Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean
Records of mean sortable silt and planktonic foraminiferal preservation from the Ceará Rise (western equatorial Atlantic) and from the Caribbean are presented to analyze the Pliocene (3.5-2.2 Ma) to Pleistocene (1.6-0.3 Ma) evolution of near-bottom current strength and the carbonate corrosiveness of...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.736003 2024-09-15T18:12:36+00:00 Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean Gröger, Matthias Henrich, Rüdiger Bickert, Torsten MEDIAN LATITUDE: 9.103330 * MEDIAN LONGITUDE: -61.609900 * SOUTH-BOUND LATITUDE: 5.462660 * WEST-BOUND LONGITUDE: -78.739300 * NORTH-BOUND LATITUDE: 12.744000 * EAST-BOUND LONGITUDE: -44.480500 * DATE/TIME START: 1994-02-28T06:30:00 * DATE/TIME END: 1996-01-14T23:15:00 2003 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.736003 https://doi.org/10.1594/PANGAEA.736003 en eng PANGAEA Gröger, Matthias (2002): Deep-water circulation in the western equatorial Atlantic: inferences from carbonate preservation studies and silt grain-size analysis. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 195, 95 pp, urn:nbn:de:gbv:46-00103059-12 https://doi.pangaea.de/10.1594/PANGAEA.736003 https://doi.org/10.1594/PANGAEA.736003 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Gröger, Matthias; Henrich, Rüdiger; Bickert, Torsten (2003): Variability of silt grain size and planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean. Marine Geology, 201(4), 307-320, https://doi.org/10.1016/S0025-3227(03)00264-0 154-927A 165-999A Caribbean Sea DRILL Drilling/drill rig GeoB Geosciences University of Bremen Joides Resolution Leg154 Leg165 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2003 ftpangaea https://doi.org/10.1594/PANGAEA.73600310.1016/S0025-3227(03)00264-0 2024-08-21T00:02:25Z Records of mean sortable silt and planktonic foraminiferal preservation from the Ceará Rise (western equatorial Atlantic) and from the Caribbean are presented to analyze the Pliocene (3.5-2.2 Ma) to Pleistocene (1.6-0.3 Ma) evolution of near-bottom current strength and the carbonate corrosiveness of deep water. During the mid-Pleistocene climate transition (~1 Ma) a drastic decrease in glacial bottom current strength and an increase in carbonate corrosiveness is registered, demonstrating a substantial decrease in the glacial contribution of the Lower North Atlantic Deep Water (LNADW) to the Atlantic Ocean. Also, an increased sensitivity to eccentricity orbital forcing is registered after the MPT. By contrast, carbonate preservation increases considerably in the deep Caribbean in response to a strong and persistent stable contribution of Upper North Atlantic Deep Water (UNADW). We found evidence for the strongest and most stable circulation within the LNADW cell during the Northern Hemisphere cooling period between ~3.2 and 2.75 Ma. This is in agreement with the 'superconveyor model' which postulates that the highest NADW production took place prior to ~2.7 Ma. A considerable decrease in bottom current strength and planktonic foraminiferal preservation is observed synchronous with the first occurrence of large-scale continental ice sheets in the Northern Hemisphere. This documents the final termination of the 'superconveyor' at ca. 2.75 Ma. However, our data do not support a 'superconveyor' in the interval between 3.5 and 3.2 Ma when high-amplitude fluctuations in bottom current flow and preservation in planktonic foraminifera are observed. Because of the great sensitivity of NADW production to changes in surface water salinity, we assume that the high-amplitude fluctuations of LNADW circulation prior to ~3.2 Ma are linked to changes in the Atlantic salinity budget. After 2.75 Ma they are primarily controlled by ice-sheet forcing. In contrast to the stepwise deterioration of planktonic foraminiferal preservation ... Other/Unknown Material Ice Sheet NADW North Atlantic Deep Water North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-78.739300,-44.480500,12.744000,5.462660) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
154-927A 165-999A Caribbean Sea DRILL Drilling/drill rig GeoB Geosciences University of Bremen Joides Resolution Leg154 Leg165 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
154-927A 165-999A Caribbean Sea DRILL Drilling/drill rig GeoB Geosciences University of Bremen Joides Resolution Leg154 Leg165 North Atlantic Ocean Ocean Drilling Program ODP Gröger, Matthias Henrich, Rüdiger Bickert, Torsten Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
