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Quantification of ikaite in Antarctic sea ice
Fischer, M and Thomas, DN and Krell, A and Nehrke, G and Gottlicher, J and Norman, L and Meiners, K and Riaux-Gobin, C and Dieckmann, GS, Quantification of ikaite in Antarctic sea ice, Antarctic Science, 25, (3) pp. 421-432. ISSN 0954-1020 (2013) [Refereed Article]
Copyright 2012 Antarctic Science.
Calcium carbonate precipitation in sea ice is thought to potentially drive significant CO2 uptake by the ocean. However, little is known about the quantitative spatial and temporal distribution of CaCO3 within sea ice, although it is hypothesized that high quantities of dissolved organic matter and/or phosphate (common in sea ice) may inhibit its formation. In this quantitative study of hydrous calcium carbonate as ikaite, sea ice cores and brine samples were collected from pack and land fast sea ice between September and December 2007 during two expeditions, one in the East Antarctic sector and the other off Terre Adélie. Samples were analysed for CaCO3, salinity, dissolved organic carbon/nitrogen, inorganic phosphate, and total alkalinity. No relationship between these parameters and CaCO3 precipitation was evident. Ikaite was found mostly in the uppermost layers of sea ice with maximum concentrations of up to 126 mg ikaite per litre melted sea ice being measured, although both the temporal and horizontal spatial distributions of ikaite were highly heterogeneous. The precipitate was also found in the snow on top of the sea ice at some of the sampling locations.
|Item Type:||Refereed Article|
|Keywords:||ikaite, Antarctica, sea ice,|
|Research Division:||Biological Sciences|
|Research Field:||Marine and estuarine ecology (incl. marine ichthyology)|
|Objective Division:||Environmental Management|
|Objective Group:||Management of Antarctic and Southern Ocean environments|
|Objective Field:||Biodiversity in Antarctic and Southern Ocean environments|
|UTAS Author:||Meiners, K (Dr Klaus Meiners)|
|Web of Science® Times Cited:||19|
|Deposited By:||CRC-Antarctic Climate & Ecosystems|
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