Cooling of Tropical Brazil (5-Degrees-C) during the Last Glacial Maximum

Publication Type  Journal Article
Year of Publication  1995
Authors  Stute, M.; Forster, M.; Frischkorn, H.; Serejo, A.; Clark, J. F.; Schlosser, P.; Broecker, W. S.; Bonani, G.
Journal Title  Science
Volume  269
Issue  5222
Pages  379-383
Journal Date  Jul 21
ISBN Number  0036-8075
Accession Number  ISI:A1995RK42700042
Key Words  quaternary glaciations; noble-gases; water; helium; paleotemperatures; groundwater; solubility; seawater; colombia; crustal

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.


Rk427Times Cited:250Cited References Count:44

URL  <Go to ISI>://A1995RK42700042