The Structure and Dynamics of Earth Hummocks in the Subarctic Forest Near Inuvik, Northwest Territories, Canada
| Autor: | S. V. Kokelj, C. Tarnocai, C. R. Burn |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Arctic, Antarctic, and Alpine Research. 39:99-109 |
| ISSN: | 1938-4246 1523-0430 |
| Popis: | Surface microrelief, permafrost table configuration, ground-ice, and soil organic-matter contents are described for three sites near Inuvik, N.W.T., that are characterized by collapsed, poorly developed, and well-developed earth hummocks, respectively. The diameters of collapsed earth hummocks were significantly greater than those of well-developed vegetated hummocks. Hummock relief and interhummock distance increased along the continuum of forms, with the widest spacing and greatest relief measured at the site with well-developed vegetated hummocks. A bowl-shaped permafrost table mirrored the surface relief of most hummocks, but the collapsed hummocks were underlain by a planar or domed permafrost table. Segregated ice lenses parallel to the permafrost table, and small bodies of intrusive ice, were observed beneath the developing and well-developed hummocks. The configuration of the permafrost table and hummock relief, long-term observations of active-layer and hummock change, and hummock respon... |
| Databáze: | OpenAIRE |
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