A Younger Dryas Icecap in the Equatorial Andes
Abstract Morphologic and stratigraphic evidence shows that a late-glacial ice cap existed on part of the Eastern Cordillera of Ecuador (Lat. 0° 20′ S) on ground with a mean elevation of 4200 m where none exists now. An outlet glacier from an ca. 800 km 2 ice cap terminated at 3850 m altitude in the...
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1006/qres.1996.1861 http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400038515 |
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crcambridgeupr:10.1006/qres.1996.1861 2024-09-15T18:11:44+00:00 A Younger Dryas Icecap in the Equatorial Andes Clapperton, Chalmers M. Hall, Minard Mothes, Patricia Hole, Malcolm J. Still, John W. Helmens, Karin F. Kuhry, Peter Gemmell, Alastair M.D. 1997 http://dx.doi.org/10.1006/qres.1996.1861 http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400038515 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 47, issue 1, page 13-28 ISSN 0033-5894 1096-0287 journal-article 1997 crcambridgeupr https://doi.org/10.1006/qres.1996.1861 2024-08-28T04:02:40Z Abstract Morphologic and stratigraphic evidence shows that a late-glacial ice cap existed on part of the Eastern Cordillera of Ecuador (Lat. 0° 20′ S) on ground with a mean elevation of 4200 m where none exists now. An outlet glacier from an ca. 800 km 2 ice cap terminated at 3850 m altitude in the Papallacta valley on the eastern side of the plateau. Radiocarbon dates show that moraines formed by this advance were ice-free by 13,200 14 C yr B.P. Tephras and the age of organic deposits at the plateau edge indicate ice-free conditions before 11,800 14 C yr B.P. This interval was followed by the expansion of an ca. 140 km 2 ice cap that discharged glaciers into adjacent valleys where terminal moraines were built at 3950 m altitude. AMS and conventional radiocarbon dates from macrofossils, peat, and gyttja above and below till of the readvance indicate that the ice cap formed between ca. 11,000 and 10,000 14 C yr B.P. and was thus coeval with the European Younger Dryas event. The ice cap developed in response to a surface temperature cooling of at least 3°C in the tropical Andes, a finding that is consistent with a coupled equatorial/high latitude North Atlantic climate system operating at the late-glacial/Holocene transition. These results are further evidence that Younger Dryas cooling may have been a global event. Article in Journal/Newspaper Ice cap North Atlantic Cambridge University Press Quaternary Research 47 1 13 28 |
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Cambridge University Press |
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English |
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Abstract Morphologic and stratigraphic evidence shows that a late-glacial ice cap existed on part of the Eastern Cordillera of Ecuador (Lat. 0° 20′ S) on ground with a mean elevation of 4200 m where none exists now. An outlet glacier from an ca. 800 km 2 ice cap terminated at 3850 m altitude in the Papallacta valley on the eastern side of the plateau. Radiocarbon dates show that moraines formed by this advance were ice-free by 13,200 14 C yr B.P. Tephras and the age of organic deposits at the plateau edge indicate ice-free conditions before 11,800 14 C yr B.P. This interval was followed by the expansion of an ca. 140 km 2 ice cap that discharged glaciers into adjacent valleys where terminal moraines were built at 3950 m altitude. AMS and conventional radiocarbon dates from macrofossils, peat, and gyttja above and below till of the readvance indicate that the ice cap formed between ca. 11,000 and 10,000 14 C yr B.P. and was thus coeval with the European Younger Dryas event. The ice cap developed in response to a surface temperature cooling of at least 3°C in the tropical Andes, a finding that is consistent with a coupled equatorial/high latitude North Atlantic climate system operating at the late-glacial/Holocene transition. These results are further evidence that Younger Dryas cooling may have been a global event. |
format |
Article in Journal/Newspaper |
author |
Clapperton, Chalmers M. Hall, Minard Mothes, Patricia Hole, Malcolm J. Still, John W. Helmens, Karin F. Kuhry, Peter Gemmell, Alastair M.D. |
spellingShingle |
Clapperton, Chalmers M. Hall, Minard Mothes, Patricia Hole, Malcolm J. Still, John W. Helmens, Karin F. Kuhry, Peter Gemmell, Alastair M.D. A Younger Dryas Icecap in the Equatorial Andes |
author_facet |
Clapperton, Chalmers M. Hall, Minard Mothes, Patricia Hole, Malcolm J. Still, John W. Helmens, Karin F. Kuhry, Peter Gemmell, Alastair M.D. |
author_sort |
Clapperton, Chalmers M. |
title |
A Younger Dryas Icecap in the Equatorial Andes |
title_short |
A Younger Dryas Icecap in the Equatorial Andes |
title_full |
A Younger Dryas Icecap in the Equatorial Andes |
title_fullStr |
A Younger Dryas Icecap in the Equatorial Andes |
title_full_unstemmed |
A Younger Dryas Icecap in the Equatorial Andes |
title_sort |
younger dryas icecap in the equatorial andes |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1006/qres.1996.1861 http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949691861X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400038515 |
genre |
Ice cap North Atlantic |
genre_facet |
Ice cap North Atlantic |
op_source |
Quaternary Research volume 47, issue 1, page 13-28 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1996.1861 |
container_title |
Quaternary Research |
container_volume |
47 |
container_issue |
1 |
container_start_page |
13 |
op_container_end_page |
28 |
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1810449307302625280 |