Density of Single Crystals of Ice From a Temperate Glacier

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Abstract:

Density of single crystals of ice from the Mendenhall Glacier near Juneau, Alaska, a temperate glacier, was determined by the hydrostatic weighing method. It was found that the densities of single crystals are slightly but measurably variable from one crystal to another. The values range from a minimum of 0.91712 gm./cm.3 to a maximum of 0.91728 gm./cm.3, when corrected for − 3.5° C., for the eight crystals measured. Any imperfections such as Tyndall figures (hexagonal prismatic voids) were immediately evident in the density determinations, and correction for these imperfections give a corrected density essentially the same as that of clear specimens. Two clear crystal aggregate specimens tested had a lower density than the pure single ice crystals. An error computation gives the value of the estimated maximum error of the density determinations as ±2·1 ×10−5 gm./cm.3.

ZUSAMMENFASSUNG. Die Dichte einzelner Eiskristalle wurde mit Hilfe einer hydrostatischen Wägemethode bestimmt. Die Kristalle stammten von Mendenhall Glacier in der Nähe von Juneau in Alaska, der ein temperierter Gletscher ist. Die Dichtewerte einzclner Kristalle sind sehr wenig, aber messbar verschieden. Die Werte für acht Kristalle sćhwankten zwischen 0.91712 g-cm−3 und 0.91728 g-cm−3 bezogen auf −3·5° C. Jegliche Unregelmässigkeiten Z. B. Tyndall-Figureh (hexagonale prismatische Leerräume), zeigen sich sofort in der Dichtemessung. Wenn man für die Hohlräume korrigtert, ergibt sich im Wesentlichen diesclbe Dichte wie für reines Eis. Eine Fehleranalyse ergab ±2·1 ×10−5 als geschätzten maximalen Fehler der Dichtemessungen.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/002214355793702046

Publication date: October 1, 1955

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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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