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An Ablation Rate for Lake Fryxell, Victoria Land, Antarctica

  • R. A. Henderson (a1), W. M. Prebble (a1), R. A. Hoare (a1), K. B. Popplewell (a1), D. A. House (a1) and A. T. Wilson (a1)...
Abstract

The average yearly net ablation rate on permanently ice-covered Lake Fryxell, Victoria Land, Antarctica, is 30 to 40 cm. This figure was calculated by a novel method utilizing a record of ablation which is incorporated in the ice cover of the lake. These values are higher than those measured on Ross Island 80 km. to the east; the difference in ablation rates for the two areas is attributed to the prevalence of katabatic winds in the climate of Taylor Valley. The Lake Fryxell ablation figure is applied to nearby Canada and Commonwealth Glaciers in the calculation of their ice budgets.

Résumé

La valeur moyenne annuelle de l’ablation nette de la glace permanente qui recouvre le Lake Fryxell, Victoria Land, Antarctique, est de 30 à 40 cm. Cette valeur a été calculée par une nouvelle méthode utilisant l’enregistrement de l’ablation qui est incorporé dans la glace du lac. Ces valeurs sont plus fortes que celles mesurées sur Ross Island 80 km à l’est; la différence de valeurs d’ablation pour les deux régions est attribuée à la prédominance des vents catabatiques dans le climat de Taylor Valley. La valeur de l’ablation du Lake Fryxell est appliquée aux proches du Canada et Commonwealth Glaciers pour le calcul de leur bilan.

Zusammenfassung

Die mittlere jährliche Netto-ablation auf dem ständig eisbedeckten Lake Fryxell in Victoria Land, Antarktika, beträgt 30 bis 40 cm. Diese Zahl wurde mit einer neuartigen Methode bestimmt, die ein in die Eisdecke des Sees eingelassenes Ablationsmessgerät benutzt. Sie ist höher als die Werte, die 80 km weiter östlich auf der Ross Island gemessen wurden. Der Unterschied in der Ablationsgeschwindigkeit zwischen den beiden Gebieten wird auf das Vorherrschen katabatischer Winde im Klima des Taylor Valley zurückgeführt. Der Ablationswert des Lake Fryxell wird zur Berechnung des Eishaushaltcs der benachbarten Canada und Commonwealth Glaciers verwendet.

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Copyright
References
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Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
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