Calcium carbonate as ikaite crystals in Antarctic sea ice

[1] We report on the discovery of the mineral ikaite (CaCO 3 6H 2O) in sea-ice from the Southern Ocean. The precipitation of CaCO 3 during the freezing of seawater has previously been predicted from thermodynamic modelling, indirect measurements, and has been documented in artificial sea ice during...

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Bibliographic Details
Main Authors: Gerhard S. Dieckmann, Gernot Nehrke, Stathys Papadimitriou, Jörg Göttlicher, Ralph Steininger, Hilary Kennedy, Dieter Wolf-gladrow, David N. Thomas, Regions Citation Dieckmann, G. Nehrke, J. Göttlicher, R. Steininger, H. Kennedy, D. Wolf
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
doi
10.1029/2008GL033540
Antarctic
Southern Ocean
Antarc*
Sea ice
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.174.3729
http://www.sos.bangor.ac.uk/staff/pdf/DT_2008GL033540.pdf
Description
Summary:[1] We report on the discovery of the mineral ikaite (CaCO 3 6H 2O) in sea-ice from the Southern Ocean. The precipitation of CaCO 3 during the freezing of seawater has previously been predicted from thermodynamic modelling, indirect measurements, and has been documented in artificial sea ice during laboratory experiments but has not been reported for natural sea-ice. It is assumed that CaCO3 formation in sea ice may be important for a sea ice-driven carbon pump in ice-covered oceanic waters. Without direct evidence of CaCO3 precipitation in sea ice, its role in this and other processes has remained speculative. The discovery of CaCO3 6H2O crystals in natural sea ice provides the necessary evidence for the evaluation of previous assumptions and lays the foundation for further studies to help elucidate the role of ikaite in the carbon cycle of the seasonally sea icecovered

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