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Characterization of ikaite (CaCO3·6H2O) crystals in first-year Arctic sea ice north of Svalbard

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Title: Characterization of ikaite (CaCO3·6H2O) crystals in first-year Arctic sea ice north of Svalbard
Authors: Nomura, Daiki Browse this author →KAKEN DB
Assmy, Philipp Browse this author
Nehrke, Gernot Browse this author
Granskog, Mats A. Browse this author
Fischer, Michael Browse this author
Dieckmann, Gerhard S. Browse this author
Fransson, Agneta Browse this author
Hu, Yubin Browse this author
Schnetger, Bernhard Browse this author
Issue Date: 2013
Publisher: Cambridge University Press
Journal Title: Annals of Glaciology
Volume: 54
Issue: 62
Start Page: 125
End Page: 131
Publisher DOI: 10.3189/2013AoG62A034
Abstract: We identified ikaite crystals (CaCO3 ·6H2O) and examined their shape and size distribution in first-year Arctic pack ice, overlying snow and slush layers during the spring melt onset north of Svalbard. Additional measurements of total alkalinity (TA) were made for melted snow and sea-ice samples. Ikaite crystals were mainly found in the bottom of the snowpack, in slush and the surface layers of the sea ice where the temperature was generally lower and salinity higher than in the ice below. Image analysis showed that ikaite crystals were characterized by a roughly elliptical shape and a maximum caliper diameter of 201.0±115.9 μm (n = 918). Since the ice-melting season had already started, ikaite crystals may already have begun to dissolve, which might explain the lack of a relationship between ikaite crystal size and sea-ice parameters (temperature, salinity, and thickness of snow and ice). Comparisons of salinity and TA profiles for melted ice samples suggest that the precipitation/dissolution of ikaite crystals occurred at the top of the sea ice and the bottom of the snowpack during ice formation/melting processes.
Rights: © 2013 International Glaciological Society
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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