Nuclear magnetic resonance study of sea-water freezing mechanisms: 1. Temperature dependence of relative brine content in sea ice

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Abstract:

The results of measuring relative brine content (Q lm) in the liquid phase of frozen sea water at temperatures between –2°C and –43°C with variable rate and direction of temperature change are presented. Various pulsed and steady-state nuclear magnetic resonance (NMR) methods are used and the results are compared with data in the literature. Temperature dependences of Q lm in sea water with dry NaCl added are given. Quasi-hysteresis corresponding to the crystallization range of certain sea-water salts, mainly NaCl, which partially precipitates as the crystalline hydrate NaCl 2H2O at temperatures below –23°C, is detected in the temperature dependence of Q lm. The reasons why Q lm values, under various experimental conditions, differ from data in the literature are explained. Brine salinity (S) is calculated from the relative intensity of NMR signals of Q l, and agrees well with previously published data over a wide temperature range. It is shown that determining Q lm from base measurements of Q l in ice does not require information about brine salinity. Empirical equations for calculating brine content at different sea-water temperatures and salinity are given.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/2013JoG12J239

Publication date: August 1, 2013

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  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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