Frost-table and Thaw Depths in the Littoral Zone near Peard Bay, Alaska
ABSTRACT. Measurements were made of thaw depths and of sub-surface tem-peratures along four beach profiles, between late May and late August. On the upper beach levels, thaw proceeded rapidly following the disappearance of surface snow, but then became much slower. Near the water line, thaw was dela...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.510.6429 http://pubs.aina.ucalgary.ca/arctic/arctic30-3-155.pdf |
| Summary: | ABSTRACT. Measurements were made of thaw depths and of sub-surface tem-peratures along four beach profiles, between late May and late August. On the upper beach levels, thaw proceeded rapidly following the disappearance of surface snow, but then became much slower. Near the water line, thaw was delayed by the presence of beach-fast ice, but thereafter increased steadily to greater depths than on the upper beach. Greater thaw depths were reached on barrier beaches than on beaches backed by tundra. On the upper beach, thaw depths and zero-degree depths did not differ significantly, but near the water line they were at variance due to the presence of saline pore waters. &UM & Table de gel et profondeurs du dkgel dans la zone du littoral, pr2s de Peard Bay, Alaska. On mesura, sur une p6riode s’Ctendant de la fin mai B la fin aofit et le long de quatre lignes trades en travers des plages, les profondeurs respec-tives des mnes de dCgel, ainsi que les tempiratures profondes correspondantes. A des niveaux de plage ClevCs, le d6gel se poursuivit rapidement aprBs la disparition de la neige de surface, pour ensuite se ralentir consid6rablement. Par contre, le long du rivage, le dCgel se poursuivit lentement tant qu’il restait de la glace dans la mer, mais ensuite, la profondeur du dCgel augmenta considCrablement pour atteindre des profondeurs plus grandes que celles des niveaux de plage plus ClevCs. Les zones de dCgel atteignirent des profondeurs plus importantes sur les cordons littoraux que sur les plages qui se prolongeaient par la toundra. A des niveaux de plage ClevCs, on n’enregistra pas de diffkrences significatives entre la profondeur des zones de dCgel et de celles de ziro degrC de tempkrature, alors que, prbs du rivage, elles ne co’incidaient pas, B cause de la prhence de pores d’eau salBe entre les grains de sable. |
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