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Quantification of ikaite in Antarctic sea ice

Citation

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 Statement

Copyright 2012 Antarctic Science.

DOI: doi:10.1017/S0954102012001150

Abstract

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 Details

Item Type:Refereed Article
Keywords:ikaite, Antarctica, sea ice,
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Meiners, K (Dr Klaus Meiners)
ID Code:86830
Year Published:2013
Web of Science® Times Cited:15
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-10-26
Last Modified:2017-10-31
Downloads:0

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