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Thermal Effects of Crevassing on Steele Glacier, Yukon Territory, Canada

  • Gary T. Jarvis (a1) and Garry K. C. Clarke (a1)

Abstract

Ice temperature measurements have been made in Steele Glacier to a depth of 114 m. All measured temperatures were below 0° C, the coldest being –6.5° C at a depth of 114 m. The temperature profile indicates an anomalously warm layer of ice between 30 m and 50 m, which is probably due to the freezing of water in crevasses opened during the 1965–66 surge. A two-dimensional model of a cold glacier with partially water-filled crevasses predicts temperature profiles very similar to that observed.

Des mesures de températures ont été faites sur le Steele Glacier jusqu’à une profondeur de 114 m. Toutes les températures mesurées étaient négatives, les plus froides étant –6,5° C à une profondeur de 114 m. Le profil des températures montre un réseau de glace anormalement chaud entre 30 et 50 m, qui est probablement dû au regel d’eau dans les crevasses ouvertes pendant la crue de 1965–66. Un modèle bidimensionnel de glacier froid avec des crevasses partiellement remplies d’eau fait prévoir des profils de température très semblables à ceux observés.

Zusammenfassung

Im Steele Glacier wurden Eistemperaturen bis zu einer Tiefe von 114 m gemessen. Alle Temperaturen lagen unter 0° C, die tiefste betrug –6,5° C in 114 m Tiefe. Das Temperaturprofil weist auf eine ungewöhnlich warme Eisschicht zwischen 30 m und 50 m hin, die vermutlich auf das Gefrieren von Wasser in Spalten zurückzuführen ist, die sich während des Ausbruches von 1965/66 geöffnet haben. Ein zweidimensionales Modell eines kalten Gletschers mit teilweise wassergefüllten Spatten lässt Temperaturprofile erwarten, die dem beobachteten sehr ähnlich sind.

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Copyright

References

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