are significantly exposed at low tide.
On the coast around Cape Grim, Tasmania, there are beds of the brown kelp Durvillaea potatrum. The Precursors to Particles 2006 (P2P 2006) campaign at the Cape Grim Baseline Air Pollution Station in late summer (February) 2006 focused on the role of this local kelp in providing precursor gases to particle formation.
Durvillaea potatorum does not produce iodated precursor gases at the levels observed at Mace Head. IO was measured at 0.5 ± 0.3 ppt, while OIO was below detection limits (9 ppt). The dominant atmospheric iodated species was methyl iodide and the average concentration measured at the Cape Grim Station was 1.5 ± 0.3 pptv in baseline conditions, but showed significant variation in discrete samples collected immediately above the ocean surface.
Nucleation events were not detected at the Cape Grim Station, except for one period where the plume of a local bushfire interacted with air of marine origin. The passage of four fronts did not result in nucleation bursts and measurements on the beach 94 m below the Cape Grim Station suggested that Durvillaea potatorum was only a weak source of new particles.

Item Type: Article
Authors/Creators:Cainey, JM and Steele, P and Harvey, M and Kreher, K and Stein, T and Ibrahim, O and Ristovski, ZD and Johnson, G and Fletcher, CA and Bigg, EK and Gras, JL and Keywood, M and Grose, MR and Krummel, PJA and Galbally, IE and Johnston, P and Gillett, RW and Meyer, M and Fraser, P
Keywords: iodine, kelp, methyl iodide, particle formation.
Journal or Publication Title: Environmental Chemistry
Publisher: CSIRO Publishing
ISSN: 1448-2517
DOI / ID Number: 10.1071/EN07041
Additional Information:

Copyright © 2007 CSIRO.

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