Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change
Abstract Radiocarbon dates from two sites in the Andes (Ecuador and Peru) confirm that glaciers culminated a readvance after 11 000 yr BP. A moraine stage, equivalent in altitude and position relative to existing glaciers, is present in most glacierized ranges, but its age is equivocal. Broadly limi...
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crwiley:10.1002/jqs.3390080303 2024-06-02T08:11:26+00:00 Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change Clapperton, Chalmers M. 1993 http://dx.doi.org/10.1002/jqs.3390080303 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390080303 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390080303 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 8, issue 3, page 197-215 ISSN 0267-8179 1099-1417 journal-article 1993 crwiley https://doi.org/10.1002/jqs.3390080303 2024-05-03T11:25:21Z Abstract Radiocarbon dates from two sites in the Andes (Ecuador and Peru) confirm that glaciers culminated a readvance after 11 000 yr BP. A moraine stage, equivalent in altitude and position relative to existing glaciers, is present in most glacierized ranges, but its age is equivocal. Broadly limiting dates from Colombia and Peru suggest that the stage may be Late‐glacial, as it is younger than 12100 yr BP, but formed before the early Holocene; in southern Chile a comparable moraine stage is older than ca. 9100 yr BP. Andean glaciers appear to have advanced at least twice during the Late‐glacial interval. Glacier reconstruction from these moraine limits suggests depression of the equilibrium line altitude by at least 300–400 m in the northern and north‐central Andes, and possibly less than this farther south. Late‐glacial climatic change occurred globally and possibly reflects North Atlantic temperature and circulation changes forced by deglaciation of the northern ice sheets, migrations north and south of the Atlantic Polar Front, and the switching off and on of a ‘dust pump’ in low midlatitudes. Article in Journal/Newspaper North Atlantic Wiley Online Library Journal of Quaternary Science 8 3 197 215 |
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Wiley Online Library |
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English |
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Abstract Radiocarbon dates from two sites in the Andes (Ecuador and Peru) confirm that glaciers culminated a readvance after 11 000 yr BP. A moraine stage, equivalent in altitude and position relative to existing glaciers, is present in most glacierized ranges, but its age is equivocal. Broadly limiting dates from Colombia and Peru suggest that the stage may be Late‐glacial, as it is younger than 12100 yr BP, but formed before the early Holocene; in southern Chile a comparable moraine stage is older than ca. 9100 yr BP. Andean glaciers appear to have advanced at least twice during the Late‐glacial interval. Glacier reconstruction from these moraine limits suggests depression of the equilibrium line altitude by at least 300–400 m in the northern and north‐central Andes, and possibly less than this farther south. Late‐glacial climatic change occurred globally and possibly reflects North Atlantic temperature and circulation changes forced by deglaciation of the northern ice sheets, migrations north and south of the Atlantic Polar Front, and the switching off and on of a ‘dust pump’ in low midlatitudes. |
format |
Article in Journal/Newspaper |
author |
Clapperton, Chalmers M. |
spellingShingle |
Clapperton, Chalmers M. Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
author_facet |
Clapperton, Chalmers M. |
author_sort |
Clapperton, Chalmers M. |
title |
Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
title_short |
Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
title_full |
Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
title_fullStr |
Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
title_full_unstemmed |
Glacier readvances in the Andes at 12 500–10 000 YR BP: Implications for mechanism of Late‐glacial climatic change |
title_sort |
glacier readvances in the andes at 12 500–10 000 yr bp: implications for mechanism of late‐glacial climatic change |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.1002/jqs.3390080303 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390080303 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390080303 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Quaternary Science volume 8, issue 3, page 197-215 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3390080303 |
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Journal of Quaternary Science |
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8 |
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3 |
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197 |
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215 |
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1800757581988233216 |