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Late-Glacial Cooling in Amazonia Inferred from Pollen at Lagoa do Caçó, Northern Brazil

Published online by Cambridge University Press:  20 January 2017

Marie-Pierre Ledru ,
Renato Campello Cordeiro ,
José Maria Landim Dominguez ,
Louis Martin ,
Philippe Mourguiart ,
Abdelfetah Sifeddine  and
Bruno Turcq
Marie-Pierre Ledru
Affiliation:
CNPq/IRD (ex ORSTOM), Universidade de São Paulo, Instituto de Geociências, Departamento Geologia Sedimentar e Ambiental, Caixa Postal 11348, São Paulo, SP 05422-970, Brazil, E-mail: ledru@usp.br
Renato Campello Cordeiro
Affiliation:
CNPq/IRD (ex ORSTOM), Universidade Federal Fluminense, Departamento Da Geoquı́mica, Morro de Valonguinho Outeiro, São João Batista, Niteroi, RJ 24020-007, Brazil
José Maria Landim Dominguez
Affiliation:
CNPq/IRD (ex ORSTOM), Universidade Federal da Bahia, Laboratório de Estudos Costeiros, CPGG, IGEO, Rua Caetano Moura 123, Salvador, BA 40210-340, Brazil
Louis Martin
Affiliation:
CNPq/IRD (ex ORSTOM), Universidade Federal da Bahia, Laboratório de Estudos Costeiros, CPGG, IGEO, Rua Caetano Moura 123, Salvador, BA 40210-340, Brazil
Philippe Mourguiart
Affiliation:
Institut de Recherche pour le Développement (ex ORSTOM), Université de Pau et des Pays de l'Adour, Departamento d'Ecologie, Campus Universitaire d'Anglet, Parc Montaury, 64600 Anglet, France
Abdelfetah Sifeddine
Affiliation:
CNPq/IRD (ex ORSTOM), Universidade Federal Fluminense, Departamento Da Geoquı́mica, Morro de Valonguinho Outeiro, São João Batista, Niteroi, RJ 24020-007, Brazil
Bruno Turcq
Affiliation:
Institut de Recherche pour le Développement IRD (ex ORSTOM), 32 Avenue Henri Varagnat, 93143 Bondy Cedex, France
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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.

Keywords

palynologySouth AmericaBrazillate-glacialPodocarpusAmazoniapolar advectionmeteorological equator
Type
Research Article
Information
Quaternary Research , Volume 55 , Issue 1 , January 2001 , pp. 47 - 56
Copyright
University of Washington

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