Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1
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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.787957 2023-05-15T17:34:25+02:00 Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin MEDIAN LATITUDE: 2.943303 * MEDIAN LONGITUDE: -37.337303 * SOUTH-BOUND LATITUDE: -5.780000 * WEST-BOUND LONGITUDE: -43.670000 * NORTH-BOUND LATITUDE: 5.330000 * EAST-BOUND LONGITUDE: -9.870000 * DATE/TIME START: 1989-02-25T00:00:00 * DATE/TIME END: 1994-08-25T00:00:00 2001-08-29 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.787957 https://doi.org/10.1594/PANGAEA.787957 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.787957 https://doi.org/10.1594/PANGAEA.787957 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1029/1999PA000474 GeoB Geosciences University of Bremen SFB261 South Atlantic in Late Quaternary: Reconstruction of Budget and Currents Dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.787957 https://doi.org/10.1029/1999PA000474 2023-01-20T07:32:40Z 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. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-43.670000,-9.870000,5.330000,-5.780000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
GeoB Geosciences University of Bremen SFB261 South Atlantic in Late Quaternary: Reconstruction of Budget and Currents |
spellingShingle |
GeoB Geosciences University of Bremen SFB261 South Atlantic in Late Quaternary: Reconstruction of Budget and Currents Rühlemann, Carsten Diekmann, Bernhard Mulitza, Stefan Frank, Martin Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 |
topic_facet |
GeoB Geosciences University of Bremen SFB261 South Atlantic in Late Quaternary: Reconstruction of Budget and Currents |
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 |
Dataset |
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 |
title_short |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 |
title_full |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 |
title_fullStr |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 |
title_full_unstemmed |
Stable isotopes of foraminifers, mineralogy and ages of sediment core GeoB1523-1 |
title_sort |
stable isotopes of foraminifers, mineralogy and ages of sediment core geob1523-1 |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.787957 https://doi.org/10.1594/PANGAEA.787957 |
op_coverage |
MEDIAN LATITUDE: 2.943303 * MEDIAN LONGITUDE: -37.337303 * SOUTH-BOUND LATITUDE: -5.780000 * WEST-BOUND LONGITUDE: -43.670000 * NORTH-BOUND LATITUDE: 5.330000 * EAST-BOUND LONGITUDE: -9.870000 * DATE/TIME START: 1989-02-25T00:00:00 * DATE/TIME END: 1994-08-25T00:00:00 |
long_lat |
ENVELOPE(-43.670000,-9.870000,5.330000,-5.780000) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
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, https://doi.org/10.1029/1999PA000474 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.787957 https://doi.org/10.1594/PANGAEA.787957 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.787957 https://doi.org/10.1029/1999PA000474 |
_version_ |
1766133257524477952 |