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Aeolian sediment transport during winter, Black Top Creek, Fosheim Peninsula, Ellesmere Island, Canadian Arctic

Author

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  • Antoni G. Lewkowicz

Abstract

Northerly winds of 25 m s−1, and possibly in excess of 40 m s−1, occurred for about one hour in the Eureka area on 18 February 1991. In the valley of Black Top Creek, the effects of these winds were dominantly (1) deflation of fine sediments on north‐east‐facing slopes, leaving a patchy soil crust perched up to 28 mm above the surrounding surface, and (2) deposition of up to 125 mm of fine and coarse sediments over snow on south‐west‐facing slopes, particularly in rough microtopography within detachment slides. The importance of wind erosion in this arid environment was shown by surface soil loss on a north‐east‐facing slope of 4·8 kg m−2 (4 mm), an amount equivalent to more than 20 years of denudation by water. The maximum size (45 mm long) and weight (25 g) of particles transported during this storm demonstrate that aeolian transportation in the Canadian Arctic, like the Antarctic, is not confined to sand‐sized materials. © 1998 John Wiley & Sons, Ltd. Des vents du nord de 25 m s−1, et probablement atteignant 40 m s−1, se sont exercés pendant une heure dans la région d'Eureka, la 18 février 1991. Dans la vallée du Black Top Creek, ces vents ont entrainé principalement 1) la déflation de sédiments fins sur les pentes exposées au nord, laissant une croûte de sol discontinue perchée à plus de 28 mm au‐dessus de la surface voisine, et 2) le dépôt de plus de 125 mm de sédiments fins et grossiers au dessus de la neige sur les pentes exposées au sud‐ouest, surtout lorsque la microtopographie était rugueuse. L'importance de l'érosion éolienne dans cet environnement aride est montrée par une perte du sol de 4,8 Kg/m2 (4 mm) sur la pente exposée au nord, ce qui représente un total équivalent à plus de 20 ans de dénudation par l'eau courante. La taille maximum (45 mm) et le poids (25 g) des particules transportées pendant cette tempête, démontrent que le transport éolien dans l'arctique comme dans l'antarctique, n'est pas seulement confiné aux matériaux de granulométrie sableuse. © 1998 John Wiley & Sons, Ltd.

Suggested Citation

  • Antoni G. Lewkowicz, 1998. "Aeolian sediment transport during winter, Black Top Creek, Fosheim Peninsula, Ellesmere Island, Canadian Arctic," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 9(1), pages 35-46, January.
  • Handle: RePEc:wly:perpro:v:9:y:1998:i:1:p:35-46
    DOI: 10.1002/(SICI)1099-1530(199801/03)9:13.0.CO;2-L
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