Distribution of permafrost in North America and its relationship to the environment: a review, 1963-1973
Knowledge of the distribution of permafrost in North America and related environmental factors which has been accumulated during the past ten years, 1963-73, since the First International Conference on Permafrost is reviewed. Several permafrost maps of Canada and Alaska were published. Considerable...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
National Academy of Sciences
1973
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| Subjects: | |
| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=9b5d7998-deb5-4941-86cb-f61f62fe3556 https://nrc-publications.canada.ca/eng/view/object/?id=9b5d7998-deb5-4941-86cb-f61f62fe3556 https://nrc-publications.canada.ca/fra/voir/objet/?id=9b5d7998-deb5-4941-86cb-f61f62fe3556 |
| Summary: | Knowledge of the distribution of permafrost in North America and related environmental factors which has been accumulated during the past ten years, 1963-73, since the First International Conference on Permafrost is reviewed. Several permafrost maps of Canada and Alaska were published. Considerable advance was made in the understanding of climatic and terrain factors such as relief, vegetation, hydrology, snow cover, fire, soil and rock, and glacier ice. Investigations on the distribution of ground ice features associated with permafrost, including pingos, ice wedges, palsas and thermokarst, are surveyed, and work on other periglacial features such as rock glaciers, altiplanation terraces, solifluction features, string bogs, extinct pingos, and ice wedge casts, are described. The past distribution and chronology of permafrost received considerable attention during the last decade. The paper ends with a list of recommendations for future investigations in this aspect of permafrost research. Les auteurs font un exposé de synthèse sur les connaissances acquises de 1963 à 1973, c'est-à-dire depuis la première conférence internationale sur le pergélisol, en ce qui concerne la distribution du pergélisol en Amérique du Nord et les phénomènes connexes de l'environnement. Plusieurs cartes du pergélisol au Canada et en Alaska ont été publié es. On a fait d'importants progrès quant à la connaissance des facteurs climatiques et topographiques, y compris le relief, la végétation, l'hydrologie, la couverture de neige, l'incendie, le sol et la roche et la glace de glacier. Les auteurs passent en revue les études de la distribution des phénomènes de glace interne liés au pergélisol, y compris les pingos, les coins de glace, les palses et le thermokarst, et décrivent les travaux portant sur d'autres phénomènes périglaciaires comme les glaciers de pierre, les terrasses d'altiplanation, les phénomènes de solifluxion, les tourbières en arêtes ("string bogs"), les pingos asséché s et les fentes en coin fossiles. La chronologie du ... |
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