Millennial-scale precipitation changes in southern Brazil over the past 90,000 years
Article first published online: 4 DEC 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 23, December 2007
How to Cite
2007), Millennial-scale precipitation changes in southern Brazil over the past 90,000 years, Geophys. Res. Lett., 34, L23701, doi:10.1029/2007GL031149., , , , , , , and (
- Issue published online: 4 DEC 2007
- Article first published online: 4 DEC 2007
- Manuscript Accepted: 22 OCT 2007
- Manuscript Revised: 23 SEP 2007
- Manuscript Received: 27 JUN 2007
- millennial timescale;
- southern Brazil;
 A U-Th dated 90,000 year-long speleothem oxygen isotope record from southern Brazil anti-correlates remarkably with the cave calcite records from eastern China, but positively correlates with the speleothem record from northeastern Brazil, suggesting an interhemispheric anti-phasing of rainfall on both millennial and orbital timescales, likely related to displacement in the mean position of the intertropical convergence zone and associated asymmetry in Hadley circulation. The phase relationships among these records are consistent with the hypothesis that abrupt climate events during the last glacial period are triggered by oceanic circulation changes in the high latitudes and enhanced by tropical feedbacks.