Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil
Abstract New pollen data from a core at Lagoa do Caçó, Maranhão state, Brazil (2°58′S 43°25′W; 120 m elevation), show higher frequencies of Podocarpus at the end of the Pleistocene than today. The increase in Podocarpus , which follows the successive increase of various pioneer species such as Didym...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1006/qres.2000.2187 2024-06-23T07:46:40+00:00 Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil Ledru, Marie-Pierre Cordeiro, Renato Campello Dominguez, José Maria Landim Martin, Louis Mourguiart, Philippe Sifeddine, Abdelfetah Turcq, Bruno 2001 http://dx.doi.org/10.1006/qres.2000.2187 http://api.elsevier.com/content/article/PII:S0033589400921872?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589400921872?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400028179 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 55, issue 1, page 47-56 ISSN 0033-5894 1096-0287 journal-article 2001 crcambridgeupr https://doi.org/10.1006/qres.2000.2187 2024-06-05T04:03:41Z Abstract New pollen data from a core at Lagoa do Caçó, Maranhão state, Brazil (2°58′S 43°25′W; 120 m elevation), show higher frequencies of Podocarpus at the end of the Pleistocene than today. The increase in Podocarpus , which follows the successive increase of various pioneer species such as Didymopanax , Melastomataceae/Combretaceae, and Cecropia , implies a progressive late-glacial increase of moist and cool climatic conditions. A comparable increase in Podocarpus is found in other lowland records in Amazonia. A review of published pollen data from Amazonia suggests that the moisture source was from the southeast. By contrast, present-day moisture comes from the tropical Atlantic and from the Amazon basin, with its convective precipitation. The likely cause for the southeastern moisture source between ca. 15,000 and 14,500 cal yr B.P. was enhanced polar (Antarctic) advection that reached low latitudes and maintained year-round the meteorological equator in its austral-winter position at northern latitudes or reduced drastically its southward summer displacement. This hypothesis is consistent with marine and ice core records. Article in Journal/Newspaper Antarc* Antarctic ice core Cambridge University Press Antarctic Austral Quaternary Research 55 1 47 56 |
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Cambridge University Press |
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crcambridgeupr |
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English |
description |
Abstract New pollen data from a core at Lagoa do Caçó, Maranhão state, Brazil (2°58′S 43°25′W; 120 m elevation), show higher frequencies of Podocarpus at the end of the Pleistocene than today. The increase in Podocarpus , which follows the successive increase of various pioneer species such as Didymopanax , Melastomataceae/Combretaceae, and Cecropia , implies a progressive late-glacial increase of moist and cool climatic conditions. A comparable increase in Podocarpus is found in other lowland records in Amazonia. A review of published pollen data from Amazonia suggests that the moisture source was from the southeast. By contrast, present-day moisture comes from the tropical Atlantic and from the Amazon basin, with its convective precipitation. The likely cause for the southeastern moisture source between ca. 15,000 and 14,500 cal yr B.P. was enhanced polar (Antarctic) advection that reached low latitudes and maintained year-round the meteorological equator in its austral-winter position at northern latitudes or reduced drastically its southward summer displacement. This hypothesis is consistent with marine and ice core records. |
format |
Article in Journal/Newspaper |
author |
Ledru, Marie-Pierre Cordeiro, Renato Campello Dominguez, José Maria Landim Martin, Louis Mourguiart, Philippe Sifeddine, Abdelfetah Turcq, Bruno |
spellingShingle |
Ledru, Marie-Pierre Cordeiro, Renato Campello Dominguez, José Maria Landim Martin, Louis Mourguiart, Philippe Sifeddine, Abdelfetah Turcq, Bruno Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
author_facet |
Ledru, Marie-Pierre Cordeiro, Renato Campello Dominguez, José Maria Landim Martin, Louis Mourguiart, Philippe Sifeddine, Abdelfetah Turcq, Bruno |
author_sort |
Ledru, Marie-Pierre |
title |
Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
title_short |
Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
title_full |
Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
title_fullStr |
Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
title_full_unstemmed |
Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil |
title_sort |
late-glacial cooling in amazonia inferred from pollen at lagoa do caçó, northern brazil |
publisher |
Cambridge University Press (CUP) |
publishDate |
2001 |
url |
http://dx.doi.org/10.1006/qres.2000.2187 http://api.elsevier.com/content/article/PII:S0033589400921872?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589400921872?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400028179 |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Quaternary Research volume 55, issue 1, page 47-56 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.2000.2187 |
container_title |
Quaternary Research |
container_volume |
55 |
container_issue |
1 |
container_start_page |
47 |
op_container_end_page |
56 |
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1802647391703138304 |