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Oxygen isotope fractionation during the freezing of sea water

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Title: Oxygen isotope fractionation during the freezing of sea water
Authors: Toyota, Takenobu Browse this author →KAKEN DB
Smith, Inga J. Browse this author
Gough, Alexander J. Browse this author
Langhorne, Patricia J. Browse this author
Leonard, Gregory H. Browse this author
Van Hale, Robert J. Browse this author
Mahoney, Andrew R. Browse this author
Haskell, Timothy G. Browse this author
Issue Date: 1-Aug-2013
Publisher: Int glaciol soc
Journal Title: Journal of glaciology
Volume: 59
Issue: 216
Start Page: 697
End Page: 710
Publisher DOI: 10.3189/2013JoG12J163
Abstract: The dependence of oxygen isotope fractionation on ice growth rate during the freezing of sea water is investigated based on laboratory experiments and field observations in McMurdo Sound, Antarctica. The laboratory experiments were performed in a tank filled with sea water, with sea ice grown under calm conditions at various room temperatures ranging from -5 degrees C to -20 degrees C. In McMurdo Sound, the ice growth rate was monitored using thermistor probes for first-year landfast ice that grew to similar to 2m in thickness. Combining these datasets allows, for the first time, examination of fractionation at a wide range of growth rates from 0.8 x 10(-7) to 9.3 x 10(-7) m s(-1). In the analysis a stagnant boundary-layer model is parameterized using these two independent datasets. As a result, the optimum values of equilibrium pure-ice fractionation factor and boundary-layer thickness are estimated. It is suggested that a regime shift may occur at a growth rate of similar to 2.0 x 10(-7) m s(-1). A case study on sea ice in the Sea of Okhotsk, where the growth rate is modeled by coupling the thermodynamic properties of the sea ice with meteorological data, demonstrates the utility of the fitted models.
Rights: © 2013 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 豊田 威信

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