Late Quaternary vegetational and climatic changes in Brazil

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The cerrado vegetation of Brazil

George Eiten (1972)

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A Long Pollen Record from Lowland Amazonia: Forest and Cooling in Glacial Times

J. Moreno, P. E. De Oliveira, P. A. Colinvaux … (1996)

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Cooling of Tropical Brazil (5 C) During the Last Glacial Maximum

M. Förster, H. Frischkorn, A. Serejo … (1995)

A 30,000-year paleotemperature record derived from noble gases dissolved in carbon-14-dated ground water indicates that the climate in lowland Brazil (Piaui Province, 7 degrees S, 41.5 degrees W; altitude, 400 meters) was 5.4 degrees +/- 0.6 degrees C cooler during the last glacial maximum than today. This result suggests a rather uniform cooling of the Americas between 40 degrees S and 40 degrees N. A 5.4 degrees C cooling of tropical South America is consistent with pollen records, snow line reconstructions, and strontium/calcium ratios and delta(18)O coral records but is inconsistent with the sea-surface temperature reconstruction of CLIMAP (Climate: Long-Range Investigation, Mapping and Prediction). On the basis of these results, it appears that the tropical Americas are characterized by a temperature sensitivity comparable to that found in higher latitudes.