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Astronomical Forcing of Contrasting Rainfall Changes in Tropical South America between 12,400 and 8800 cal yr B.P.

Published online by Cambridge University Press:  20 January 2017

Louis Martin ,
Jacques Bertaux ,
Thierry Corrège ,
Marie-Pierre Ledru ,
Philippe Mourguiart ,
Abdelfettah Sifeddine ,
François Soubiès ,
Denis Wirrmann ,
Kenitiro Suguio  and
Bruno Turcq
Louis Martin
Affiliation:
ORSTOM, PPPG, IG/UFBA, Rua Caetano Moura 123, 40170-010, Salvador, Brazil
Jacques Bertaux
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
Thierry Corrège
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
Marie-Pierre Ledru
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
Philippe Mourguiart
Affiliation:
ORSTOM, CP 9214, 00095, La Paz, Bolivia
Abdelfettah Sifeddine
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
François Soubiès
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
Denis Wirrmann
Affiliation:
ORSTOM, 32 Av. Henri Varagnat, 93 143, Bondy, France
Kenitiro Suguio
Affiliation:
Instituto de Geociências, Universidade de São Paulo, CP 11.348, 05422-970, São Paulo, Brazil
Bruno Turcq
Affiliation:
ORSTOM, Instituto de Quı́mica, Universidade Federal Fluminense, 240 20007, Niteroi, Brazil
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Abstract

Today, precipitation over tropical South America is largely controlled by the seasonal movements of the Inter-Tropical Convergence Zone (ITCZ). During the summer, the ITCZ is shifted southward due to the warming of the continent. Paleoclimate data from southeastern Amazonia and the central Andes indicate that these two areas evolved similarly during the last 30,000 yr. However, between 12,400 and 8800 cal yr B.P., eastern Amazonia received substantial moisture whereas the Bolivian Altiplano was arid. This suggests that the ITCZ during summer was then farther north than it is today.

Type
Research Article
Information
Quaternary Research , Volume 47 , Issue 1 , January 1997 , pp. 117 - 122
Copyright
University of Washington

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