Details

Autor(en) / Beteiligte

• Mel’nichenko, N.A.
• Slobodyuk, A.B.

Titel

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

Ist Teil von

• Journal of glaciology, 2013-01, Vol.59 (216), p.711-718

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2013

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 seawater 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.