topic_facet |
154-927A 165-999A Caribbean Sea DRILL Drilling/drill rig GeoB Geosciences University of Bremen Joides Resolution Leg154 Leg165 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Records of mean sortable silt and planktonic foraminiferal preservation from the Ceará Rise (western equatorial Atlantic) and from the Caribbean are presented to analyze the Pliocene (3.5-2.2 Ma) to Pleistocene (1.6-0.3 Ma) evolution of near-bottom current strength and the carbonate corrosiveness of deep water. During the mid-Pleistocene climate transition (~1 Ma) a drastic decrease in glacial bottom current strength and an increase in carbonate corrosiveness is registered, demonstrating a substantial decrease in the glacial contribution of the Lower North Atlantic Deep Water (LNADW) to the Atlantic Ocean. Also, an increased sensitivity to eccentricity orbital forcing is registered after the MPT. By contrast, carbonate preservation increases considerably in the deep Caribbean in response to a strong and persistent stable contribution of Upper North Atlantic Deep Water (UNADW). We found evidence for the strongest and most stable circulation within the LNADW cell during the Northern Hemisphere cooling period between ~3.2 and 2.75 Ma. This is in agreement with the 'superconveyor model' which postulates that the highest NADW production took place prior to ~2.7 Ma. A considerable decrease in bottom current strength and planktonic foraminiferal preservation is observed synchronous with the first occurrence of large-scale continental ice sheets in the Northern Hemisphere. This documents the final termination of the 'superconveyor' at ca. 2.75 Ma. However, our data do not support a 'superconveyor' in the interval between 3.5 and 3.2 Ma when high-amplitude fluctuations in bottom current flow and preservation in planktonic foraminifera are observed. Because of the great sensitivity of NADW production to changes in surface water salinity, we assume that the high-amplitude fluctuations of LNADW circulation prior to ~3.2 Ma are linked to changes in the Atlantic salinity budget. After 2.75 Ma they are primarily controlled by ice-sheet forcing. In contrast to the stepwise deterioration of planktonic foraminiferal preservation ... |
format |
Other/Unknown Material |
author |
Gröger, Matthias Henrich, Rüdiger Bickert, Torsten |
author_facet |
Gröger, Matthias Henrich, Rüdiger Bickert, Torsten |
author_sort |
Gröger, Matthias |
title |
Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
title_short |
Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
title_full |
Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
title_fullStr |
Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
title_full_unstemmed |
Planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean |
title_sort |
planktonic foraminiferal preservation in plio/pleistocene sediments from the western equatorial atlantic and caribbean |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.736003 https://doi.org/10.1594/PANGAEA.736003 |
op_coverage |
MEDIAN LATITUDE: 9.103330 * MEDIAN LONGITUDE: -61.609900 * SOUTH-BOUND LATITUDE: 5.462660 * WEST-BOUND LONGITUDE: -78.739300 * NORTH-BOUND LATITUDE: 12.744000 * EAST-BOUND LONGITUDE: -44.480500 * DATE/TIME START: 1994-02-28T06:30:00 * DATE/TIME END: 1996-01-14T23:15:00 |
long_lat |
ENVELOPE(-78.739300,-44.480500,12.744000,5.462660) |
genre |
Ice Sheet NADW North Atlantic Deep Water North Atlantic Planktonic foraminifera |
genre_facet |
Ice Sheet NADW North Atlantic Deep Water North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Gröger, Matthias; Henrich, Rüdiger; Bickert, Torsten (2003): Variability of silt grain size and planktonic foraminiferal preservation in Plio/Pleistocene sediments from the western equatorial Atlantic and Caribbean. Marine Geology, 201(4), 307-320, https://doi.org/10.1016/S0025-3227(03)00264-0 |
op_relation |
Gröger, Matthias (2002): Deep-water circulation in the western equatorial Atlantic: inferences from carbonate preservation studies and silt grain-size analysis. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 195, 95 pp, urn:nbn:de:gbv:46-00103059-12 https://doi.pangaea.de/10.1594/PANGAEA.736003 https://doi.org/10.1594/PANGAEA.736003 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.73600310.1016/S0025-3227(03)00264-0 |
_version_ |
1810450184018067456 |