highlow Atlantic native

Core/Site name:



Northeast Brasilian Margin




marine sediments (downcore)

Proxy measurement:

alkenone and elemental Ti/Ca ratios

Sampling resolution:


Climate sensitivity:

temperature, terrrestrial runoff


480 BP


62280 BP


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.

Data entered by name:

Marta M. Rufino

Data entered by email:

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Main reference(s):

Jaeschke, A et al. (2007): Determination of millennial-scale climate variability based on alkenones in the western Atlantic Ocean. doi:10.1594/PANGAEA.667499, Supplement to: Jaeschke, Andrea; Rühlemann, Carsten; Arz, Helge W; Heil, Gerrit M N; Lohmann, Gerrit (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, doi:10.1029/2006PA001391

Link to reference 1:


Data storage link 1:


Current dating method:

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Annual snow acc rate:

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Category: Ocean2k