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Paleoclimate Changes during the last 100,000 yr from a Record in the Brazilian Atlantic Rainforest region and Interhemispheric Comparison

Published online by Cambridge University Press:  20 January 2017

M.-P. Ledru ,
D.-D. Rousseau ,
F.W. Cruz Jr. ,
C. Riccomini ,
I. Karmann  and
L. Martin
M.-P. Ledru
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, 05508-900 São Paulo-SP, Brazil ISEM/Paléoenvironnements, CNRS UMR 5554, Université de Montpellier 2, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
D.-D. Rousseau
Affiliation:
ISEM/Paléoenvironnements, CNRS UMR 5554, Université de Montpellier 2, Place Eugène Bataillon, 34095 Montpellier cedex 5, France
F.W. Cruz Jr.
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, 05508-900 São Paulo-SP, Brazil Department of Geosciences, University of Massachusetts, Amherst, MA 01002, USA
C. Riccomini
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, 05508-900 São Paulo-SP, Brazil
I. Karmann
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, 05508-900 São Paulo-SP, Brazil
L. Martin
Affiliation:
Institut de Recherche pour le Développement, 32 av. Henri Varagnat, 93143 Bondy cedex, France
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Abstract

A long terrestrial record, Colônia CO-3, from the Atlantic rainforest region in Brazil (23°52′S, 46°42′20 ʺW, 900 m a.s.l.) registrates variations in the forest expansion during the last 100,000 yr. The 780-cm depth core was analyzed at 2-cm intervals and arboreal pollen frequencies were compared to nearby speleothem stable isotope records and neighboring marine records from the tropical Atlantic. To evaluate regional versus global climate forcing, our record was compared with Greenland and Antarctic ice-core records. These comparisons suggest that changes in temperature seen in polar latitudes relate to moisture changes: e.g., to changes in the length of the dry season, in tropical and subtropical latitudes during glacial as well as interglacial times. These climatic changes result from changes in the frequency of polar air incursions to these latitudes inducing a permanent cloud cover and precipitation. This is an important result that should help define paleoclimatic features in the Southern Hemisphere for the last glaciation.

Keywords

Southern HemisphereTropicsPaleoclimatologyPalynologyRainforestLong recordInterhemispheric comparison
Type
Short Papers
Information
Quaternary Research , Volume 64 , Issue 3 , November 2005 , pp. 444 - 450
Copyright
University of Washington

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