Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile
Glacial sediments and landforms preserved beside the Strait of Magellan record repeated advances of an outlet of the Patagonian Icefield during and following the last glacial maximum (LGM; ∼25,000–14,000 14 C yr B.P.). Ice-marginal landform assemblages consist of thrust moraine complexes, kame and k...
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crcambridgeupr:10.1006/qres.2000.2140 2024-06-09T07:46:40+00:00 Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile Benn, Douglas I. Clapperton, C. M. 2000 http://dx.doi.org/10.1006/qres.2000.2140 http://api.elsevier.com/content/article/PII:S0033589400921409?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589400921409?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400026089 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 54, issue 1, page 13-23 ISSN 0033-5894 1096-0287 journal-article 2000 crcambridgeupr https://doi.org/10.1006/qres.2000.2140 2024-05-15T13:14:29Z Glacial sediments and landforms preserved beside the Strait of Magellan record repeated advances of an outlet of the Patagonian Icefield during and following the last glacial maximum (LGM; ∼25,000–14,000 14 C yr B.P.). Ice-marginal landform assemblages consist of thrust moraine complexes, kame and kettle topography, and lateral meltwater channels, very similar to those found at the margins of modern subpolar glaciers. Taken together with other forms of paleoenvironmental evidence, the landform assemblages show that, during the LGM and late-glacial time, permafrost occurred near sea level in southernmost South America. This finding implies that mean annual temperatures were ∼7–8°C lower than at present, somewhat lower than those reconstructed by current glacier–climatic models. Comparison with precipitation–temperature relationships for modern glaciers suggests, in addition, that precipitation levels were lower than today. Reduced glacial-age precipitation may have resulted from a precipitation shadow induced by the Patagonian Icefield, an equatorward migration of the average position of westerly cyclonic storm tracks in the southern midlatitudes, or both these factors. Article in Journal/Newspaper Ice permafrost Cambridge University Press Quaternary Research 54 1 13 23 |
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Open Polar |
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Cambridge University Press |
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language |
English |
description |
Glacial sediments and landforms preserved beside the Strait of Magellan record repeated advances of an outlet of the Patagonian Icefield during and following the last glacial maximum (LGM; ∼25,000–14,000 14 C yr B.P.). Ice-marginal landform assemblages consist of thrust moraine complexes, kame and kettle topography, and lateral meltwater channels, very similar to those found at the margins of modern subpolar glaciers. Taken together with other forms of paleoenvironmental evidence, the landform assemblages show that, during the LGM and late-glacial time, permafrost occurred near sea level in southernmost South America. This finding implies that mean annual temperatures were ∼7–8°C lower than at present, somewhat lower than those reconstructed by current glacier–climatic models. Comparison with precipitation–temperature relationships for modern glaciers suggests, in addition, that precipitation levels were lower than today. Reduced glacial-age precipitation may have resulted from a precipitation shadow induced by the Patagonian Icefield, an equatorward migration of the average position of westerly cyclonic storm tracks in the southern midlatitudes, or both these factors. |
format |
Article in Journal/Newspaper |
author |
Benn, Douglas I. Clapperton, C. M. |
spellingShingle |
Benn, Douglas I. Clapperton, C. M. Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
author_facet |
Benn, Douglas I. Clapperton, C. M. |
author_sort |
Benn, Douglas I. |
title |
Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
title_short |
Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
title_full |
Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
title_fullStr |
Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
title_full_unstemmed |
Glacial Sediment–Landform Associations and Paleoclimate during the Last Glaciation, Strait of Magellan, Chile |
title_sort |
glacial sediment–landform associations and paleoclimate during the last glaciation, strait of magellan, chile |
publisher |
Cambridge University Press (CUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1006/qres.2000.2140 http://api.elsevier.com/content/article/PII:S0033589400921409?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589400921409?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400026089 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Quaternary Research volume 54, issue 1, page 13-23 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.2000.2140 |
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Quaternary Research |
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54 |
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1 |
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13 |
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23 |
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1801376625780064256 |