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Nuclear magnetic resonance study of sea-water freezing mechanisms: 2. Temperature dependence of relaxation time of protons in sea-ice brine

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Abstract:

Results of determinations of proton magnetic relaxation time (T 1) in the liquid phase of frozen sea water at temperatures between –2°C and –38°C, with variable rate and direction of temperature change, are presented. Temperature 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 T 1, as in the analogous dependence of brine content. It is shown that formation of crystalline hydrates in brine is preceded by complete solvation of ions at –5 to –6°C. The main causes of hysteresis in temperature dependence of T 1 and the extension of loop limits compared with the analogous loop for liquid brine content are indicated. Additional potentialities of using the nuclear magnetic resonance method for investigating sea-ice properties are presented.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/2013JoG12J240

Publication date: August 1, 2013

More about this publication?
  • 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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