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Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil.

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Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil.

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dc.contributor.author Stríkis, Nicolás M.
dc.contributor.author Cruz, Francisco W.
dc.contributor.author Cheng, Hai.
dc.contributor.author Karmann, Ivo.
dc.contributor.author Edwards, R. Lawrence.
dc.contributor.author Vuille, Mathias.
dc.contributor.author Wang, Xianfeng.
dc.contributor.author de Paula, Marcos S.
dc.contributor.author Novello, Valdir F.
dc.contributor.author Auler, Augusto S.
dc.date.accessioned 2012-10-29T03:55:24Z
dc.date.available 2012-10-29T03:55:24Z
dc.date.copyright 2011
dc.date.issued 2012-10-29
dc.identifier.citation Strikis, N. M., Cruz, F. W., Cheng, H., Karmann, I., Edwards, R. L., Vuille, M., et al. (2011). Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil. Geology, 39(11), 1075-1078.
dc.identifier.issn 0091-7613
dc.identifier.uri http://hdl.handle.net/10220/8816
dc.description.abstract Well-dated high-resolution oxygen isotope records of speleothems in central-eastern Brazil spanning from 1.3 to 10.2 kyr B.P. reveal that the occurrence of abrupt variations in monsoon precipitation is not random. They show a striking match with Bond events and a significant pacing at ∼800 yr, a dominant periodicity present in sea surface temperature records from both the North Atlantic and equatorial Pacific Oceans that is possibly related to periods of low solar activity (high 14C based on the atmospheric Δ14C record). The precipitation variations over central-eastern Brazil are broadly antiphased with the Asian and Indian Monsoons during Bond events and show marked differences in duration and structure between the early and late Holocene. Our results suggest that these abrupt multicentennial precipitation events are primarily linked to changes in the North Atlantic meridional overturning circulation (AMOC). Anomalous cross-equatorial flow induced by negative AMOC phases may have modulated not only the monsoon in South America but also affected El Niño−like conditions in the tropical Pacific during the Holocene.
dc.language.iso en
dc.relation.ispartofseries Geology
dc.rights © 2011 Geological Society of America.
dc.subject DRNTU::Science::Geology.
dc.title Abrupt variations in South American monsoon rainfall during the Holocene based on a speleothem record from central-eastern Brazil.
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1130/G32098.1

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