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Apparent Short-Term Glacier Velocity Variations

  • Jørn-Ole Andreasen (a1)

Abstract

In connection with a glacier-hydrological project at a sub-polar glacier in West Greenland, short-term glacier velocity variations were measured. Both the horizontal and the vertical velocity components showed distinct diurnal variations. Close examination indicates that these variations are caused by the change in atmospheric refraction during the day, with the vertical component as the most important.

Résumé

Les variatians apparentes de vitesses du glacier sur de courts espaces de temps. Dans le cadre d’un projet d’étude hydrologique sur un glacier sub-polaire de l’ouest du Groenland, des variations de vitesse sur de courtes périodes de temps ont été mesurées. Les deux composantes de la vitesse, horizontale et verticale ont montré des variations diurnes distinctes. Un examen détaillé de ces variations montrent qu’elles sont le résultat des variations diurnes de la réfraction atmosphérique, l’effet sur la composante verticale étant le plus important.

Zusammenfassung

Scheinbare kurzzeitige Schwankungen der Gletscher-Geschwindigkeit. In Verbindung mit einem glazial-hydrologischen Projekt an einem subpolaren Gletscher in West-Grönland wurden kurzzeitige Schwankungen der Gletscher-Geschwindigkeit gemessen. Sowohl die horizontalen wie die vertikalen Geschwindigkeitskomponenten zeigten deutliche Tagesschwankungen Genauere Untersuchungen ergaben, dass diese Schwankungen durch Veränderungen der atmosphärischen Refraktion während des Tages hervorgerufen werden, wobei die Vertikalkomponente bei weitem überwiegt.

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Copyright

References

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Apparent Short-Term Glacier Velocity Variations

  • Jørn-Ole Andreasen (a1)

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