The Brine Content of Sea Ice Measured with a Nuclear Magnetic Resonance Spectrometer

AbstractNuclear magnetic properties of hydrogen are used for the quantitative analysis of the water content of sea ice from 0° C. to −40° C. The data on water content are utilized to calculate the brine volume and brine weight content of the samples. Over a range of water contents of 2% to 96% the standard deviation of the nuclear magnetic resonance data from chemical analysis data is ±0.6%, An estimate of water content in a sample of sea ice at −70° C. is given, and the value of nuclear magnetic resonance measurements for field studies is discussed.

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The Brine Content of Sea Ice Measured with a Nuclear Magnetic Resonance Spectrometer

Journal of Glaciology ◽

10.1017/s0022143000019092 ◽

1966 ◽

Vol 6 (43) ◽

pp. 89-100 ◽

Cited By ~ 21

Author(s):

Charles Richardson ◽

E. E. Keller

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Sea Ice ◽

Water Content ◽

Field Studies ◽

Analysis Data ◽

Nuclear Magnetic Resonance Spectrometer ◽

Magnetic Resonance Data ◽

Weight Content ◽

Nuclear Magnetic

Abstract Nuclear magnetic properties of hydrogen are used for the quantitative analysis of the water content of sea ice from 0° C. to −40° C. The data on water content are utilized to calculate the brine volume and brine weight content of the samples. Over a range of water contents of 2% to 96% the standard deviation of the nuclear magnetic resonance data from chemical analysis data is ±0.6%, An estimate of water content in a sample of sea ice at −70° C. is given, and the value of nuclear magnetic resonance measurements for field studies is discussed.

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Water content estimates of a first-year sea-ice pressure ridge keel from surface-nuclear magnetic resonance tomography

Annals of Glaciology ◽

10.3189/2013aog64a205 ◽

2013 ◽

Vol 54 (64) ◽

pp. 33-43 ◽

Cited By ~ 4

Author(s):

André Nuber ◽

Lasse Rabenstein ◽

Jochen A. Lehmann-Horn ◽

Marian Hertrich ◽

Stefan Hendricks ◽

...

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Sea Ice ◽

Water Content ◽

The Arctic ◽

First Year ◽

Pressure Ridge ◽

Ice Pressure ◽

Water Contents ◽

Nuclear Magnetic

AbstractThe porosity of a sea-ice pressure ridge keel is an important but poorly known variable, relevant for determining the mass budget and evolution of the Arctic sea-ice cover. Determination of keel porosity from drillholes is time-intensive and only yields limited information because of their limited lateral extent. Since the porosity within a keel equals its liquid water content, surface-nuclear magnetic resonance (surface-NMR) methods can be used to estimate porosity within such features. Surface-NMR tomography measurements were made in April 2011 using seven surface coil positions across a first-year pressure ridge on landfast sea ice near Barrow, Alaska, USA. The inversion results indicate water contents of 30 ± 7% and 40 ±10% in the ridge’s shallow and deep parts, respectively. These values are much higher than those obtained from drillholes, which are ∼10% and ∼27%, respectively. In contrast to drilling, surface-NMR tomography yields average porosity values for the entire subsurface volume. However, the inversion process is sensitive to the electrical conductivity distribution; uncertain conductivity estimates limit the reliability of the inverted water contents. Nevertheless, the results suggest that ridge porosities obtained from invasive measurements such as drilling may lead to substantially overestimated sea-ice volume.

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