Timing and structure of the 8.2. kyr B.P. event inferred from δ 18O records of stalagmites from China, Oman, and Brazil

Hai Cheng, Dominik Fleitmann, R. Lawrence Edwards, Xianfeng Wang, Francisco W. Cruz, Augusto S. Auler, Augusto Mangini, Yongjin Wang, Xinggong Kong, Stephen J. Burns, Albert Matter

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195 Scopus citations

Abstract

Oxygen isotope records of stalagmites from China and Oman reveal a weak summer monsoon event, with a double-plunging structure, that started 8.21 ± 0.02 kyr B.P. An identical but antiphased pattern is also evident in two stalagmite records from eastern Brazil, indicating that the South American Summer Monsoon was intensified during the 8.2 kyr B.P. event. These records demonstrate that the event was of global extent and synchronous within dating errors of <50 years. In comparison with recent model simulations, it is plausible that the 8.2 kyr B.P. event can be tied in changes of the Atlantic Meridional Overturning Circulation triggered by a glacial lake draining event. This, in turn, affected North Atlantic climate and latitudinal position of the Intertropical Convergence Zone, resulting in the observed low-latitude monsoonal precipitation patterns.

Original languageEnglish (US)
Pages (from-to)1007-1010
Number of pages4
JournalGeology
Volume37
Issue number11
DOIs
StatePublished - 2009

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