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Millennial‐scale precipitation changes in southern Brazil over the past 90,000 years
Author(s) -
Wang Xianfeng,
Auler Augusto S.,
Edwards R. L.,
Cheng Hai,
Ito Emi,
Wang Yongjin,
Kong Xinggong,
Solheid Maniko
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031149
Subject(s) - speleothem , intertropical convergence zone , stalagmite , climatology , hadley cell , geology , cave , precipitation , walker circulation , before present , isotopes of oxygen , climate change , oceanography , holocene , geography , el niño southern oscillation , general circulation model , archaeology , geochemistry , meteorology
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.