Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305
Today the western tropical Atlantic is the most important passage for cross-equatorial transfer of heat in the form of warm surface water flowing from the South into the North Atlantic. Circulation changes north of South America may thus have influenced the global thermohaline circulation system and...
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ftdatacite:10.1594/pangaea.787957 2023-05-15T17:34:23+02:00 Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin 2001 application/zip https://dx.doi.org/10.1594/pangaea.787957 https://doi.pangaea.de/10.1594/PANGAEA.787957 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/1999pa000474 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Geosciences, University of Bremen GeoB South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261 Collection article Supplementary Collection of Datasets 2001 ftdatacite https://doi.org/10.1594/pangaea.787957 https://doi.org/10.1029/1999pa000474 2021-11-05T12:55:41Z Today the western tropical Atlantic is the most important passage for cross-equatorial transfer of heat in the form of warm surface water flowing from the South into the North Atlantic. Circulation changes north of South America may thus have influenced the global thermohaline circulation system and high northern latitude climate. Here we reconstruct late Quaternary variations of western equatorial Atlantic surface circulation and Amazon lowland climate obtained from a multiproxy sediment record from Ceará Rise. Variations in the illite/smectite ratio suggest drier climatic conditions in the Amazon Basin during glacials relative to interglacials. The 230Thex-normalized fluxes and the 13C/12C record of organic carbon indicate that sea level fluctuations, shelf topography, and changes of the surface circulation pattern controlled variations and amplitude of terrigenous sediment supply to the Ceará Rise. We attribute variations in thermocline depth, reconstructed from vertical planktic foraminiferal oxygen isotope gradients and abundances of the phytoplankton species Florisphaera profunda, to changes in southeast trade wind intensity. Strong trade winds during ice volume maxima are associated with a deep western tropical Atlantic thermocline, strengthening of the North Brazil Current retroflection, and more vigorous eastward flow of surface waters. Article in Journal/Newspaper North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Geosciences, University of Bremen GeoB South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261 |
spellingShingle |
Geosciences, University of Bremen GeoB South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261 Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
topic_facet |
Geosciences, University of Bremen GeoB South Atlantic in Late Quaternary Reconstruction of Budget and Currents SFB261 |
description |
Today the western tropical Atlantic is the most important passage for cross-equatorial transfer of heat in the form of warm surface water flowing from the South into the North Atlantic. Circulation changes north of South America may thus have influenced the global thermohaline circulation system and high northern latitude climate. Here we reconstruct late Quaternary variations of western equatorial Atlantic surface circulation and Amazon lowland climate obtained from a multiproxy sediment record from Ceará Rise. Variations in the illite/smectite ratio suggest drier climatic conditions in the Amazon Basin during glacials relative to interglacials. The 230Thex-normalized fluxes and the 13C/12C record of organic carbon indicate that sea level fluctuations, shelf topography, and changes of the surface circulation pattern controlled variations and amplitude of terrigenous sediment supply to the Ceará Rise. We attribute variations in thermocline depth, reconstructed from vertical planktic foraminiferal oxygen isotope gradients and abundances of the phytoplankton species Florisphaera profunda, to changes in southeast trade wind intensity. Strong trade winds during ice volume maxima are associated with a deep western tropical Atlantic thermocline, strengthening of the North Brazil Current retroflection, and more vigorous eastward flow of surface waters. |
format |
Article in Journal/Newspaper |
author |
Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin |
author_facet |
Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin |
author_sort |
Rühlemann, Carsten |
title |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
title_short |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
title_full |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
title_fullStr |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
title_full_unstemmed |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1, supplement to: Rühlemann, Carsten; Diekmann, Bernhard; Mulitza, Stefan; Frank, Martin (2001): Late Quaternary changes of western equatorial Atlantic surface circulation and Amazon lowland climate recorded in Ceara Rise deep-sea sediments. Paleoceanography, 16(3), 293-305 |
title_sort |
stable isotopes of foraminifers, mineralogy and ages of sediment core geob1523-1, supplement to: rühlemann, carsten; diekmann, bernhard; mulitza, stefan; frank, martin (2001): late quaternary changes of western equatorial atlantic surface circulation and amazon lowland climate recorded in ceara rise deep-sea sediments. paleoceanography, 16(3), 293-305 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2001 |
url |
https://dx.doi.org/10.1594/pangaea.787957 https://doi.pangaea.de/10.1594/PANGAEA.787957 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1029/1999pa000474 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.787957 https://doi.org/10.1029/1999pa000474 |
_version_ |
1766133194728407040 |