Characterization of ikaite (CaCO3*6H2O) crystals in first-year Arctic sea ice north of Svalbard: Crystal size and melted-ice total alkalinity


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Michael.Fischer [ at ] awi.de

Abstract

We examined the size distribution of calcium carbonate crystals from first-year Arctic pack ice and overlying snow and slush during spring melt onset north of Svalbard. Ikaite crystals were found mainly in the bottom of the snowpack, in slush and the surface layers of the sea ice, where temperature was lower and salinity higher than in the ice below. Micrographs showed that ikaite crystals were characterized by a roughly elliptical shape with a mean aspect ratio of 1.8. The mean length of the crystals was 85.8 ± 30.2 µm (mean ±1SD) in the lateral direction and 149.3 ± 55.9 µm in the longitudinal direction. Comparisons of the salinity and the total alkalinity for melted-ice samples through the ice column suggest that the precipitation/dissolution of ikaite crystals occurred at the top of the sea ice during the ice formation/melting processes.



Item Type
Conference (Poster)
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Not peer-reviewed
Publication Status
Published
Event Details
International Glaciology Society - International Symposium on Seasonal Snow and Ice, 28 May 2012 - 01 Jun 2012, Lahti, Finland.
Eprint ID
30474
Cite as
Nomura, D. , Granskog, M. , Assmy, P. , Nehrke, G. , Hu, Y. , Fischer, M. and Dieckmann, G. (2012): Characterization of ikaite (CaCO3*6H2O) crystals in first-year Arctic sea ice north of Svalbard: Crystal size and melted-ice total alkalinity , International Glaciology Society - International Symposium on Seasonal Snow and Ice, Lahti, Finland, 28 May 2012 - 1 June 2012 .


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