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  Coupling of millennial-scale changes in sea surface temperature and precipitation off northeastern Brazil with high-latitude climate shifts during the last glacial period

Jaeschke, A., Rühlemann, C., Arz, H. W., Heil, G., Lohmann, G. (2007): Coupling of millennial-scale changes in sea surface temperature and precipitation off northeastern Brazil with high-latitude climate shifts during the last glacial period. - Paleoceanography, 22, PA4206.
https://doi.org/10.1029/2006PA001391

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_236038 Versions-Permalink: -
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Jaeschke, A.1, Autor
Rühlemann, C.1, Autor
Arz, H. W.1, Autor
Heil, G.1, Autor
Lohmann, G.1, Autor
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, Autor              
Affiliations:
1External Organizations, ou_persistent22              

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Schlagwörter: sea surface temperatures; millennial-scale climate variability; climate models
 DDC: 550 - Earth sciences
 Zusammenfassung: High-resolution records of alkenone-derived sea surface temperatures and elemental Ti/Ca ratios from a sediment core retrieved off northeastern Brazil (4°S) reveal short-term climate variability throughout the past 63,000 a. Large pulses of terrigenous sediment discharge, caused by increased precipitation in the Brazilian hinterland, coincide with Heinrich events and the Younger Dryas period. Terrigenous input maxima related to Heinrich events H6–H2 are characterized by rapid cooling of surface water ranging between 0.5° and 2°C. This signature is consistent with a climate model experiment where a reduction of the Atlantic meridional overturning circulation (AMOC) and related North Atlantic cooling causes intensification of NE trade winds and a southward movement of the Intertropical Convergence Zone, resulting in enhanced precipitation off northeastern Brazil. During deglaciation the surface temperature evolution at the core site predominantly followed the Antarctic warming trend, including a cooling, prior to the Younger Dryas period. An abrupt temperature rise preceding the onset of the Bølling/Allerød transition agrees with model experiments suggesting a Southern Hemisphere origin for the abrupt resumption of the AMOC during deglaciation caused by Southern Ocean warming and associated with northward flow anomalies of the South Atlantic western boundary current.

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 Datum: 2007
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: eDoc: 10451
GFZPOF: 3.0 Klimavariabilität und Lebensraum des Menschen
DOI: 10.1029/2006PA001391
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Titel: Paleoceanography
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 22 (PA4206) Artikelnummer: - Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals377