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Recent Dynamics of Subarctic Dunes as Determined by Tree-Ring Analysis of White Spruce, Hudson Bay, Québec

Published online by Cambridge University Press:  20 January 2017

Pierre Marin
Affiliation:
Centre d'études nordiques, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 Département de Géographie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
Louise Filion
Affiliation:
Centre d'études nordiques, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 Département de Géographie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4

Abstract

The radial-growth patterns of white spruce were studied on a number of trees growing in subarctic dunes along the eastern coast of Hudson Bay to calculate the rates of accumulation, erosion, and migration of cold-climate sand dunes. The average rate of sand accumulation in sheltered dunes (forest sites) was 2.5 to 3.3 cm/yr, which is two to three times lower than in highly exposed dunes with a rate of sedimentation of 7.65 cm/yr. The average erosion rate was 1.4–1.7 cm/yr, about two times lower than the accumulation rate. The migration rate of sheltered dunes was 18 to 30 cm/yr, three to five times lower than for an exposed dune which advanced at a speed of 74 cm/yr. This migration rate established for highly exposed dunes in the Subarctic with tree-ring methods is about 10 times lower than that established for a barchan in the Sahara with other methods.

Type
Research Article
Copyright
University of Washington

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